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 Report

Crossover Schematic

Drafting

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.

Speaker

This semester I've been designing a pair of speakers. They are a floor-standing (almost 48" tall) and utilize a 2.5 way design, which means that in addition to the normal 2 way design of tweeter and woofer there is an additional woofer that does solely low frequencies.

The drivers I am using consist of the Morel MDT 29 and the Seas L16RN-SL, with a box that is made up of an outer layer of 3/4" Baltic Birch and an inner layer of 1/2" MDF. All told they will weight about 90 lbs.

I think so far they are turning out quite well, the crossover still needs some tweaking, but I can't wait until they are finally finished.

Assembling the side panels.

The basic shape of the box with all the pieces dry fit.

Gluing the front baffle on.

Inside the box, you can see the two braces.

The first iteration of the crossover.

Speaker Testing.