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Achat 112 SUB - Which amp / advices
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bivan84 View Drop Down
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    Posted: 07 February 2026 at 12:22pm
Hello.
I put together a little system with 2 of them, coupled with Montarbo 210 sat (B&C 250AMX woofers and B&C 1" Horn), all amplified by a t-amp E4-250 with a DCX2496 crossover.
The two Montarbo's are very sensitive and the two 112 work hard with that setup to follow them.
Can I have an advice to make the sub more "present"?
Does that amplifier is sufficient to power them?
Thanks!
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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2026 at 12:48pm
You are obviously under-powering the subs!

Minimum for those would most probably be something like the E-1200 or E-1400 (sticking with Thomann amps). Or the TA/TSA series. I'm really not sure what difference there is, but Thomann do give a no quibble 3 year guarantee, so worth a gamble.   Smile
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bivan84 View Drop Down
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Points: 36 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bivan84 Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2026 at 1:37pm
Thanks.
I do not know if the speaker would survive to that amount of power :-)
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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2026 at 3:05pm
Why do you say that? The speaker is rated at 350W. Do you think that is an exaggeration? In any case having 1,5 - 2 x rated power is standard. You can always limit the power going to the speakers with the DCX. It's always better to have a bit of headroom & avoid sending a clipped signal to the speaker. I think that sending square waves down the line is the most common cause for failure!   Smile
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bivan84 View Drop Down
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Points: 36 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bivan84 Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2026 at 3:19pm
I was thinking that 990 W on 4 ohm of the t.amp E-1200 was too much for it...

Edited by bivan84 - 07 February 2026 at 3:19pm
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Ok, remember that the 990W quoted is at 1kHz, downhill, with the wind behind it!!   LOL LOL LOL 

And likewise the 4ohm thing. The impedance of the cab will vary with frequency & most likely only be 4 ohms over a narrow band. You won't really know unless you do the measurements or Thomann can provide the graph. Not too likely, really. 

In any case, they do say that the thing will stand up to 1400W peak, whatever that means.   Smile

I'd say, always use the biggest amp you can afford, set your limiters - and use your ears!   Big smile

Good luck! 


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njw View Drop Down
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Points: 2700 		Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2026 at 11:12pm
  The easiest and cheapest solution would be to knock the mid/tops down a few db's on the DCX or even run some overlap between the bass bins and tops, this obviously won't improve the overall SPL. Personally, I'd add another pair of the Achat 112's, run the four of them from the e4-250 and then power the Montarbo's from another amp that does around 300w/side into 8r as from what I can see the Montarbo's are considerably more sensitive than the Achat 112 subs.
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Points: 36 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bivan84 Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2026 at 11:26am
Originally posted by Earplug Earplug wrote:

Ok, remember that the 990W quoted is at 1kHz, downhill, with the wind behind it!!   LOL LOL LOL 

And likewise the 4ohm thing. The impedance of the cab will vary with frequency & most likely only be 4 ohms over a narrow band. You won't really know unless you do the measurements or Thomann can provide the graph. Not too likely, really. 

In any case, they do say that the thing will stand up to 1400W peak, whatever that means.   Smile

I'd say, always use the biggest amp you can afford, set your limiters - and use your ears!   Big smile

Good luck! 



Understood, very clear. I will try to power them with a powerful amp.
I have available an old Samson SX1800 which is rated to 2x600 on 4 Ohm just to see their behaviour.
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bivan84 View Drop Down
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Points: 36 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bivan84 Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2026 at 12:23pm
Originally posted by njw njw wrote:

  Personally, I'd add another pair of the Achat 112's, run the four of them from the e4-250 and then power the Montarbo's from another amp that does around 300w/side into 8r as from what I can see the Montarbo's are considerably more sensitive than the Achat 112 subs.

Yes, that would be a reasonable solution. I do not know if that E4-250 will run happy with 4 ohm on all four channels.
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Points: 7752 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2026 at 1:20pm
Ok.

Another pair of cabs is a good idea. Better to spread the load & not push your cabs to death. You could always use the Samson with 4 cabs, but with each pair wired in series instead of parallel.   Smile

In any case, yes give the bigger amp a try & see what you think. It may give you a few dB's more.
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I have a very similar setup, a pair of sherman R2m's and a pair of the 112's and drive them with a E4-250, I have also driven them with an E-1500. Have you removed the passive crossover? That improved output in my experience. I would add another pair before looking at a more powerful amp
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Originally posted by James Tengo James Tengo wrote:

I have a very similar setup, a pair of sherman R2m's and a pair of the 112's and drive them with a E4-250, I have also driven them with an E-1500. Have you removed the passive crossover? That improved output in my experience. I would add another pair before looking at a more powerful amp

Thanks for sharing! Yes, I have removed the internal crossover and redo the cabling for accepting a 4 pole speakon to link the Montarbo's on the TOP output, using one cable from the channel 1 and 3 of the E4-250. Yes, they sound better without the internal 6 db/oct filter.

You find the E4-250 appropriate for that use or is limited?
Any suggestion for filter or equalisation? I simply use a HighPass 24 db/oct at 35 hz and the top are crossed at 150 Hz.

EP1500 could drive the 112s without hurting them?
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