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Joe Bonamassa Forum → Joe's Guitars, Amps and Gear → evm12l's
just wondering loaded set of evm12l's in a cab and they really ate up my head room have to run 100 watt head wide open to get to a gigging level anyone else experience this or can shed some light on this subject went with speakers because lots of artists swear by them just didn't expect to lose that much head room thanks congrat's to joe b. for classic rock award
HOW HAVE YOU WIRED THE SPEAKERS ? AND WHAT IMPEDANCE ARE THEY ? DEPENDING HOW THEY ARE WIRED MAKES A DIFFERENCE ON HOW MUCH POWER IS PUT TO EACH SPEAKER
IS IT A 4X 12 OR 2X12 ? THE EVM12L IS A POWERFUL SPEAKER THAT LETS THE AMP HAVE ITS NATURAL VOICE IT SHOULD NOT AFFECT YOUR HEADROOM.
its a splawn quickrod basically plexi/jcm800 rolled up in one 2x12 avatar cab two 16 ohm cabs wired mono and amp is set 16 ohms
sorry i mean 2 16 ohm speakers
OK BY MY CALCULATIONS THE ONLY WAY TO WIRE THESE IS IN PARALLEL IF YOU WIRE THEM IN SERIES THE LOAD WOULD BE 32 OHMS AND YOUR AMP WILL ONLY HAVE 4,8,16 OHMS CHECK THEY ARE WIRED IN PARALLEL WHICH WILL GIVE YOU 8 OHMS AND MAKE SURE YOUR AMP IMPEDANCE IS SET TO 8 OHMS
thats correct right now i have amp on 16 ohms and each speaker running out of each output so to seperate 16 ohm speakers
Run the Speakers Parallel. 2 - 16 ohm speakers = 8 ohms when run parallel. Set the amp to 8 ohms.
did that already i'm sending amp back to splawn tomorrow just doesn't have the power my old marshall did sounds good other than that i tried it with a marshall 4x12 cab 16 ohm cab the got the same results thanks
thats correct right now i have amp on 16 ohms and each speaker running out of each output so to seperate 16 ohm speakers
i understand you use both speaker outputs
and connect each to a seperate speaker of your cab??
Is your cab stereo? Use only ONE output of your amp.
If your EVs are wired parallel then connect this ONE
speaker cable to your cab and set the splawn to 8 ohms.
You will be amazed at the headroom.
Alex
I agree with Alex.
Out of personal curiosity I downloaded the Splawn manual - not very helpful as it gives no clue how the two speaker outputs are wired. They could be in parallel (most likely) in series or even be wired to switch the transformer tap when both sockets are used.
I have an old Fender concert and that automatically selects a different output transformer tap (same idea as the manual selector) when you plug a second speaker in - but both speakers/cabs have to be 8 Ohm - I think it puts the sockest in parallel so it will select the 4 Ohm transformer tap.
On most Marshall amps the two speaker outputs are wired in parallel so if you use two separate 16 Ohm cabs (or speakers in your case) then you need to set the output selector to 8 Ohms. Far easier and cheaper to wire them in parallel in the cab and then you know exactly where you are, as Alex said.
Sorry to repeat what others have said but using the amp with the wrong impedence selected wil not do the output transformer any good and the same applies even if you ditch the Splawn.
Pete
I agree with Alex.
Out of personal curiosity I downloaded the Splawn manual - not very helpful as it gives no clue how the two speaker outputs are wired. They could be in parallel (most likely) in series or even be wired to switch the transformer tap when both sockets are used.
I have an old Fender concert and that automatically selects a different output transformer tap (same idea as the manual selector) when you plug a second speaker in - but both speakers/cabs have to be 8 Ohm - I think it puts the sockest in parallel so it will select the 4 Ohm transformer tap.
On most Marshall amps the two speaker outputs are wired in parallel so if you use two separate 16 Ohm cabs (or speakers in your case) then you need to set the output selector to 8 Ohms. Far easier and cheaper to wire them in parallel in the cab and then you know exactly where you are, as Alex said.
Sorry to repeat what others have said but using the amp with the wrong impedence selected wil not do the output transformer any good and the same applies even if you ditch the Splawn.
Pete
Thanks Pete! Good explaination.
For me its difficult to explain even in german. 
Alex
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