I have been discussing the development of this special speaker in the What’s On the Bench Tonight thread lately. It’s matured enough to deserve its own thread now. This is a 2 way stand mounted speaker, originally inspired by the 10F/RS225 FAST speaker but now with a Dayton PS95-8 paper cone midtweeter and SB Acoustics SB23NRXS45-8 paper cone woofer. The tweeter is now on top and there is a reflex port for extended bass. The crossover is kind of complicated, but the result is worth it because this PS95 has incredible reach into the upper registers for a lot of air. The SBA woofer has great bass and a superb mid range. Custom crossover uses all bespoke components including all air core inductors. No iron cores here for this special speaker. Xo point is at about 900Hz (FAST) and about 2nd order but positive absolute phase. Cabinets will be hand built and assembled one by one in Texas.
Here is the design thus far on CAD:
Prototype tested looks like this:
Measured response:
Impedance sweep (blue trace) nominal 8ohm speaker with minimum dip to 5ohms from 2-3kHz:
This is a commercial speaker so I can’t give away the crossover. Crossover PCB layout looks like this:
Subjectively, it is similarly voiced to 10F/RS225 FAST but with higher top end reach, lower bass extension (vs sealed box) and slightly higher 85dB sensitivity.
You can listen to a recording of sound clips here:
Here is the design thus far on CAD:
Prototype tested looks like this:
Measured response:
Impedance sweep (blue trace) nominal 8ohm speaker with minimum dip to 5ohms from 2-3kHz:
This is a commercial speaker so I can’t give away the crossover. Crossover PCB layout looks like this:
Subjectively, it is similarly voiced to 10F/RS225 FAST but with higher top end reach, lower bass extension (vs sealed box) and slightly higher 85dB sensitivity.
You can listen to a recording of sound clips here:
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