Quoted from John_C:Many folks, myself included, have noticed significant changes in the audio requiring a look at amplifier settings, adjusting volume levels, etc. During my own troubleshooting efforts to improve the sound, I came across what I believe to be a serious issue.
Looking at the subwoofer connections from the amplifier (located in the bottom of the cabinet below the subwoofer), I noted that both the left and right channels were both connected directly to the single voice coil terminals on the subwoofer speaker. This kind of wiring gives you a parallel connection-level output.
This practice should be avoided because both channels will be seen as a short to each other, which is a fault condition. The problem is that the two channels can have opposing polarity voltages at any given instant - Obviously, since the two outputs have distinct sound signals. Since they are opposing, current will be driven back into one or the other speaker outputs of the amp. This will heat up the output stages of the amp causing it to run hotter, making it vulnerable to heat damage over time. And needless to say, this kind of connection deteriorates the quality of sound the speaker produces.
What I did to correct this was remove the right channel connections going to the subwoofer from the back of the amp and leaving the left channel connections in place. This ensures that only a mono signal is sent to the single voice coil of the subwoofer.
After correcting my subwoofer wiring, I spent some time further dialing in the sound. I can say that the sound is significantly improved. The sub is no longer boomy or over-powering the backbox speakers. I was also able to get the amplifier knobs properly set so that I am able to get more useable “range” in the speaker settings, allowing more granular adjustments of the sound levels.
And "Don't Fear the Reaper" freakin ROCKS !!!
Below is a pic of my current sound amplifier settings. Imagining a scale of 1 to 10, I have my knobs set as follows:
- Sub Volume: Approximately 2 or so. This is a tough one to get dialed in as there is very little useable range in the knob between adding bass and it suddenly becoming too much.
- X-Over: 5
- Treble: 9 (I like a lot)
- Base: 4
- Volume: 3
Hope this helps.
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John_C if I'm understanding you currently, the solution is to disconnect one of the two channels going from the amp to the sub, is that correct?
I understand the concern with having both channels connected if the amp isn't meant to be bridged but what I don't know is how it will handle only outputting a signal to the sub from one channel. Does that not also cause an imbalance?
Would adding a dual voice coil sub be the preferred solution?