I have connected the subwoofer to the pre-amp out

Hello. Jacks you are refering to are surround preamp out only. If you want full range audio out use video 1 audio out or video 2 audio out. The set does have a mono subwoofer out. You could have to go into the menu and turn it on but that is where you are to connect a subwoofer to . Larry's Electronics. [email protected]

In the setup menu are the speakers set to large or small? On some receivers if you have it set to large all the bass is directed to the right-left fronts.
On my pioneer receiver if the speakers are set to large the sub-pre-out only works if the receiver is in a surround mode, if its in stereo mode and the speakers are set to large the sub-pre-out is dead. If the speakers are set to small the sub-pre-out works all the time.
Also, some receivers won't send a signal to the sub-pre-out if there is no LFE discreet signal info from the dolby digital or dts bitstreem.
For example I have several older dvd's that light up the L C R SL SR icons on my receiver, but don't light up the LFE icon. I have other older dvd's that just light up the L and R icons meaning they are only recorded in stereo like a vhs tape recorded in dolby surround.
In my basement I also have a kenwood dolby digital receiver.
I've noticed that when a dvd only lights up the left and right icons the pioneer will automatically switch to dolby pro logic surround. The kenwood will only send the signal to the left and right fronts (stereo). If I manually switch it (kenwood) to dolby pro logic I'll get sound from all the speakers just like the pioneer, but it does'nt do it by itself.
Most receivers that have a tape monitor won't work in surround mode with the tape monitor on. The pioneer will let me use the tape monitor with dolby pro-logic but won't pass through a dolby digital signal with the monitor on.
Hope this helps.

Sorry for the stupid question but is your subwoofer a powered sub? The subwoofer out is just a preamped signal that drives a powered subwoofer. Let me know then we can go from there.

If my memory serves me on this amp, the volume control is actually a chip in the pre-amp section.

You could try and replace the actual knob on the panel and see if that fixes the problem.
If not, you will most likely have to send the amp section back to Velodyne for repair.

If you do send the amp back, use some masking tape and mark the speaker leads. Hooking these back up wrong will blow the driver and the amp.

Contact Velodyne.

Should have been a sheet in the box with amp for this

You will need to contact Velodyne.

Fuse in amp may be blown or the amp is dead

Contact Velodyne, the replacment amp is not very expensive

Yes you do as this is were it gets the information from to play a bass line or effects from a film,if you dont have a amp or receiver you have a coffe table.
hope this helps.
CABLE GUY.

cheak setting in sterio out put for sub on ect does woofer have sperk wire going in and out use them then ok

Look for the sub pre out on the back of your amp and connect a sub cable to this and next to the LFE or phono type input on the back of the sub ,if it has two inputs left and right pick the left side ,set the cross over to suit your system and speakers,if you are not sure set the cross over to 80 hertz,this is a thx standard.
hope this helps.
CABLE GUY.