Wednesday, September 17, 2025

Powering Woofer Mark I


 The front view of the Mark I.  The original SNR-1 is on top.  The twin 10" aluminum woofers sit underneath.  

Below is the rear view, showing the tweeter and mid-woofer connections on the back of the PW-1's cabinet.   Note that the bottom section has a 3-way Class D amplifier.  The speaker jacks on the bottom cabinet are amplifier outputs.   

 The SNR-1 were originally intended to be passive speakers but with an external crossover.  In this case, the removal of the external crossover and connection to the PW-I was trivial. 

The drivers are Dayton Audio RSS265HF-8.  They are 10" aluminum and in this sealed cabinet would do 40 Hz alone.  I had the choice of doing 1 10" woofer, ported to get to ~ 25 Hz, or 2 sealed and I went with sealed for the higher output, lower distortion, and lower group delay.  It did need a little boost in the DSP, but I have so much output available in my modest living room this was trivial.  Also, since this is now tri-amped I can afford to give the bass more power and still have another 250W for the mid and 100W for the treble. 

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