AFTER 2 DAYS, THE AMPLIFIER FRIED BECAUSE THE HIGH-LEVEL OUTPUTS GOT SHORTED SOMEHOW. FAIR TO SAY THIS EXPERIMENT WAS A FAILURE.
I wanted to test the high-level subwoofer output myself and bought a Yamaha YST-SW315 from Amazon Warehouse (returns) for $236 delivered. It's 10" paper cone, 250w. Lots of power and pretty tight (although not Rhythmic). It's not sunfire small but no bigger than I'd expected it to be for a down-firing design. Footprint is slightly larger than my laser printer and fits fine under my desk.http://usa.yamaha.com/products/audio-visual/speaker-systems/subwoofers/yst-sw315_black__u/?mode=model
The resistance between the high-level input channels (left input red & right input red) was 40k. That's enough resistance so that virtually
no current is crossing between channels
, blowing up the amp.AT SOME POINT DURING MY 2 DAY EXPERIMENT, THE SUB DID SEEM TO SHORT THE CHANNELS, KILLING THE AMP. PERHAPS THIS OCCURRED DURING THE STAND-BY TRANSITION. NOT SURE.
WITH THIS SUBWOOFER, CROSSING THE HIGH INPUTS IS A FAIL.
I'm letting the high-pass cross-over fade the low bass so the speakers don't see it. Turning down the sub to 0% kills the low bass on the speakers, as it should. I have the sub turned up 80% with the Stand-by enabled.
Everything is coming through the amp as it should, including a very slight turn-on pop. I don't hear any distortion although the audiophile in me "wonders."
The "high cut" allows crossing between 50hz - 150hz. With these Tannoy 601s, 75hz or lower provides nice reinforcement that blends really well. I'm losing some low-bass when I go all the way down to 50hz. It fills in all the way to 75hz and then starts to get messy.
For small bookshelf speakers, this scheme will dramatically extend the life of your cones. Tiny drivers just aren't made to do this kind of excursion. Put your finger on the 10 inch woofer cone and ask yourself whether your bookshelf speakers should be trying to reproduce that.
NET-NET, WITH THESE TRIPATH AMPS, ASK ME TO CHANGE THE CAPS TO CUT OUT LOW FREQUENCIES FROM THE MAIN AMP. PAY ONLY SHIPPING.