Axial Wall
Axial Wall
Designing And Building A Home Recording Studio With Studio Design 2010
Recording instruments and mixing tracks are different tasks and require balanced room acoustics. Instruments and drums produce a range of frequencies which are represented as musical notes. Think about the bass guitar and kick drum. They are low freq. instruments. The lowest note on a 5-string bass guitar is the low B at 31 hertz and a kick drum at 25 – 40 hz.
The wavelength of 31 hz is C/f = 1128.6/31 = 36.4 feet
The wavelength of 25 hz is C/f = 1128.6/25 = 45.1 feet
A wall will resonate at a given frequency when a sound wave acts upon it that shares the same frequency or is a harmonic of it. This is calculated in relation to dimension as f = C/2L.
Therefore a wavelength of 25 hz needs a wall of minimum length of L = C/2f = 22.6 feet to avoid this effect and to support low frequencies being recorded properly. That being said, larger rooms support higher reverb times that tend to give smooth low frequency response. Try to build your studio with at least 1 dimension that will support the lowest frequency to be recorded. Also, avoid equal dimensions or multiples of a dimension as these will cause modal build-ups of 200% to 300% of normal amplitudes.
A enclosed rectangular room is subject to standing waves which comprise a fundamental frequency and harmonics or nodes which are calculated for each room dimension up to the room low cut-off frequency. If the room dimensions are not spaced well or too small, then modal build-ups will occur. As an example, if a bass player hits the open low B string of 31 hz in a room that is 16′ x 13′ x 10′, then all surfaces in that room that resonate at 31 hz or its harmonics will vibrate because the minimum length of 18.2′ is just 16′. Therefore, the natural wavelength of the note cannot resolve and the sound energy will bounce around. The drum set will vibrate most likely as will the walls and if mics are live, they may feedback.
The room cut-off frequency (Lco) is very important to know to deal with troublesome mode build-up. It is related to room volume and reverb response. Modes (frequencies) above the Lco are handled by the room with a smooth response while modes below the Lco are of concern if they cause a build-up.
Lco = 20,000 * Sqr (Reverb Time / Room Volume) in hertz
Studio Design 2010 allows the user to enter in room dimensions of length, width, height and the reverb response for the room. It calculates all the modal frequencies for axial, tangial, and oblique modes and graphs the results for easy to see modal spacing and mode buildups.
Vist www.recording-studio-design-software.com for details, examples, and instructions on using this program.
Each room dimension is calculated as wavelength (fundamental frequency) and harmonics up to the Low Cutoff Frequency for the room. The number of modes and its color is shown in the text field next to each dimension. This makes it easy to see which dimension(s) are causing a mode buildup. Simply change a dimension to see how it effects the modal spacing to optimize your studio room. Enter your room dimensions for a rectangular room and the desired reverb response (RT60) you want the room to have. Press the calculate button to see your results.
Bandwidth is the range of frequency around the fundamental frequency (and harmonics)
that is depicted as a bell curve. If one mode bandwidth is within the mode bandwidth of
another mode, it excites that mode to the extent it overlaps the mode. This extra energy
is added to the excited mode. The graph will show all excited modes in blue.
BW = 2.2 / Reverb Time
Room Volume is Length x Width x Height in cubic feet.
The Ratio calculator converts the dimensions into a ratio where 1 equals the Height. This is useful when you have dimensions that provide good modal spacing and wish to resize the room using the same ratio. Enter a value in the ft. text field and select which wall to apply the change to. Press either the up or down button to recalculate the dimensions by the entered amount. Press the Apply Ratio button to update the project with the new dimensions.
The actual modal frequencies plotted are displayed in the listbox next to each graph. The modes for Length, Width, and Height are plotted as separate colors for easy identification when deciding which dimension to tweak to optimize modal separation or reduce modal build ups. The graph is plotted up to the Low cut-off frequency for the room. They are the modes of interest. Each dimension (fundamental and harmonic frequencies) are calculated up to the Lco.
