1987 - 2017: Thirtieth Anniversary!
Best viewed in "landscape" mode.
EPI & Epicure Speakers:
The Epicure 1
|Dimensions:||42 3/4" x 12" (9 1/4 at front) x 13"|
|Response:||32 to 20k Hz|
|RMS Power:||20 to 200 watts|
|Crossover||160, 500, 2500 Hz|
|Two 8" woofers||PRO 028||$59.00 each|
|Two 4" midranges||PRO 026||$42.00 each|
|1" tweeter||PRO 002 ME 2||$54.00 each|
Crossover schematicphoto/top - specifications - equalizer - order parts
Note: This schematic was developed from a pair of customer photographs, one of the component side and one of the trace side of the circuit board. He also wrote down the values of most of the capacitors. I had to make some educated guesses as to exactly where certain component leads went through the board, and where two or three traces actually were located.
You will see that the lower woofer and both midranges are wired "out of phase". The upper woofer incorporates a high pass filter as well as a low pass. This is a bit odd, since I would expect both woofers to carry the full lowest frequency signals. However, it may be mostly for phase shifting purposes.
I would love to get my hands on one of these and verify/update all these details.
|Dimensions:||2" x 5 7/8" x 8"|
|Input Impedance:||50 kΩ|
|Output Gain: (ref. 1 volt, 0dBv)||π/2 +14 dBv at 35 Hz, -3 dB at 70 Hz|
|π +8 dBv at 35 Hz, +2 dB at 70 Hz|
|2π +2 dBv at 35 Hz, +37 dB at 70 Hz|
|Step Corner Frequency:||100 Hz|
|Output Gain: (ref. 1 volt, 0dBv)||+0 to +6 dB at 190 Hz|
|Bandwidth:||+/- 75 Hz|
|Subsonic Filter:||12 dB/octave, -3 dB at 22 Hz|
(with Boundary Control in π position)
|Response:||200 Hz - 40 kHz, +0 dB, -3 dB|
|Distortion: (1 v output)||< 0.02 %, 20 to 20k Hz|
|Signal to Noise:||> 80 dB, ref. 1 v out (unweighted)|
|Power:||250 mA at 18 v DC|
* "The SPEQ provides control of the deep bass and mid-bass sound regions to overcome room/speaker interaction effects. The SPEQ insures maximum performance in any location."
The Boundary Control is set based on how much of the space around the speaker is a reinforcing surface, that is, a wall. π/2 is ninety degrees, and would be chosen if the speaker is in a corner. π is 180 degrees, and is used when the speaker has its back against a wall. 2π is 360 degrees, and is used when the speaker is out in open space several feet away from all boundaries. As far as I can tell.
Here is a close-up of the control knobs: