Originally Posted by Glashub
Rob Morse, do you have anything to say about what CJ wrote?
This was the issue to which I was referring to when I mentioned the 1/2 watt standby.
On the second part of his statement regarding input signal, it is true it is possible to send too much signal to the input of the subwoofer which can cause signal clipping. I recommend using the neutral 0dB gain on the LFE channel, if you add gain I would refrain from going beyon +5dB. This should still allow ample head room.
Optimizing the auto on/off performance is all about finding the balancing act of inbound signal to outbound signal. If you have too much input signal and your sub volume is set too low it may not trigger, just the same as if you have too little input signal coming in. Ideally you are looking to find a setting where the subwoofer volume on the DD+ is between 10-30 volume.
It should also be noted that there is a trim pot on the DD+ that can reduce the amount of input signal going into the subwoofer. This could cause you to mistakenly think you are sending more input signal to the subwoofer than the subwoofer is actually receiving.
Another trick is to experiment with the use of a Y-splitter. This will effect the signal strength the subwoofer is seeing. Some people find the subs work better with them, and others find they work better without. Its just another tweak to try when dialing in your system.
Finally consider your crossover setting. If your setting your LFE to 60Hz or 40Hz because your main speaker play deep, you need to accept that very little signal is being sent to the subwoofers. Consider setting your crossover between 80-120Hz. Remember that setting your crossover at 100Hz with a 12dB/octave slope is still going to send extended bass to your mains. The signal will only be 12dB down at about 50Hz. But the increase in crossover point will allow more signal to get to the subwoofer reducing the likelihood it will go into standby.