Dear AVS Forum,
I have read certain articles about subwoofers and have learned a lot of therical basics. The problem is that when i want to confirm the theorical with the practice i've found some diferences. Explanation:
At the following link (i think it;s a good reference for newbies):
If you have an older receiver and subwoofer combination that doesn't offer an LFE connection, then you can also use speaker-level inputs. They also bypass the receiver's built-in crossover and send an amplified signal to your subwoofer. Just hook up your sub from your receiver's front left and right speaker outputs using ordinary speaker cable. This will be a full-frequency signal, but the sub's built-in filter will block the higher frequencies. Then, connect your stereo speakers via the subwoofer's speaker-level outputs. Your sub will pass on the unfiltered, full-frequency signal. If your sub does not have speaker-level outputs, you can wire the sub and stereo speakers in parallel using your receiver's speaker terminals.
Just keep in mind that you will be sending an amplified signal from the receiver, which will be reduced to line-level by the sub, then amplified again by the subwoofer amp, so this isn't an ideal way of doing things. This method should only be used if you can't make either an LFE or un-filtered line-level connection.
Two main issues:
1. If i connect as said the sub's built in filter (crossover potentiometer), the stereo speakers will only be sending mid to high frequencies (the unfiltered). So my question is, if i am connecting speakers with these specifications:
Tweeter1" (25mm) polyurethane dome
Woofer6 1/2" (165mm) injection-molded polypropylene/graphite cone, with integral Santoprene™ surround
Frequency Response 55Hz - 20kHz ±3dB
This speaker will not be able to reproduce the midbass frequencies because they have been filtered by the active sub, so in this case i assume this connection is not the best because i am missing some frequency range of the speaker. Am i right?
2. The article mentioned that the speaker level input will be reduced to line level by the sub and then amplified again. I have connected the input and output speakers at my sub. I found that if i power off my sub, the speakers output keep playing. So, my question is, if i power off my sub the speakers output should be disable? because if the sub made the speaker to line level convertion it should need the power from the sub to amplified the signal. Am i right?
I really want to clear all this doubts to make sure which connection is the best and will gives me the best performance. Hope somebody with more experience could help me.