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Conference napalm::guitar

Title:GUITARnotes - Where Every Note has Emotion
Notice:Discussion of the finer stringed instruments
Moderator:KDX200::COOPER
Created:Thu Aug 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3280
Total number of notes:61432

2659.0. "Amp external speaker jack installation?" by KNGBUD::DUBOIS (Bob Dubois LKG1-1/A15 226-7837) Tue Jan 12 1993 11:36

    I have a Peavey Bandit 65W. This amp has a single 12" speaker in the
    cab. 65W is more than sufficient to drive more speakers, but the amp
    does not have a jack for external speakers. My question is if I add
    a 1/4" jack can I splice into the wire that is coming out of the
    head now to the 12" speaker, or should I open the head and solder in
    a new set of wires from the original source for the jack. Are there
    any reasons I shouldn't do this at all? Are there any other things
    I would have to do other than splice/or run new lines to the jack.
    Any information/suggestions would be appreciated.
                              Thanks in advance!
                                    Bob
    
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2659.1FDCV09::GOODWINTue Jan 12 1993 13:1414
    It doesn't matter whether you splice into the wire or go into the amp.
    
    What does matter is that the total impedance load of all speakers is
    correct for the amp.  For instance, if your current speaker is 4 ohms
    and you connect another 4 ohm speaker in parallel, you'd be running
    the amp at a 2 ohm load, which could fry it.  If you connected the
    second speaker in a series circuit, the resulting load would be 8 ohms,
    which might (or might not) be o.k. for your amp.
    
    The fact that your amp has no external jack would lead me to believe
    that it is intended to work with the specific load of your current
    single speaker.
    
    /Steve
2659.2Check impedence firstABACUS::SANDERTue Jan 12 1993 13:2312
    Better find out first if the power amp can drive a lower impedence
    than 8 ohms. You could try calling Daddy's Junky Music, as they
    sell lots of Peavey stuff, or call the Peavey factory. The number is;
    
    1-800-821-2279       The Nashua Daddy's is 603-888-1160
    
    That amp has a Scorpion loudspeaker in it, no? The Scorpion speakers
    have terminals that you push down on to insert the speaker wires. You
    should be able to daisy chain your new wires for the external jack from
    these terminals.
    
    Ed
2659.3LEDS::ORSIThe Croco-Stimpy..HAPPY HAPPY!..JOY JOY!Tue Jan 12 1993 13:4314
     The Bandit 65 is 65 watts at 8 ohms. The total load of the cab
     shouldn't exceed 8 ohms, and that would give you a total of 4 ohms
     that the the amp sees. But, the Bandit isn't really designed for
     a 4 ohm load, but I know a few people who've done exactly what
     you propose, and haven't had any problems. A 4 ohm load could pose
     a problem if you play at high volume levels. The Bandit 65 doesn't
     have a very big heatsink to dissipate the extra heat generated by a 4
     ohm load. From what I understand, the Peavey Special 130 is basically
     a Bandit 65 with a 4 ohm spkr, but it has a large external heatsink.
     I own a Bandit and have considered putting in an ext spkr jack myself.

     Neal

2659.4thanks for your helpKNGBUD::DUBOISBob Dubois LKG1-1/A15 226-7837Tue Jan 12 1993 13:588
    Thanks for the quick responses. I called the factory number #2 provided
    and spoke to an engineer who recomended not doing it. He said the amp
    would run at 4 ohms, but it would heat the circuitry which would 
    probably shorten the life of the amp. So I guess I'll leave the amp
    as is.
    
                         Thanks!
    
2659.5NEEPS::IRVINESoldMySoulFerASausageRollWed Jan 13 1993 06:276
    re: .3
    
    The Peavey Special 130 claims on the backplate to be a 300W Instrument
    AMP, and has an additional speaker socket on the back.... 
    
    Bob
2659.6Hmmmm... that rig must be hotfooted... COOL!FRSBEE::ABATELLIWho knew?Fri Jan 15 1993 07:467
RE: 2659.5
A PV SPECIAL 130? The 300W = power consumption not speaker wattage. The Special
130 (I thought) runs around 130 watts with a 4 ohm load. No big thang, just a 
"minor" nit.

Rock on,
	Fred (who has a PV-MX combo that kicks out 130+ watts with an EVM)