Tried reversing input L and R, not much there. I suspect a short as develloped in the wire comming out of 1/8 plug wich goes in the laptop. There was a bad 90 degree bend. Humming sound comming out of the woofer section, even if I unplug both inputs. I opennned the sub to look at the board, no sign of broken wire and no funny burned smell, everything on the board seemmed ok. Could it be the transfo (double output 11 V. and 2 V. ) ? didn't have my meeter close by.
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Either there is NO bass on the recordings (if you listen to it with headphones does it have bass?) ...OR...you've wired them out of phase. Connect only one(1) Bose 901's to just one side. Is there bass? Then connect the other side. IS there bass? If not reverse the phase (+ /- connections) and see if the bass comes back. Once that is done and there is BASS, then add the 3rd and then the 4th speaker. .Are you sure your Sansui can handle a lower than 4 ohm load???
Does your M foot switch work on the Fender? If you know how to use a multimeter you could check continuity by putting meter leads on plug of M foot switch(1 on tip, 1 on sleeve ) You should see a change in the multi meter when you depress switch. If so switch is good. Another easy test is with cap off a spare 1/4 plug -plug it in to foot switch jack.put a alligator or some such metal clip or wire and join(called short or shorting) the two inputs . If connecting and unconnecting results in switching then the foot switch is suspect. One fairly common thing is that foot switch and input jack are often sautered straight to a circuit board to save $ on production cost. Used to be all point to point where a wire was attached to 1/4" input and then wire went to circuit board or tubes. The wire has give, but not so with direct wiring to board. So the nut holding the 1/4" amp input gets loose(doesn't have to be loose for the following to happen) and a pull on the chord causes a break in the soldier and thus a break in the sound chain. Sometimes it will work intermittingly by putting a little pressure left, right, up or down on the plugged in plug. If so, it's the input jacks connection to the amp. If not it still could be that because putting pressure on plug may not be sufficient to affect a temporary reconnection. Since switch(the new one you made)works on Fender, but not Marshall I suspect the jack or foot switch circuitry past the input jack. If using some of the above the above tests leads you that direction,remove housing(unplug a/c power 1st ) inspect jack,wiggle it slightly see or feel a break then resodier from back side. You should be able to use the soldier already present without adding extra.
2 wires plus ground needs a stereo 1/4 plug. Don't know Mark 4, but Mark 3 has 2 button fs with 3 wires plus ground. Schematic here: http://el34world.com/charts/Schematics/files/peavey/peavey_mark_3_bass_with_pa.pdf
shows 3 wires plus ground. Stereo plug does not have enough connections, only ground plus 2 wires.
Count the pins of socket and find DIN plug with proper pin-out for socket. Search google for DIN plugs.
Verify the module by connecting a different pad to the bass drum and see if you can trigger the bass drum sound. This would test the module. Now connect the bass to a different input and see if it will trigger that input. SOME of the triggers have a very small potentiometer in them. I have seen vibration break this pot loose rendering the unit inoperative. Also some people have pushed a screwdriver into the pot too hard and broken it off. Once you know it is the bass trigger, open the unit and look for damage. The sensor is usually a piezo disk. These can break away from their attachment. Reattach with contact cement after cleaning the residue.
Wiring harness connector to the power tube section is fried. A common problem with all bugera amps and many other companies also. A cheap fix. You can order the part you need from newark.com or call 1-800-4newark the part number is sku#85c0290 mfr#09-91-0500
Make sure that your speakers are plugged in correctly and wires aren't shorting out. also try plugging your equipment into another input on the unit. Make sure the any switches on the Bass unit (subwoofer/Amp) are switched on. Good Luck!
My only experience with faint sounds is when ground wires in the particular circuitry are not property connected. That means tracking the wires from the one end to the other if you can get to them. If they are not embended in a casing or housing I would change them.
Also, try changing the RCA plugs; even their connection can cause the sound shorting if there is a short.