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In Reply to: High or low level sub inputs? posted by getheleadout on May 9, 2007 at 16:34:56:
I prefer high for these reasons:
The sub and main speakers are usually easier to integrate.
If you change amps, you don't have to reset the subs.
Eliminates the need for dual outputs on a preamp.Happy listening.
Follow Ups:
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Antonio Melo Ribeiro
Obviously it wasn't and that's a shame because JerryS is an extremely knowledable and helpful member, not someone that should be discouraged from posting.It appears to me the original post was interested in opinions and experiences on the subject of high-pass vs low-pass subwoofer connection and it's unfortunate anyone would use it for chest beating, something I'd like to discourage.
JerryS has a wealth of good info and advise at his site linked below.
Cheers
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Antonio Melo Ribeiro
Hi Antonio,
I change amps quite often, and I think my comment is correct. When you change amps using the high-level sub input, even for one of significantly greater or lesser power, the volume of the subs changes proportionally. The crossover frequency of the sub is dependent on the main speaker, so no change there is needed.There may be some minor tweaking if you change from a soft and flabby tube amp to a way-tight and controlled solid state amp, for example, but the settings should stay almost completely unchanged.
Please tell us why you think this is incorrect.
Hi Jerry,You have a very good point, it would be absolutely correct if amplifiers where wires with gain...
Even though the volume of the signal changes proportionally, amplifiers react differently to the load of the speakers, again, with easy speakers the difference would be negligible...
Antonio Melo Ribeiro
which is my main gripe with speaker-level inputs. Even when the sub amp is turned OFF(!), the main amp's character changes, probably b/c of the impedance of the sub amp the main amp's speaker outputs are "seeing."
Hi Jon,
I'm not saying you're wrong, but I have never noticed this. Very interesting! Can you tell us on what model(s) of sub and main amp you heard this?Maybe the sub is relatively lower impedance and the amp is higher? Just guessing, but worth trying to understand. In my system, the amp would be <1 Ohm and the sub 20k Ohms, which should minimize any interaction.
Thanks,
JerryS
I have had a similar experience. High level was the best blend with my sub and Maggies.I never could get a good blend with low level, even though it would make things easier for my tube amp (at the time) to drive. Some of that is that the crossover points IMHO were a bit high at 80hz or 100hz. If it was at say 50hz, it may have worked better.
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