Posts Tagged ‘2.5-way’


April 27, 2017 Leave a comment

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
Fountek FW200 8″ Aluminum Woofers
Fountek NEO X 3.0 Ribbon Tweeter
Frequency Response
Full System FR
Integrated Frequency Response


8X25R Research

8X25R Glossy




April 29, 2012 Leave a comment


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.


+/- 2 dB from 70 to 17k Hz

Great Off Axis Response

Under $800

Floor standing

F3: 60 Hz


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.


Testing Report

Crossover Schematic


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:


Tweeter Response:

Woofer Response:

Creative Commons License

Epimetheus by Russell Goddard is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.