Mc2120 speaker set up

Mc2120 speaker set up

Postby slatelacy » Sun Jan 05, 2014 2:26 pm

Hey guys. I just bought a Mac 2120 amp to start building a rig. I plan on a 2x12 cab with JBLs. My question is, what speaker Ohms are appropriate for this amp?
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Re: Mc2120 speaker set up

Postby Bobbyg » Sun Jan 05, 2014 3:12 pm

I think most are using 8 ohm JBL's; use one side of the 2120, wire the speakers in parallel and connect to the 4 ohm tap on the Mac.
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Re: Mc2120 speaker set up

Postby slatelacy » Sun Jan 05, 2014 4:40 pm

Thanks! Seems easy enough.
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Re: Mc2120 speaker set up

Postby hippieguy1954 » Sun Jan 05, 2014 4:47 pm

Yes, 8 ohm speakers, and if you want to push them more you can bridge the McIntosh and run it mono at 220+watts. That's what I do. If I had a 2300, I would only use one side at 300+watts.
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Re: Mc2120 speaker set up

Postby abrocktron » Tue Jan 07, 2014 10:23 am

You really should mention what jbls ure using. The E, s are the bad boys that weight around 60lbs ea and are rated at 300watts @ 8ohms. I've heard they blow around 400. The jbls will open right up if u can feed em atleast 50% of there rated watts n impedance.
Now with the K, s my personal fav. I think theyre rated around 115watts at 8ohms. D, s the same rating. If ure bridging your Mac I think ure model will send 240 watts out the right mono side. That would be ideal for one E120.
Post ure jbl starting LETTER.
Also I think someone mentioned bridging their mc2300 n thinking their sending 300watts. If 2300 was bridged it, s sending 600watts out right channel.
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Re: Mc2120 speaker set up

Postby slatelacy » Tue Jan 07, 2014 10:29 am

I'll be using 2 K's with the Mac amp.
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Re: Mc2120 speaker set up

Postby waldo041 » Tue Jan 07, 2014 11:28 am

abrocktron wrote:You really should mention what jbls ure using. The E, s are the bad boys that weight around 60lbs ea and are rated at 300watts @ 8ohms. I've heard they blow around 400. The jbls will open right up if u can feed em atleast 50% of there rated watts n impedance.
Now with the K, s my personal fav. I think theyre rated around 115watts at 8ohms. D, s the same rating. If ure bridging your Mac I think ure model will send 240 watts out the right mono side. That would be ideal for one E120.
Post ure jbl starting LETTER.
Also I think someone mentioned bridging their mc2300 n thinking their sending 300watts. If 2300 was bridged it, s sending 600watts out right channel.



If jerry used 3 - 300 watt speakers he would have a total of 900 watts available to him. Throw in a fourth and he would be sitting at 1200 watts. He would NEVER blow a speaker even if he did bridge the Mc2300 for 600-700 watts output. He would NEVER get anywhere close to actually breaking those speakers up. The truth is that both the E120 and K120 have 2 wattage ratings and only one of them is correct for the way he used them. The Continuous Sine Wave rating for an E120 is 150 watts and a K120 is 100 watts.

As for bridging, the amp has 2 inputs and 2 outputs, one set for each side of the amp making up two channel for stereo operation. Bridging the amp combines both outputs and switches to only one input since it has now created only one output. So when bridging a mac you are using the mac's right input but both outputs creating one channel or Mono operation. In stereo operation you actually have 2 mono channels.

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Re: Mc2120 speaker set up

Postby abrocktron » Fri Jan 10, 2014 3:52 pm

Solid state amps 99% of them dont like low impedance combos. Thats what makes the macs so unique. Tube amps love low impedance n feed off them with their tube amplification.
The rocktron specifically states in their manual they dont recommend a 2by12 8ohm combo wired in parallel bringing the imp. to 4ohms. The rocktron native output and what it loves best is an 8ohm load. They state if ure runnin a 4ohm bridged rocktron it will spit out 171watts n at 8ohm it pumps 150watts. I run two k's out out v300s dual output channel one. bridged at 8ohms per output jack . Sounds great and opens up the k nice n sweet.
For my e120 setup I have waited n waited for years to build my four by 12 vert cab to use with my mac. The beauty of the mac is it can be tapped as low as .5. I installed two red banana jack for positive only. I have 6 jbl s 2k's for v300 and finally got my fourth E. All were from auctions no recones n brand spankin new out of orange cardboard box with dummy plugs inside the push connector holes.
I have been using 3 E, s in parallel requiring the 2ohm tap. Now finallly I can use my 1ohm jack to fuel my four 8ohm E120s. All jerry 2300 mods have been done especially the sentry monitor terrible feature. gnd is just left bare wire to Com.. I did a several mnth mc2300 upgrade including favouring right side n added 47000 uf output caps. I just left the mylar caps alone.
My 2300 never goes past 5 at craziest volume while practising in an out of bizz movie theatre.
Goto doctorproaudio.com/doctor/temas/powerhandling.htm .
From ancient swept zinewave power tests holds no real meaning. It is simply half of the speakers capability.
So let me get this straight. Jerry never blew speakers??????
I rate my k's at 150 n I push em hard so you can actually get them to pulse in and out. Keeping the max on my modded rocktron at about at about 7 of 10.
Will post pics soon of my 4by12 open back vert birch cab runnin at 1ohm wired in parrallel.
Thank again waldo ure tpc-1 n brad n fyd for making the killer preamps.
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