R. J. Barny Hiney CET  P. Eng. ( BC Pndg.)

1045 Beverley Place, Victoria, BC V8S 3Z7

Ph: (250) 595-1120 Fx/Msg: (250) 388-7387

e-mail:   hiney@bc.sympatico.ca

May 13, 1999

 

Holosphear 4D        Ph: (604) 506-5019                                                                                  

3885 S. Decatur Blvd., Suite 3010    Fx: (604) 990-0956

Las Vegas Nevada, USA  89103

ATTN:  Josef Tyls   Vice-President of Engineering

C/o     TYLS Dynamic Systems,  
 North Vancouver,
BC Canada  V7J 1G3

 

Dear Josef Tyls:

 

This report will summarize the tests performed on the Holosphear 4D Mark IIIc speaker system and MANIFOLD at your workspace in North Vancouver, British Columbia, on May 6, 1999. 

 

The system under test and review was the Speaker System intended for use with the Live and Theatre Entertainment System presently under development by Holosphear 4D.  The frequency response and audio power tests were verified and conducted on the fabricated speaker units.  The tests were intended to verify the efficiency and wide dynamic range of the speaker system.  One model of each type was tested with the listed measuring equipment and the results recorded.  Multiple models were compared, the comparisons verified, but no data was recorded.  Technical details of the units were not provided.  The units are manufacturing prototypes and are to be exactly reproduced in production.

 

The tests were conducted in the audio test and control workshop located at the above address.  The data was recorded and verified against specifications.  The data was compared to specifications and was not graphed or analyzed, as there was correlation between specifications and the recorded data.

 

The frequency and ouput power data recorded during this test session were sufficient to verify the operation of the units against the specifications provided.  If these prototype speaker systems are reproduced in manufacturing they will meet the stated specifications.

 

Please find the test procedures and results on Page 2/.

 

If there are any questions regarding the contained information please contact the writer.

 

Yours truly,

 

 

 

R. J. “Barny” Hiney

                       

      

Please find below the Test Configuration, Instrumentation and Recorded Data:

 

The test setup included high quality audio power amplifiers, low resistance/high power copper leads and 100 watt load resistors of 5.25 ohms.  Measured by Micronta #22167

 

The signal sources were:   - Pink Noise generator

                        - Sine wave source-- signal generator Model AG2601A

- CD-ROM player and various sound track diskettes

Measuring devices were as follows:

      -Pink Noise, power output voltages- 3 ˝ Digit PROTEK 506-Dual Slope Voltmeter                                                                           

      -Oscilloscope monitoring of sine wave output sine wave and amplitude

      -Sound Level Meters

 

The system was set up near the rear wall of the audio room and the sound level meters placed 1 meter from the speaker system.  The Pink Noise source was adjusted and level set, averaged over 10 seconds, for an output of (.920 to 1.012 Volts) producing an audio output level of 88 dB.  The output was standardized at 1kHz at 87 dB ( 1.012 Volts).

The results for the Holosphear 4D Mark IIIc speaker system are as follows:

            30 Hz               66 dB            @ 1.005 Volts

            35 Hz               72 dB            @ 1.009 Volts

            60 Hz               83 dB            @ 1.017 Volts

            70 Hz               86 dB            @ 1.018 Volts

1 kHz               87 dB            @ 1.012 Volts

            12 kHz             87 dB            @ 1.012 Volts

17 kHz             81 dB            @ 1.004 Volts

20 kHz             68 dB            @ 1.009 Volts

 

The system was set up near the rear wall of the audio room and the sound level meters placed 1 meter from the speaker system.  The Pink Noise source was adjusted and level set, averaged over 8 seconds, for an output of (.800 to 1.102 Volts) producing an audio output level of 86 dB. The low frequency corner is 35 Hz.

The results for the Holosphear 4D MANIFOLD speaker system are as follows:

            16 Hz               58 dB @ 1.008 Volts

            20 Hz               66 dB @ 1.008 Volts

            25 Hz               70 dB @ 1.001 Volts

30 Hz               81 dB @ 1.001 Volts

            35 Hz               87 dB @ 1.008 Volts

40 Hz               86 dB @ 1.003 Volts

            80 Hz               95 dB @ 1.001 Volts

The Crossover network functions @ 90 Hz and was operational.

 

Various frequencies throughout the spectrum were measured to ensure and verify flat response. There were no exceptions or anomalies and data was not recorded.

A demonstration of performance was provided and the system performance was excellent.

P2