Find me a testing lab!

[greg o]

Hi Everyone,

I just joined your organization and am looking forward to the threads! To that end, does anyone out there know of an independent laboratory that can verify claimed specifications for speakers ((Frequency response, Amp power, sensitivity, maximum output, cross over points, etc,. )?

Looking forward to the response!


Greg O

[Omnipresent Sound R&D Inc]

Omnipresent sound Research and Development Inc. is a product developer and a Loudspeaker test lab we are founders of OPS-R&D Inc. and Inventors, five time patent holders for the reproduction of sound in a omnipresent mannor.We also do complex data reports for other Invevtors who need help each report hads a complete set of graphs and it complex data. We can give you ETC,TDS, RTA, POLAR ,OVERLAYS PHASE WATER FALL, FFT along with full spherical balloon plot We use the TEF-25 Acoustical Analysis TDS Time Delay Spectrometry, here are some spec's.Measurements/Displayson here is just some of what we can do Thank you from OPS-R&D Inc.& Merkaball Loudspeakers Merkaball@aol.com main office
Energy Time Curves (ETC)
Selectable frequency range and sweep time
Selectable number of data sample points (512, 1024, 2048, 4096, 8192)
Selectable measurement windows (Blackman, Hamming, Hanning, Kaiser, Rectangular)
Selectable scaling parameters as fine as one dB per division or auto scale
Data cursor displays absolute or relative amplitude
Frequency and Phase Response Curves
Selectable frequency range, sweep time, frequency resolution, sweep rate and bandwidth
Selectable number of data sample points (512, 1024, 2048, 4096, 8192)
Selectable scaling parameters as fine as one dB per division or auto scale
Data cursor displays absolute or relative amplitude
Noise Criteria Curves (NC)
Uses ANSI* type one filters
Selectable integration time (1 to 9,999 seconds)
RT60
Calculated from ETC data
Reverberation time
Direct/reverberant ratio
Speech Intelligibility-% ALCONS
Calculated from ETC data
Calculated direct/reverberant ratio
Displays Schroeder Integration Curve
Speech Intelligibility-RASTI and STI
Displays data in tabular or graph format
Stores NC and ETC data taken during measurement
Ability to post process with different noise values
3D Waterfall
Select from 2 to 100 curves
Examine data from left or right, forward or reverse view
Nyquist Display
Amplitude and phase information in a polar format
Heyser Spiral

Three dimensional plot of the real and imaginary components of the TEF signal
Averaging mode
Either vector or magnitude averaging of both frequency and time curves Overlays
Available for energy time curves, frequency and phase response measurements
Difference mode
Available for energy time curves, frequency and phase response measurements

Pass / Fail Mode
Allows comparison of data to a reference curve
Smoothing of data

Percentage octave smoothing of frequency data (0 to 1000%)
Sound generator

Enables the TEF to output pink noise, white noise, and pure sine wave tones
Data storage

Data storage limited only by hard drive or floppy disk capacity
Function keys

Quick access to frequently used commands
Configuration files

Storage and recall of global parameter settings
TEF requirements

Works with TEF25, TEF20, TEF20 HI and TEF20 SHIP
Computer system requirements

Microprocessor- Pentium class

RAM- 16 megabytes of available memory

Monitor - VGA (640x480)

Hard disk- 6 megabytes for installation

Operating system- Windows 95, 98, NT, 2000 or XP

Netscape or Internet Explorer for on line manual

FOR TEF20's -

Interface, parallel- One bidirectional 8-bit parallel port. Must be assigned as LPT1 or LPT2

Interface, host- One 8-bit ISA expansion
(TEF20 HI)- slot for TEF20 HI-PC card

* American National Standards Institute

®The trademark SOUND LAB is licensed under United States Trademark Registration No. 1,424,678 and 1,732,027.