Auto on sensitivity low and early timeout to standby mode.
I have to turn volume up to uncomfortable levels to get the sub to trigger on. It will then timeout prematurely when bass content is anything but monstrous. Is there a way to jumper something on the circuit board to overide the auto-on/timer circuit so I can manually turn the sub on and off with a power strip? Sunfire won't give me access to schematics or any technical advice.
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Some/most Sub Woofers have a Switch that turns them Off/On/ or Auto. On Auto, the Sub only turns on when there is a signal present. ( sound coming into the Sub ) When there is no signal, the sub goes into standby mode. Wireless subs may be made to be in standby mode as the default.
Low level inputs are designed to take signals directly from an amplifier's "sub out" connections. That way the KLH amplifier will use those signals to produce sound and the volume can be balanced between the main amplifier and the sub amplifier using the sub's volume controls. Depending on your amplifier and sub, that is the best way to connect them. However, be careful running the RCA cables since the low levels are more subject to interference. Keep the runs as short as possible and use high quality shielded cables for the interconnects.
The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.
As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.
If you've got power then that's a good thing. It could be something simple as a broken solder joint or bulging capacitor.
You don't name the electronics, which can be the source of the problem. See #3.
1. If you suspect the cable why don't you just swap in another RCA cable? BTW: there's no such thing as a "subwoofer" cable. Monster makes their money on those beliefs. Cables don't wear out but they can go bad if one or more conductors fails. Oxides devolp at either end which can inhibit conductivity. Remove each end and reinsert it with a twisting motion.
2. Maybe. You need to ensure the sub is defined. Run speaker level check. If no sound at the sub, prove the LFE/sub channel has output by running the RCA cable to a recorder or your TV (low volume). If there's no signal, duh, no speaker will work with it.
3. Mmm, not if it's exhibiting the same problem as the old one and the Polk 450. Have you looked at the setting of the Standby/Auto/On Switch? And the Power Mode LED's? Red is bad.
Neither the amp or the sub have grounded power cords.
I have discovered the ML Dynamo takes about 30 minutes to switch to
standby in auto mode.
With speaker level inputs connected to the Onkyo
A807 amp, both units powered from the same wall outlet, Dynamo sub on
Auto, the sub hums for about half an hour after the Onkyo is switched
off, then the sub goes quiet. Not so good.
I connected a bonding wire between the two units on 3_7_09. If I smoked
some old audio gear I could just look at that as an opportunity, right?
Works fine. Now I have the ML powered from the wall and working
I was able to take care of this issue by talking to Onkyo tech support. They diagnosed over the phone and concluded that the receiver set the volume for the sub way too low (-12), therefore sub was not receiving the input and was doing what it was supposed to be doing. They walked me through manually increasing the volume and now everything works great.
Good luck! I hope this helps.
The receiver automatic speaker set-up set the sub volume at -12 and since it was not getting any signals from the receiver it was doing what it is supposed to be doing (going to the standby mode). This was troubleshooted by Onkyo tech support on a Sunday. All the best about Onkyo customer support.
On your signal source, make sure you have the sub set to on.
If you can adjust the output setting on your source, turn this up.
Adjust the volume setting on the sub lower to mach the volume of the main speakers.
You may need to make these adjustments a few times to get them working.
On the hum and noise problem
Check your power outlet for the sub, make sure the polarity is correct. I have found this to not always be right. Also what is on that same circuit. Things like the fridge can cause a lot of noise on the power line. Next check your connecting cables, are they of good quality? Are they running next to anything that may cause interference? Also check you connections to the signal source. Cable and dishes are known for ground problems.