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Old 3rd April 2012, 05:20 PM   #1
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Location: Vantaa, Finland
Default Proper power for 2 THAM15's

Hi guys (and gals)

I have just ordered all the plywood, hardware and paint to build 2 THAM15's for PA-use, and 2 more probably in a few months, if needed ;-)
I am going to use either the 15TBX100 as originally spec'd, or the 15PS100 because of the lower price. The sim looks very similar using either one, but of course I get a higher max SPL with the TBX.
The music is not dubstep or sinewaves, just "normal" rock and ballads, but we do have a 5-string bass, and of course the kickdrum.
We play for audiences around 2-300 max, and mostly indoors, but would also like to cover 300 outdoors. 100 dB at the middle of the dance floor (10 m/30 feet out) is our normal level.

Now to my question : what amplifier-power do I really need to drive these beasts optimally, and what can they really take before smoking/X-Maxing ?
The PS100 takes 700W cont, 1400W max, and they are 8 ohms, so what I was looking for was an amplifier for 1400W @ 4 ohms because I am going to use them in parallel. Or do I need an amp with 2800W @ 4 ohms because that is what the drivers actually can take ?

I already have a Powersoft Q4004 (4*600W@8 ohms) for the tops (Stereo-biamp) so another light-weight would be nice.
I also thought about having another Q4004 for the subs but it gives "only" 4*1000W@ 4 ohms or 2*2000W@8 ohms bridged so I could wire the subs so that I drive them from their own channel, then they would get 2000W each.

Any input on this would be great, and regards and thank You for Your help
Magnus
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Old 4th April 2012, 02:03 PM   #2
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Quote:
Originally Posted by MagicJohansson View Post
I am going to use either the 15TBX100 as originally spec'd, or the 15PS100 because of the lower price. The sim looks very similar using either one, but of course I get a higher max SPL with the TBX.

Now to my question : what amplifier-power do I really need to drive these beasts optimally, and what can they really take before smoking/X-Maxing ?
The PS100 takes 700W cont, 1400W max, and they are 8 ohms, so what I was looking for was an amplifier for 1400W @ 4 ohms because I am going to use them in parallel. Or do I need an amp with 2800W @ 4 ohms because that is what the drivers actually can take ?
Get enough power to push the speaker you choose a bit over what the sim says it takes to hit Xmax.

Better to have too much and set limiters than not have enough to drive the speakers to their potential.
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Old 9th April 2012, 12:17 PM   #3
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Thank You for the reply.
The "Better to have too much" I know, same goes for Your car :-)

I ran a few "Max SPL" simulations in Hornresp and (if I understand this correctly) found out that with 700W I can have 126 dB at 92 Hz limited by power and at 58 Hz limited by XMAX.
But then with 1400W (what the 15PS100 can take max) I can have 126 dB also at 42 Hz, with 700W only 121 dB. Doesn't this mean that if I have an amp with 1400W I can EQ the box to give more 42 Hz ?
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Old 10th April 2012, 09:50 AM   #4
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They take a kilowatt for extended periods. No problem.
Some highpass at 30 - 35 Hz and dont push the amps into hard clipping.

Johannes.
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Old 10th April 2012, 10:11 AM   #5
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Quote:
Originally Posted by Circlomanen View Post
They take a kilowatt for extended periods. No problem.
Some highpass at 30 - 35 Hz and dont push the amps into hard clipping.

Johannes.
Ok, thanks.

I just got hold of a used QSC PLX3402 that can push 3400W into 4 ohms when bridged so I suppose that would be ok for a pair.
And yes, I am going to highpass and limit, I have a Omnidrive as processing for the PA so I have all possibilities.

Thank You guys for Your help
Magnus
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