Originally Posted by shriharsha.p
I live in India and have a Velodyne impact 12, which I use in conjunction with Dali Zensor 7s and a Vokal center, powered by a Yamaha RX v475. My issue is oft repeated in various forums and there are numerous discussions on it. I will not digress on the "whys" of the auto-standby feature but would like to find out options to bypass this sometimes annoying feature.
1. Is there an internal setting (jumper, etc.) that can be modded to leave the subwoofer always on (ie the green light)?
2. If 1. above is possible, will the power consumption significantly increase? Is there a guideline from velodyne on the same.
3. Will using speaker level connections solve this problem and if so, is there any perceptible loss in audio quality of the front L/R mains?
4. Currently, my AVR settings are as follows and the problem is substantially reduced. But watching TV and listening to stereo music still causes the sub to cutoff.
Crossover: 80Hz (will an increase to 100Hz cause more of the non-directional bass signals to be directed to the sub, causing it to stay powered on for longer?)
AVR LFE Level: +6dB (max +10d BB)
Subwoofer trim: +3dB (max +6dB)
Subwoofer volume on back of subwoofer: 10-30 position
5. Considering the max values of AVR LFE level and Sw trim in 4. above, are the current settings prone to cause signal clipping?
Stereo music and TV signals are most prone to this issue often due to the lack of bass signal, the low dynamic range, and system settings. The Impact series subwoofer does not have an always on setting. The auto on/off is always engaged. The issues is a result of insufficient signal being present to keep the subwoofer on. There are a couple things that you might try.
First, make sure you are listening in a surround mode. If you are in stereo (large speakers) or direct mode, the subwoofers will only get signal sent to them if there is a recorded LFE track.
Make certain your speakers are set to small. Having your main speakers set to large tells the AVR they are capable of playing the full audio range. This causes the AVR to only send bass recorded on the LFE track to go to the sub. If there is no LFE then nothing goes to the sub.
If your receiver allows you to set the crossover point for the speakers you have set to small, try raising the crossover point to 100Hz.
In you Yamaha, look for the "double bass" setting. Usually in the same place you select spear size, you can set the subwoofer to "LFE + LR". This will let the receiver know to send bass from the left and right channels to the subwoofer.
Try using a "y" cable to feed the LFE into both the left and right input on the back of the subwoofer.
Experiment with reducing the LFE gain and increasing the subwoofer volume to find maximum responsiveness.
Finally, you could experiment with speaker wire connections. If you do this, you will need to disconnect the LFE cable, then set the left and right speaker to Large. Then set the AVR to have no subwoofer. This will send all signal to the left and right speaker wires which would go to your subwoofer. If you skip this step, the AVR will push bass for the sub out the LFE connection which is not connected to anything.