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CONTENTS
Specifications
Introduction
Installation
Separate Components
Biamping
Operation
Setting Qs
Setting Fs
Setting BOOST
Setting Qb
Vented Speakers
Final Adjustments
Technical Description
Circuit
Options
Assembly (kit version)
General Wiring Practice
PC Board Assembly
Chassis Wiring
Appendix A - Schematic Diagram
Appendix B - PC Board Layout
Appendix C - Chassis Layout
Appendix D - PC Board Parts List
Appendix E - Overall Parts List
Marchand Electronics Inc.
PO Box 18099, Rochester NY 14618
Tel:(585) 423 0462 Fax:(585) 423 9375
info@marchandelec.com www.marchandelec.com
(c)1997....2005 Marchand Electronics Inc.
WM8 Installation Instructions
Marchand Electronics Inc
Appendix F - Troubleshooting
SPECIFICATIONS*
Frequency Response
(Boost=0, Qs=Qb)
Harmonic Distortion
Signal/Noise Ratio
Input Impedance
Output Impedance
Maximum Output Voltage
Output Load Capability
Bass Boost Range
Net Q Range
Dimensions
*Specifications subject to change without notice.
INTRODUCTION
The BASSIS is a specialized electronic
equalizer which enables acoustic-suspension
(closed-box) loudspeakers to take on a wide
range of alternative bass responses improving
some vented (bass-reflex) designs.
By adjusting the front panel controls, the line-
level audio signal is equalized as the exact
inverse of a given loudspeaker's bass response,
and the new bass cutoff frequency and damping
are defined. The filtered signal is then passed to
the power amp and on to the speakers, where the
existing bass response is cancelled and replaced
by the desired bass response. Figure 1 illustrates
the frequency response at various points in the
signal path.
www.marchandelec.com
1
2 Hz-100kHz
<.01% (1 kHz)
>110 dB (Ref. 10 V)
80 kΩ
10 Ω
25 V (P-P)
100 Ω (min.)
0-24 dB
.25 - 1.0
17"W x 8.5"D x 3.5"H
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Summary of Contents for Me WM8
- Page 1 Marchand Electronics Inc. PO Box 18099, Rochester NY 14618 Tel:(585) 423 0462 Fax:(585) 423 9375 info@marchandelec.com www.marchandelec.com (c)1997..2005 Marchand Electronics Inc. WM8 Installation Instructions Appendix F - Troubleshooting CONTENTS Specifications SPECIFICATIONS* Frequency Response Introduction (Boost=0, Qs=Qb) 2 Hz-100kHz Harmonic Distortion <.01% (1 kHz)
- Page 2 INSTALLATION There are several ways of connecting the BASSIS to you system, depending upon your present setup. In any case, make sure all components turned while making connections, and read the rear panel labelling carefully. Do not apply power to the unit when installation is complete.
- Page 3 speaker's value for Qs is .5, then Figure 5 shows OPERATION that its -3 dB point is near 1.6 x Fs. Thus, if your specs indicate a -3dB poi9nt of 75 Hz, then a The various controls on the BASSIS must be setting of Fs = 75/1.6=45Hz should be used.
- Page 4 contrast, the BASS control on your receiver or preamp indiscriminately boosts the entire low- frequency portion on the signal, often leading to a "boomy" or "heavy" quality.) A setting of BOOST = 0 dB will not extend the bass, but will allow you to effectively adjust your woofer's damping by changing Qb as described below.
- Page 5 extend smoothly into the lower bass, particularly VENTED SPEAKERS when using high-quality source material. On the other hand, extending the bass The BASSIS can be used to reduce the response will make your system more sensitive to boominess of poorly tuned vented ("ported", "standing waves"...
- Page 6 frequencies, pot VR1 is actually labelled BOOST, operation. Simply follow the steps in the with a range of 0 to 24 dB. "Assembly" section of this manual, but wire the inputs of a second + 15 V power supply to the Switch S1 activates the 20 HZ CUT (high-pass, power cord as well, and power the Right-channel infrasonic, or "subsonic") filter with an 18...
- Page 7 marked Brown-Black-Black-Gold-Brown is a 10 [ ] 1. Bend the leads of resistors R1-R35 Ω resistor with 1% tolerance. and solder them in place as shown on the layout diagram. Cut off the excess leads as you go. [ ] 2. Deleted. 1st, 2nd, &...
- Page 8 [ ] 11. Mount the BASSIS PC boards and power supply inside your enclosure with standoffs and #6 screws. The PS 10-power supply should be oriented with the transformer closer to the rear panel. [ ] 12. Mount potentiometers VR1-VR4 for each channel (total of eight (8) pots on the inside of the front panel.
- Page 9 wire. Solder the brown wire to the cathode lead of Use high voltage (thick insulation) #22 hookup the front panel LED (the cathode is the lead closer wire to make the connections between the power to the flattened edge of the LED). Solder the red entry connector, the power switch on the front wire to a 10k resistor.
- Page 10 8-position jack A of the female Molex connector you will use blue terminal block on the WM8 circuit boards. with P3, to lug F on the Fs pot. Connect jack B to [ ] 28. Mount all the knobs onto the pots, lug E, jack C to lug D, jack D to lug B and jack E and insert the fuse into the fuseholder.
- Page 11 IC1A VR3A VR3B IC3A IC2B IC1B IC3B S2 Rumble Tape In Tape Out Tape IC4A IC4B Input S1 20Hz cut S4 Bypass Off-board connection +15Volt RLY1 Muting R22* -15Volt WM8 BASSIS (c) 2001 Marchand Electronics Inc. Marchand Electronics Inc www.marchandelec.com...
- Page 12 APPENDIX B PC board Layout Marchand Electronics Inc www.marchandelec.com...
- Page 13 Marchand Electronics Inc www.marchandelec.com...
- Page 14 Typical cabinet front panel layout Marchand Electronics Inc www.marchandelec.com...
- Page 15 Molex connector, 3pin, female + pins Molex connector, 5pin, female + pins DPDT relay, 24V coil 8 pos terminal block Circuit board WM8, 3.2" * 4.15" NOTE: D2* and R22* are marked D2 and R22. D2* and R22* are are located near diode D3. ------------------------------------------------------------------------...
- Page 16 Parts list for WM8- KK, full kit ------------------------------------------------------------------------ Bag #3 ------------------------------------------------------------------------ Bag-1, WM8-KK board kit Bag-2, Dual model PS10-K Power supply kit Fuseholder, D type Fuse, 1A DPST Rocker Power switch Voltage Selector Switch Power Entry Connector #6 solder lug 2.4K, 1W resistor...
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