Ohm mismatches....
OK I know you can do 4ohm out into an 8 or 16 cab, but Ive got 2 4ohm outs on the back can I run one int oa 4 ohm cab and one into an 8 ohm cab simultaniously???
Don't let somebody elses world make yours unhappy...
It is always a bit ambiguous... In all probability, the *total* load must not be less than 4ohms - ie. 1x 4ohm cab, or 2 x 8ohm cabs (that's why there are two holes...)
(That is, unless you *know* the amp will drive 2ohms.... in which case it will take 2 x 4ohm cabs...)
edit: I'm assuming you are tallking about a solid-state amp here...
Last edited by AlanP2008; 3rd February 2010 at 06:35 PM.
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It kinda depends on the type of amp, the rated outputs, how they're configured etc
It will really help if you can tell us the make and model of the amp.
Originally Posted by nocaster
"It will really help if you can tell us the make and model of the amp."
Yes! Really!!!! in fact that information is vital and future posters please note an answer CANNOT be given without it!...........However........
Valve amps: Load within 25% of tapping value is safest. If you must, running a lower speaker impedance on the next tap UP is ok but with big amps, say 50W and up expect a fuse to pop now and again and valves to age faster.
E.G. amp set 16R load 8R ok.ish
amp set 8R load 4 ok, again ish.
amp set 4R load 8 or 16 not a good idea.
And for completeness. If you want to run bass guitar thru' a lead valve guitar amp, ok at bedroom levels but don't gig it.
Transistor amp: Max power is transferred usually when the load is at the lowest R suggested by The Book. Normally this will be 4Ohms but biggger, usually bass/PA amps will drive 2 Ohms..BUT ONLY IF IT SAYS YOU CAN!
You can take MODERN sstate amps as 4Ohm capable( and if they are of ANY kind of quality, bombproof) but many older tranny amps were rated only down to 8Ohms. I have a 100W (dream on!) TUAC so rated and my son's Traynor combo was 8R only.
If a tranny combo does not have an extension speaker socket you delve and connect at the amps peril.
Higher loads than 8 can be safely driven with power loss but DO NOT assume a sstate amp will live if you take the load off at full drive! Always, with ANY kit, plug up dead, re check, vols at min, turn on, advance vols' slowly watch for smoke!............And buy a cheap continuity/test meter f.c.s!
Do not, under any circumstances connect large low R transformers to the output of amplifiers. This is especially so for transistor amps.
Dave.
Its a boogie express...
Don't let somebody elses world make yours unhappy...
Then the easy answer is... do you really want to have to pay for a new output transformer at official boogie prices.
Sibella: He says he wants to go to Europe to expand his mind.Louis: He certainly has room to do so.
good answer...
Don't let somebody elses world make yours unhappy...
Can we sticky this? It comes up fairly often....
that would be a good idea - try and search and nothing comes up (when search is working ...)
Don't let somebody elses world make yours unhappy...
"Can we sticky this? It comes up fairly often...."
Fine by me, might want to let it run a day or so for errors, ommisions, and other views?
Dave.
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