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MC2 E45 amp ability to power 2 ohm circuit

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Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2020 at 1:05pm
" It just sounded attractive as the output power is higher"

Yes - it can be difficult to understand that more power might actually not lead to more SPL. Far better to add square inches (or centimeters) of cone!   Smile


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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipman725 Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2020 at 2:03pm
When you look at the full spec sheet you can see that this amp should be able to deal with 2 ohm load as the power output per channel has only reduced to 4100W even with a crest factor of only 2.8.

The choice of whether to run at 2ohms then comes down to how important maximizing the service life of the amp is for you compared to getting the most possible output power out of the amp.  The amplifier is rated for it but your still doubling the current in the output transistors and running parts hotter.  You could always run 6*8ohm drivers off each amp for 2.67 ohm per channel as a compromise.

To bother with 4ohm drivers to me is more about the driver than the amp, if its a super high performance 21" driver with a 6" coil you might want to consider 4ohm just to get the most out of the driver but if its just an average 18" 4" coil driver then the driver will already be thermally compressing and there will not be much gain by the potential doubled power on the voice coil (apart from a cooked driver).

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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2022 at 10:58am
Originally posted by Sinai Sound Sinai Sound wrote:

This was a 4 x 8ohm drivers per side (so 2ohm nominal), running the frequency you want to play, at loud volumes





One of the rare moments, Speakerplans Amp Forum, brings a smile to your face. LOL

EDIT : Would be very skeptical about MC2 E45, having the nuts, to pull 35A off the mains, even though it has higher rated output, at 2 ohms, than Inf 8 MK2..

Hmmm...


Edited by levyte357- - 04 May 2022 at 11:05am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2022 at 12:46pm
Correct, the infinite 8 MK2 is a far superior arc welder.
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2022 at 1:25pm
Originally posted by csg csg wrote:

Correct, the infinite 8 MK2 is a far superior arc welder.


Are you saying the MC2 E45 is a fantastic beast, that can produce power, without sucking current from the wall !?


I've "PERSONALLY" seen Powersoft K20, suck 34.9A from the wall, while powering 4x 8 ohm subs, so that amp is exempt from this type of argument, forever !!!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2022 at 5:05pm
Quite the reverse. The E45 will play music just fine. Want to rinse every last dB out of your dynamic range? Stick with the void.

Why anyone is interested in balls out performance into 2R both channels sub is beyond me. Power is cheap these days, go with something with plenty of voltage and keep to 8R. 
“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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Post Options Post Options   Thanks (0) Thanks(0)   Quote al_x Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2022 at 6:40pm
I recently borrowed a friends E45 to power two B&C 18ds115 on sub. It managed 6 hours in a hot room, 4ohm bridge on a 13a plug quite happily (playing drum and bass and jungle so a lot of long sustained bass notes)
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