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In Reply to: Tweaking subwoofer amp - Is it worth it? posted by Dan W on May 05, 2000 at 16:32:50:
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It is not class 'D', I believe it is said to run in class A-B mode...It does produce good sound, but I am looking for input into how to make it sound even better. Any comments would still be helpful.Dan
I have two parts express 100 watt/8, 150 watt/4 sub amps. I use the low level inputs. There were small square film caps on the link to the low level out. I removed them and cut out the stock rca jack assembly and replaced them with individual gold plated units wired directly to the pc board with silver wire. There is also a large bass boost on the amp circuit that when removed improves the sound and the sensitivity of the controls. The HexFreds sound like a good idea. I have used them in a number of applications with good sonic effect.
That is an excellent idea, but I am running the full range signal from my speaker terminal outputs and am relying on the crossover network in the amp. I have considered simply installing a 24db(?) crossover (actually just a coil) set for my usual listening point of 60db. Outside of using an electronic crossover, I don't see any other way of going about it. I have considered trying to tie the low level inputs into the crossover network and thus not have to use the cheesy binding posts on the amp.I am also still using the cheap hookup wire and clips to connect the amp to the subwoofer cable. I have the amp sitting in a box with binding posts on the outside where I connect my sub cable to. The subwoofer cable is made of three runs of cat five plenum rated cable, braided (3 whole cable braided, not individual twisted pairs) and then I have the cable hard-soldered to my sub. I figure that I could probably get some improvement from replacing stock hookup wire with something beefier and directly soldering it to the posts on the PCB.
Dan W
I hav my amps in seperate boxes as well. I replaced the hookup wire with 12 guage. The built in X-over only filters the woofer from the X-over frequency selected by the pot control. Both high and low level outputs are full frequency.
I don't quite understand what you mean when you say that both high and low ouputs are full frequency. I thought that the low level inputs bypassed the integral amp crossover thus sending a full range signal to the sub. I understood this to be used if you have a receiver, etc. which has already filtered the sub out signal. Could you please explain again, sorry, confused. Thanks in advance,Dan
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