More Bass Is there some known defect w/ this unit. The Bass control really does not change the sound whether it is 1/2 way or all the way. Just for info. The rear surround channels on this unit DO NOT have any bass information. The manual calls this out. Is this unique? Thanks for input. CK

That bass combines passive EMG pickups with an active preamp (which provides the bass and treble controls). Sounds like you are never getting the preamp to work, and if that is the case there could be numerous reasons...a dead battery...jack wiring that is broken (meaning the battery ground wire is not attached or is grounding out)...likely should see a tech, but that is a good sounding bass when working correctly.

Always make sure that your computer settings for audio are checked and set accordingly and that all the equlizers and audio programs that are installed and controlling your audio sound output are accounted for and adjusted properly.

Hi,
Try to exchange one speaker connections only, unplug connector from speaker and put them + to - and - to + pins.
In my opinion, both speakers are giving out of phase sound that cancels the bass sound, speaker connections should be same phase to get bass sound so just change connecting two wires at any one speaker, that will work.
Thanks.

navigate to control panel, select sound and audio devices. select advanced the volume control appears then set the balance to be at the center the on the other advanced option, select desktop stereo speakers. thanks.

Assuming that the amplifier is functioning properly, I suspect that the problem is either in the cord, the plug socket on the bass, or the volume control potentiometer. First, I would try another cord that is known to be in good condition (ALWAYS plug the cord into the instrument FIRST). Second, carefully remove the cord receptacle plug from the bass and examine the solder joints (check for loose wires). Third, carefully remove the plate that holds the volume and tone pots. Examine these controls for loose wires or faulty solder joints. CAUTION: If solder joints are found to be the culprit, care must be taken to correct this problem. If too much heat enters the pot, it can be ruined!

Hello billyelder,

If the amp is powering up but not producting any sound, there are 4 possible causes.

1) Incorrect or faulty wiring.
2) No input or input too low for the amp.
3) Defective speakers.
4) Incorrect amp or head unit settings.

Start by checking all of the wiring and onboard fuses. Especially check the speaker wiring and make sure there are no shorts or grounds and that the insulation is not nicked or frayed. Check the RCA cables by substituting a known good pair. Check the receiver (head unit) to see if there are any settings that need to be turned on for the preamp outputs to work.

Test the speakers on another output to determine that they are functional.

Check the amp settings and insure that filters, crossovers and gain controls are properly set. If your wiring and the settings all check out and the speakers work on another output, the amp itself is probably defective.

Hope this helps.

Hello korre,

Low output could be the head unit, the speakers of the amp itself. Start by isolating the problem.

1) Test the sub(s) on a known good output.
2) Input a known good signal. A portable with RCA preamp outs will work OK.
After you have eliminated the other components, troubleshoot the amp itself:

1) Check the onboard fuses. The M605 has 2 each 30A fuses just to the left of the power and ground terminals.
2) If it was just installed, then my first suspicion would be a problem in wiring. If one tiny little strand of your speaker wires comes into contact with another wire or ground point, it could present just enough of a signal path to ground out most of your power, and perhaps still allow the amp to seemingly operate normally (at least for awhile). Check power and ground too.
3) Make sure your head unit RCA's are plugged into the inputs and not the outputs.
4) Check the low-pass and subsonic filter settings. If low pass is turned all the way down, the amplifier would ONLY send frequencies below 30Hz to the speakers. Subsonic turned on and the low pass all the way down would effectively result in no sound.
5) Remove the top cover to access the mode controls and display. Check the input level.

If everything checks out, the amp probably has a defective component and needs factory/service center repair.

Hope this helps.

Are you sure you don't have any shorted wiring or defective speakers?

Try moving the unit away from power sources, for examples power adapters etc. The noise it is probably because of a faulty transistor or IC in the AMP section of the device.
To fix this you need to take unit apart and test components on the Amp area of the board, as this happens with all devices it is the final amp section having troubles.
Strange thing that device restart normally after this.