Archive
8X25R
Designed By Samuel James Balk
Design Goals:
– 2.5-way design
– Active processing
– F3 of at least 50Hz
– Visually striking
Key Features:
– 2.5-way design
– +/-1.5dB from 50Hz to 30,000Hz
– Excellent Off-Axis Response
– Handmade compound front baffle constructed with layered 1.5″ MDF wrapped in carbon fiber
– Sealed enclosure
– Rear cabinet constructed with 1/2″ plywood and 1/2″ MDF sandwiching mass loaded vinyl
– 4th order asymmetrical crossover at 2200Hz
Drivers:
Fountek FW200 8″ Aluminum Woofers
Fountek NEO X 3.0 Ribbon Tweeter
Frequency Response
Integrated Frequency Response
Epimetheus
Overview:
I set out to create critical listening speakers that will be enjoyable in any room you put them in. This was accomplished by creating a floor standing pair of speakers with great off axis response to make the largest “sweet spot” to fully enjoy your music. I believe speakers should be flexible enough to be an afterthought when you are relaxing to your favorite music.
Epimetheus utilizes a passive 2.5-way crossover design which means, compared to a 2-way crossover, there is an additional woofer that handles only the bass frequency.
Features:
+/- 2 dB from 70 to 17k Hz
Great Off Axis Response
Under $800
Floor standing
F3: 60 Hz
Drivers:
Tweeter: The Morel MDT29 was selected for it’s good off axis performance, and low frequency extension that allows it to be crossed over around 1800 Hz
Woofer: The Seas L16RN-SL was selected because its Q(tc) indicated it was suited for a sealed box, plus it has good low frequency extension for its size.
Documentation:
Testing Results:
Full Range
Purple: Full Range, Red: Tweeter, Blue: Mid-Woofer, Green: .5 Woofer
Full Range, Mid Woofer Inverted
Horizontal Off Axis Response
Purple: 0º, Red:15º, Green: 30º, Blue: 45º, Orange: 60º
Vertical Off Axis Response
Purple: 0º, Red:15º, Green: 30º, Blue: 45º, Orange: 60º
Harmonic Distortion:
Step Response:
Impulse Response:
Minimum Phase Response:
Waterfall:
Tweeter Response:
Woofer Response:
Epimetheus by Russell Goddard is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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