The maximum “amplitude” is 300% which represents adding 3 modes of equal frequency which only occurs when all three dimensions are the same.
The Axial modal frequencies are given an amplitude of 100%. Tangial modal frequencies are given an amplitude of 50% and the Oblique modal frequencies are given an amplitude of 25%. The All modes frequency distribution graph plots all three modes together. The graph will show all excited modes in blue if their “amplitude” is over 100%. Axial modes are considered primary, while tangial modes have a second order effect and oblique modes have a third order effect. The tangial and oblique modes tend to “fill” in between the axial
modes.
The objective is to enter your room dimensions and desired reverb response then observe the graphs for mode spacing. Start by looking at the axial graph first. The modes for length are shown in green, width in burgendy, and height in tan.
If modes are shown too close to each other they will appear in blue. Blue is a problem and means a mode build-up will occur at those resonant frequencies. Walls, ceilings and floors are essentially resonating panel absorbers which have front and back panels, air space cavity, insulation, etc. They have a resonating frequency with harmonics related to its longest dimension and will resonate when the modes under the Lco are excited.
The goal is to get the best spacing possible while minizing modal build-ups and to identify those problem modal frequencies. Coefficients of absorbtion are measured for materials at 125hz, 250hz, 500hz, 1000hz, 2000hz, 4000hz. Example: If your Lco is 300hz then check for build-ups at 125hz and 250hz. Other hot spots can be dealt with by designing custom helmoltz resonators/absorbers for those frequencies. Studio Design 2010 allows the user to design helmotz resonators and save them into the acoustic materials database and then select them into the acoustic room design.
When the room dimensions are optimized, save the project and room name. Click the materials option button to begin adding acoustic materials representing your desired construction and materials you want to use. Studio Design 2010 has a database of more than 1100 acoustic materials and their respective coefficients of absorbtion. Even better, the user can maintain, edit, add, or delete acoustic materials from this database using the Acoustic Materials menu option.
The objective is to add materials one at a time into the grid and enter the area in sq.ft. for that material. Pressing the calc button will update the absorbtion calculations for Sabines and Reverb Time. By watching the Reverb results under each frequency of 125hz, 250hz, 500hz, 1000hz, 2000hz, 4000hz you will see the effect of adding the material.
Begin by adding walls, ceiling, and floor materials you will be using and enter the area for each entry. This gives you a baseline to start from. You can then add in other elements like bass traps, helmotz resonators, etc until your reverb totals are at the design reverb time. Selecting a category filters the “Select an Acoustic Material” list. For example, select
Walls to see all walls or further filter the list by type.
Use an SPL meter inside your space to baseline the road and ambient noise from outside to determine which frequencies are getting through and the amount of noise reduction required. This can be used to choose your wall construction. Walls are rated by STC (sound transmission class). If you need a 40 db reduction then choose as wall design with STC 40 vs STC 60. The cost of STC 60 walls (Double 2×4 walls with 2 layers 5/8″ drywall both sides filled with bat insulation) can be expensive.
Select type to filter by frequency band of absorbtion such as low, low mid, mid, mid high, high, or wide. When selecting a material from the drop down list, look at the coefficients as well as the current sabine and reverb totals, to pick a material targeted for the current results.
After selecting a type, the categories list will update to reflect records assigned to that type. Example: User selects Carpets and can search through all carpets to find one representing theirs, or filter by type to find carpets that have a specific band pattern. Refer to the reverb results. If the reverb time is higher at 2000hz and 4000hz then select a band type with emphasis in the high band. The material list will update and show materials that have coefficients of absorbtion with higher values in that range.
Use the acoustic materials sabine analysis to model your current studio, control, listening room or home theater. If its not in the materials database, then find it on the web and simply add it using the Acoustic Materials screen.
