Speaker tech question

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dj Vecchio

New Member
Hello every 1
I was wondering if it is possible to run 4 passive speakers with 1 amp without over working the amp or the speakers? If this is possible how would i set it up? I guess i am wondering if I was to run 2, 8 ohm speakes with the same amp per side would that bring the ohm down to 4 ohms?
I guess i need to know do i run them in parallel or in series and then how do i set that up?
Ans yes my amp is rated to run at 4 ohms
it is a qsc plx 3002

any help would be appreciated

ty
 
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dboomer

Member
Most decent amps will handle a 4 ohm load without difficulty. Just run the pair of speakers per side in parallel. Generally speaking running speakers in series is problematic.
 

NickyB

Gear and Equipment Moderator
This will depend on whether or not your amp can handle the load impedance. How you wire the speakers to the amp's output will affect that. Most cabinets when connected together will by default be wired in parallel which will halve the impedance (i.e. two 8 ohm speakers in parallel will yield an overall impedance of 4 ohms). Adding a 3rd 8 ohm speaker will take it down to 2.6 ohms, and a 4th would take it down to 2 ohms. Keep in mind that IMPEDANCE is frequency dependent ... the speaker's impedance may average 8 ohms but in reality it varies and this is where the problem occurs. As the load may get down close to "0" ohms at some frequencies, zero ohms is the equivalent to connecting a piece of wire across the amp's output terminals which most likely will damage the amp. It'll shutdown or "smoke it" (i.e. burn it up).

There are alternatives like series-parallel hookups but these generally require either rewiring the cabinets internally or rebuilding some cables.
 

Conanski

Active Member
I was wondering if it is possible to run 4 passive speakers with 1 amp without over working the amp or the speakers? If this is possible how would i set it up? And yes my amp is rated to run at 4 ohms it is a qsc plx 3002
Yes it's possible and there is no danger to the amp or speakers as long as the latter can handle the power generated which will be about 450w per speaker.

If the speakers have dual speakon or 1/4 inputs on the back then you simply run a cable from the A and B outputs on the amp to the first speaker on each side and then another shorter cable from the first speaker to the second speaker. If the speakers don't have dual inputs then you just make both connections right at the amplifier.
 

dj Vecchio

New Member
Awesome help guys
I thought that, the way you explained it was the correct way to set it up and i have done that in the past with out any issues but i wanted to be sure before i blew something up

again ty


Have a nice weekend
 

Ken Heath

Super Moderator...da-ta-daaa!!!
Staff member
This should help...


Contrary to popular belief, all audio gear runs on special factory-installed smoke, when you allow that smoke to escape, the item no longer functions...Simple!
 
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