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DaveF

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  1. @KT88, thanks for the reply. Your points regarding an active crossover are valid. I'm glad I only paid $75 for the Ashly (anyone want to buy a nice pro audio crossover?) There is still the matter of gain matching if the two amps are not identical, and incorporating a sub will require additional work. If I understand your basic point, I don't want to introduce any external filters.
  2. The detailed information and feedback is much appreciated. Why does the Heresy IV have two sets of binding posts? If the reason is multi-amping, why not three pairs? If the reason is biamping, it seems the use of the internal crossover network is assumed, with separate external power sources being used - one for the woofer, and the other for the midrange/tweeter combo. Is this worth the effort and expense? We know that the internal crossover network of the Heresy IV splits the signal at ~850 hz. If I'm going to biamp, why not use an external crossover to split the signal at this frequency? Then I wouldn't be sending full range signal to both pairs of binding posts. 20-850 hz from one amp, 850 and above from the other. Perhaps this is simply a waste of time. Not using both pairs of posts makes me feel like I'm leaving something unused, something that might improve... something. BTW, my biamp setup worked fine, but either the Ashly crossover or the Fosi class D amp created occasional loud tones in one channel, so I'm dropping back to one amp (Schiit Aegir), which sounded great all along. I may try a Minidsp 2x4 HD /mic/REW combo to EQ the sound (because I can't seem to leave well enough alone.)
  3. Regarding Heresy IV: When I remove the binding post bridge and connect a stereo amp to the lower two posts, I get sound from the woofer. connecting the amp to the upper posts gives sound from the mid range and tweeter. Does this imply that the internal/passive crossover is being bypassed for the lower pair? I am testing an active crossover (Ashly RX-1001) for horizontal biamping. The active crossover frequency is set at ~850 Hz. The high/mid output for each channel feeds a class A amp, which is connected to the upper pair of binding posts. The low outputs feed a class D amp, which is connected to the lower pair. I'm managing the gain difference with the Ashly's controls. In this case, is the signal from the class D amp going directly to the woofer and the signal from the class A amp going to the internal/passive crossover and then to the mid range and tweeter? I've seen suggestions that proper bi or tri amping requires bypassing the internal crossover, but I really don't want to mess around inside the speaker cabinet. This project is driven by curiosity, not necessarily the pursuit of better sound. It's a hobby... I do stop messing around and listen to music most of the time. But right now I'm trying to understand what's going on.
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