After a material selection has been made, enter the area into the white text field in Sq. ft. and press the calc button. A handy calculator is a click away. Click the calculator icon and it appears. It only multiplies but it does provide floor and wall areas calculated with the dimensions that are currently entered. Look over the different wall constructions and their COA’s. Walls really do absorb low frequencies! A common construction is 2 X 6 walls with 5/8″ drywall spaced 24″ on center filled with 5.5 inches of insulation.
Studio Design 2010 provides the ability to design perforated and slat-type helmotz and panel type absorbers and resonators by clicking the Absorber Design menu option. To address troublesome modes, design helmotz resonators tuned to these frequencies.
After designing low frequency helmotz absorbers, add them into the acoustic materials database, then select them from the materials pulldown list and add them into the design grid.
In addition to perforated absorbers, use slat-type and panel absorbers to give your studio a custom look. Build wall mount panels that can open and close with a hard reflective surface on one side and absorber on the other to allow altering the rooms reverb response. Distribute absorption and diffusors equally on all walls.
Use a reflective floor with carpet in some areas to reduce reflection.
Place low frequency helmholtz perforated absorbers into your ceiling’s construction. Alternate the different designs across the ceiling. For example, a typical new construction garage has 2×8 rafters overhead. If there is a second story, it also has a subfloor also, consider that the back of a panel. If there is no second floor, put down 5/8″ plywood. Fill the ceiling joists with bat insulation. A 2×8 is 7.5″ deep. Apply 3/4″ strapping across the ceiling joists to give some decoupling or use resilent channel. This gives an air gap filled with insulation of 8.25″. Cover the ceiling with 2 layers of 1/2″ plywood. Predrill the 4×8 sheets with the perforation patterns of the helmoltz resonators in the design then screw them to the strapping. Stain or paint them and cover them with a loose-weave fabric using a spray adhesive on the plywood. Use a panel thickness of 1″, air gap of 8.25″, hole diameter of .25″ – .375″ for the helmoltz designs to acheive the desired range of frequencies. Note, that not all ceiling panels need be perforated.
Diffusion is also required to breakup various direct, indirect, and random sources. Consider triangular panel wall mounts or QRD diffusors. Studio Design 2010 allows you to design qrd’s up to 43 periods. Place them in area’s that microphones will be recording, near drum kits, vocal booths, acoustic paino’s etc. to help distribute all sound sources evenly within the recording or mixing area.
Please visit www.recording-studio-design-software.com for more information.
About the Author
D. Curtis Bates is an electrical engineer and software developer and has been a lead guitarist and songwriter for 40 years. In addition, Mr. Bates founded an independant record company and engineered and produced The Rustic Overtones in 1991 and Howie Day in 1998.
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Liebert FOUNDATION Hinge Body – Wall mount cabinet – with UPStation GXT2-1500 and MicroPOD and Ethernet OpenCommsWEBCARD and Low Noise Single Axial Fan and External Battery GXT2-1500RT120 7MIN-FULL 4RCPTL RACK-TWR Manufacturer Part Number 202637G206 GXT2-1500RT120 7MIN-FULL 4RCPTL RACK-TWR Liebert GXT2 UPS combines low cost of ownership with rich functionality, small size and high capacity. This true on-line UPS offers internal batteries, unlimited extended external batteries, and internal bypass capability, resulting in continuous uptime for the connected equipment…. |
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Axial Images
Axial Images
Endometriosis Part 27 – What is Computed Axial Tomograghy (ct Scanning or Cat) ??
As we mentioned in previous articles during the last stage of the menstrual cycle normally a layer of endometriosis lining in the inside of the uterus is expelled, known as menstruation blood but instead some of the endometriosis tissues grow somewhere in the body causing endometriosis. Endometriosis also reacts to hormonal signals of the monthly menstrual cycle, building up tissue, breaking it, and eliminating it through the menstrual period. In this article, we will discuss what is computed axial tomograghy (CT scanning or CAT) in endometriosis ?
