I have a Peavey Mark III XP series Bass head, I play through a cabinet with (1) 18 '' and (2) 10 Inch speakers, never had a problem, but last nioght, it just shut down, sounded llike a blew a speaker, but we checked that and it is ok, what happened? It powers up, with little ''distorted'' volumns.
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Re: Peavey amp shut down
The output stage has a problem. From your description, I'd guess that the high voltage supply has failed. The low volume and distortion suggests that you are trying to power the speakers from the driver section rather than the outputs. There is a resistor that fails in some of this series. If I remember correctly it is either a 2K or 3K resistor 10 watts in size. If you have no experience with repairs, I'd seek a service shop that is familiar with these units. The part runs between $5-$10.
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Check continuity on all cables, try a different cabinet with the head and a different head with the cabinet and the bass with a different rig to see which part of the chain isn't working, make sure the volume controls are turned up on both the amp and bass. Once the problem is narrowed down it will be easier to advise you.
Relay?? I've never seen a guitar or bass amp with "speaker protection relays"...usually they're either on or off. Check the simple stuff 1st...is speaker cable from head to cabinet and/or the input cable from bass to the amp good? Check the "Direct Out" for a line level signal (must be connected to a PA or other amplifier) as this is your preamp out signal. Also, plug a shielded cable from "Effects Send" to "Effects Return"...this will verify "effects" loop issues if any. Lastly, vibration test...use a clenched fist across the top, sides and bottom of wood cabinet to lightly "jar" the internal circuits. If it starts working even for an instant, I would suspect intermittent connection inside.
What kind of problem are you having with this, I assume impedance matching. 2 speakers in parallel cut impedance in half. ex. 2 x 8ohm in parallel equal 4 ohm. IF the same speakers are in series, they double impedance, ex. 2 x 8ohm in series equal 16 ohm. Now matching 2sp and 2 sp, both pairs SHOULD be wired the same and the removal of 2 (dep on config) usually would be treated as 1 ?ohm circuit that equal the other ?ohm circuit. AFTER the removal of 1 leg, the impedance could double or half, depending on configuration.
Recommend an Ashdown or Fender with a 15" speaker, they will give a good sound, are gig-worthy, and will last. I use a Behringher 120W for rehearsal work, it only has a 12" speaker and thus cannot give a good 'presence', also I have been reliably informed, a lot of custom chips are used in thier amps. Don't forget, a bass 'E' goes down to something like 60Hz, and a good speaker and amp are a must for bass work
Check to see the phasing of the two cabinets and the cable. Take a 9 volt battery and touch it to the end of a cable that is plugged into the cabinet. The + of the battery has to be on the tip, and the - to the sleeve. See If the speakers move outward. Check each cabinet if they do then they ae in phase. Now try it with the second cable the results should be the same. If not and they move in the opposite direction then that cable is wired wrong. If one of the cabinets move in the opposite direction than the cabinet is wired wrong. You can also run one cabinet at a time if they sound louder by them selves that should also tell you that something is out of phase.
You CANNOT power 4 total 4 ohm speakers from this unit without special configuration. The lowest you can go is 4 ohms per side, which would be one 4 ohm cabinet per side. You would have to do a series parallel arrangement with the resources you have... two Peavey's in series and that combination in parallel with two 15's in series...
This is a VERY unsafe configuration with this mixer. ALSO please read my tip on here in regard to PMP mixer grounding hazard of the A channel when using Speakon to 1/4 inch cables.
Frankly, forget about maximum performance unless you want to risk blowing your mixer...
If I were you, I would put the two 15's in SERIES as 8 ohms on one of the channels and the Peavey's in SERIES as 8 ohms on the other channel.
You would be well to heed this warning as I have repaired a bunch of these units. Be careful of any poor speaker connections as there is an insulation breakdown problem in the power amp circuit board if a speaker becomes intermittent. If something fails DO NOT replace the pwer fuse as you will do more damage.
Changing the speaker MAY turn out disappointing results. There is a limit what you can get from a 12 inch speaker in the bass range. USUALLY the amp manufacturers match the speaker/cabinet/and amp for about the best performance that can be expected. Want more bass? Step up to a 15 inch speaker.
You can, however a bass speaker cabinet will NOT handle the higher pitch sounds needed for cymbals and snares, etc. You would connect it to the return AND doing so would DISABLE the other inputs of the bass speaker cabinet.
If you want both a guitar and drum machine into the cabinet, you need at least a small mixer or a speaker cabinet that can take two channels input simultaneously.
Plugging into the "return" of the cabinet DISCONNECTS the power amp from the preamp section in the cabinet.