I. Definition
CT scanning is a X ray medical instrument that generates a three dimensional image of an object from a large series of two-dimensional X ray that rotate around a single axis.
II. Procedure
Normally, you are allowed to have your clothes on and is advised not to eat any solid food for 6 hours before the exam
CT scanning is a safe, painless and little risk to patient taken it. As you lie on your back, a, X ray tube rotates around your body in a circle and taking multiple images and transferring these images of data to be reformatted in various planes or even as volumetric (3D) representations of structures. CT scanning is valuable to look at soft tissues, bone, blood vessels and provide information about size or shape of any abdominal abnormality such as endometrial adhesion, implants, tumors, fibroid, etc.
III. Risk
Some researchers say there are no risk because of minimum exposure for radiation, but the American Cancer Society’s director of screening estimate that 2 percent of future cancers may be due to CT scanning.
a) Radiation exposure
b) Cancer
I hope this information will help. If you need more information or insurance advices, please follow my article series of the above subject at my home page at:
http://medicaladvisorjournals.blogspot.com
http://lifeanddisabitityinsuranceunderwriter.blogspot.com/
About the Author
All rights reserved. Any reproducing of this article must have the author name and all the links intact.
“Let Take Care Your Health, Your Health Will Take Care You” Kyle J. Norton
I have been studying natural remedies for disease prevention for over 20 years and working as a financial consultant since 1990. Master degree in Mathematics, teaching and tutoring math at colleges and universities before joining insurance industries.
Abdomen: Liver: Cirrhosis: Axial: Axial images of a cirrhotic liver with collaterals
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Cen Racing Trucks
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CEN Racing GST Nitro Monster Truck Drifting Video
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Mattel Hot Birds
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Why Hot Wheels Has Become a Collector’s Item for Many Adults
Hot Wheels is a brand of die-cast toy cars that was launched in America by an American toy manufacturer named Mattel in the year 1968. A Die-cast toy is any toy or collectible item manufactured utilizing the die casting method. These toys are made using metal and plastic. The metal most commonly used is ZAMAK, which is an alloy of zinc and aluminum. Initially, these cars were designed to on a 1:64 scale and were used on Hot Wheels track sets. However, in 1970 a series of Hot Wheels cars were designed on a 1:43 scale. This new range of cars became adult collector series vehicles that were replicas of Formula One and NASCAR cars, which were extremely successful. The Hot Wheels logo was designed by Rick irons, a Californian Artist who worked with Mattel.
Elliot Hander, co-founder of Mattel, wanted to manufacture a range of die-cast toys for boys. He wanted to dominate the toy cars industry which was once upon a time dominated by Lesney, a British company with their Matchbox cars. Even though, Hander’s executives thought it was an awful idea, the toy cars became a major success. In 1968, Mattel released nearly sixteen castings. Eleven cars were designed by Marry Bentley Bradley. The first one manufactured was an elegant dark blue Custom Camaro.
In 1968, Hot Wheels introduced the custom-built Volkswagen, which was one their first cars. Some of the other cars they released in the same year were: Beatnik Bandit which was designed by Ed Roth, Custom Barracuda, Custom Camaro, Custom Corvette, Custom Cougar, Custom Eldorado, Custom Firebird, Custom Fleetside, Custom Mustang, Custom T-Bird, Custom Volkswagen which was designed by Ira Gilford, Deora, Ford J-Car, Hot Heap, Python which was designed by Dean Jefferies, and Silhouette. All these cars had colourful paint work, bearings, redline wheels, and working suspensions.
In 1969, Twin Mill was one of the most popular and accepted Hot Wheel cars. In 1970, the famous Sizzler, the rechargeable electronic car was made. In 1985, the Hot Wheels Torino Tornado was one of the most renowned cars. In 1995, the Hot Wheel cars were differentiated into specialized series i.e. the Model Series which was later renamed First Edition, and the Treasure Hunt Series. In 2000, a new range of Hot Wheel Cars came into the market. These cars had exquisite paint jobs, and functioned like their original counterparts.
Over the years, Hot Wheel cars have not only been collected by children, but it has become a collector’s item for many adults too. There have been estimates that over 41 million children have collected Hot Wheels toys throughout their childhood years, and an average collector has over 1,550 cars to his collection.
The Hot Wheel range of toys include many different kinds of tracks, accessories, different kinds of vehicles like the ‘Sizzlers’ the rechargeable electric cars, ‘Hot Line’ trains, ‘R-R-Rumblers’ motorcycles, and ‘Hot Birds’ aeroplanes, but they have always been most popular and well known for their collection of small scale free-rolling models of custom hot rods and muscles.
About the Author
Muna wa Wanjiru Has Been Researching and Reporting on Aloy Wheels for Years. For More Information on Hot Wheels, Visit His Site at HOT WHEELS
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Axial Bearings
Axial Bearings
DIY Turntable
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Axial Ax10 Parts List
Axial Ax10 Parts List
Mattel M16
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Yahtzee $6.34 It’s America’s all-time number one dice game! Since 1956 players have been rolling classic dice combinations like Full House, Large Straight and Five of a Kind – that’s Yahtzee! The unique combination of luck and strategy makes every game an exciting challenge. Can you rack up bonus points by scoring an extra Yahtzee’ It’s classic shake-and-score action that keeps the fun rolling! For 1 or more pl… |
Mattel Ken Doll History
Mattel Ken Doll History
The History of the Barbie Doll
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Harley Barbie – Harley Davidson Barbie Doll 1st in Series – Blonde Barbie $299.00 Barbie doll and Harley-Davidson. Who would have guessed they’d make a perfect match? She’s a vision of black faux leather, blonde hair and “silver” studs, Harley-Davidson Barbie doll represents today’s free-spirited woman. Her jacket and backpack proudly display the Harley-Davidson logo. She also has “silver” hoop earrings, black boots, sunglasses and helmet. Harley-Davidson motorcycles are famous… |
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The Ultimate Barbie Doll Book $39.95 Complete descriptions, values, model numbers, dates, and markings for more than 1,000 dolls will assist in identification of these highly sought-after dolls. Barbie and all her friends made from 1959 through 1995 are depicted in 1,800 full-color photographs…. |
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Barbie Doll Fashion 1975-1979 $8.97 Sarah Eames’s Barbie® doll fashion books have become standards in the Barbie® collecting world. Her third volume in the series will be no exception. With no repeats from her other two volumes, Barbie® Doll Fashion, Volume III features more than 600 full-color photographs of fashions, detailed descriptions, and current values. Fashions for Ken doll, family, and friends are also included: Skipper… |
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Barbie and Ruth: The Story of the World’s Most Famous Doll and the Woman Who Created Her $1.00 The tragic and redeeming story of how one visionary woman built the biggest toy company in the world and created a global icon. Barbie and Ruth is the entwined story of two exceptional women. There’s Barbie: the diminutive yet arrestingly voluptuous doll unveiled at the 1959 Toy Fair who became the treasure of 90 percent of American girls and their counterparts in 150 countries. She went on t… |
Mattel Mindflex Game
Mattel Mindflex Game
Hot Kids Toys For Christmas 2009
Are you looking for the hottest kids toys for this Christmas? The holiday shopping season is in full swing and already the hot kids toys for Christmas are sold out in the stores. Don’t panic because these very same toys that you can’t find in the stores are still readily available online. This will only be true though if you don’t wait any longer and get your order in now.
So what toys are we actually talking about? The Fashionista Barbies were the first toy reported to be flying off the shelves. Fashionista’s are adorable dolls that are very fashion conscious. Each doll has their own style and personality which is displayed with their clothing and accessories. For example, the Sassy Doll is a very trendy rock and roller with pink streaks in her hair, short boots, and a rock and roll inspired outfit to match. Each doll comes with its own fashion accessory (like a purse). This is such a fun gift for girls that you won’t want to pass it up.
The Zhu Zhu Hamster’s are another one of the top kids toys that are incredibly popular this year. They’re just about impossible to find in the stores but this is something that you will want to track down because kids go crazy for them. Zhu Zhu’s chatter, coo, and purr when you love them and pet them. They scoot and scamper all over the floor and will amuse everyone in the room. You can buy them their own little habitat to live in and teach the kids the responsibilities of pet ownership. Don’t let your kids miss out on the fun!
In the game category, the Mattel Mindflex is an amazing game of mental concentration where the headset that you strap around your head monitors your brain waves. By mentally focusing, concentrating, and then relaxing your mind, you’re able to move a foam ball through a pre-set obstacle course. This great game can be played by yourself or in groups. Test your accuracy and speed, or just try to get through a course. This is a tough game to get your hands on so don’t wait much longer to order.
There are many great toys for sale this year. Even though some of the top kids toys for Christmas are already sold out in the stores, there is still an opportunity for you to buy them online. Take advantage of the free shipping that’s being offered now!
About the Author
Tina loves to help people prepare for the Christmas shopping season by finding gift ideas that are both popular and reputable. Everything that she reports on has been researched for consumer quality and reputation.
Mindflex Mattel Games : Move with Your Brain
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Mindflex Game $46.99 Mindflex Game A lightweight headset containing sensors for the forehead and earlobes measures your brainwave activity. When you focus your concentration, a small foam ball will rise on a gentle stream of air. Relax your thoughts and the ball will descend. By using a combination of physical and mental coordination, you must then guide the ball through a customizable obstacle course-the various obst… |
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Mindflex Duel Game $46.98 Mattel Mindflex Duel Game – Mattel T8498…. |
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Loopz Game $15.00 REVIEW: Designed for single-player fun or multiplayer action, Loopz is a high-energy music memory game that tests kids’ skills and gets them moving. This interactive game takes the basic premise of Simon Says and dresses it up with a slick soundtrack and seven challenging modes. Players aged 7 and up will test and strengthen their memory, flexibility, and rhythm with musical play. Loopz Ages… |
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Mindflex Game $44.95 Mindflex–featuring a headset that reads your brain waves and a levitating foam ball–is the kind of game that must be seen to be believed. Recommended for players aged eight and older, the game begins when you strap on the headset so you can use your powers of concentration to move the ball around the game console and through a mind-bending obstacle course. A dial-in console lets you to keep the … |
Kid Galaxy Rc Demolition Derby
Kid Galaxy Rc Demolition Derby
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Kid Galaxy Rc Demolition Derby $28.12 Get real bang up demolition derby action anytime, anywhere! Just power up the cars and crash’em together or smash’em into objects and instantly the car will crack up. Crash head on and the roof, hood and a door will be dislodged. Smash and hit the rear bumper and instantly the trunk and a door are popped open. Drive busted up or push on the ejected parts to restore! It’s just smashing!… |
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Kid Galaxy Interactive Radio Control Mad Dog Motors Demolition Derby $29.99 Get real bang-up demolition derby action anytime, anywhere! Just power up the Mad Dog cars and crash’em together or smash’em into objects and instantly the car will crack up. Crash head on and the roof, hood and a door will be dislodged. Smash and hit the rear bumper, and instantly the trunk and a door are popped just smashing. Includes two radical full-function radio control demolition cars, plus… |
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Mad Dog Motors Patriotic Flame RC Car Get real bang up demolition derby action anytime, anywhere! Just power up the Mad Dog cars and crash’em together of smash’em into objects and instantly the car will crack up. Crash head on and the roof, hood, and door will be dislodged. Smash and hit the rear bumper and instantly the trunk and a door is popped open! Drive busted up or push on the ejected parts to restore! It’s just smashing!… |
