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Subwoofer Amplifier for TC sounds LMS 5400 ultra 18" for 240v

Subwoofer Amplifier

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26 replies to this topic

#21 of 27 OFFLINE   Jason Charlton

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Posted September 18 2014 - 05:06 AM

Damn. She's a beaut!

 

Congrats.


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#22 of 27 OFFLINE   Robert_J

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Posted September 18 2014 - 07:33 AM

oh its amazing!!!!   at normal listening volumes, there isn't even any delay in the bass notes.  it sounds like its coming staight from the main speakers.

but once its moving about 2 inches, there starts to be a SLIGHT lag,  but wow,  it sounds amazing.

oh and i did end up buying the XTI4002 amplifier,  i've tested it at 3200w RMS, all the way down to 30hz,  i havn't tested below that yet.  but will get on it soon.

i have noticed just how much the sealed box detrements the lower end.  if i had my time again i would go with a slot port.  however i have DSP, so i can equalise it so its completely flat :D

I had the same problem but I used the parametric EQ in my Behringer BFD to get a flat response to 17hz.  I pulled down an inductance peak and boosted the low end.  It only took 4 or 5 filters. 

 

What are you using to measure your in-room response?



#23 of 27 OFFLINE   William Brack

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Posted September 19 2014 - 07:39 PM

i was just using a callibrated mic from parts express,  but one of the guys i work with doesnt think its quite correct in its measurement.


This is what its showing up as:
Screen Shot 2014-09-19 at 11.16.40 AM.png



but the SPL in the room doesn't sound like its dropping that much,  so i'm not sure whats going on there.....
how would you recomend measuring the sub?



#24 of 27 OFFLINE   William Brack

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Posted September 19 2014 - 08:43 PM

when i stick the Mic right up to the woofer it comes up like this:

Screen Shot 2014-09-20 at 2.40.41 PM.png


still dont think its quite right though.....



#25 of 27 OFFLINE   Robert_J

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Posted September 24 2014 - 05:10 AM

I'm still learning how to use my PE mic so I'm not much help.  I hate to send you to another forum but the DIY guys are hanging out at AVS now.  They will be able to answer your question about the in-room response.



#26 of 27 OFFLINE   William Brack

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Posted September 29 2014 - 10:19 PM

i worked out what was wrong,  REW had corrupted itself.  and had screwed up its output tones.   here is a new measurement.  yet to be equalised,  and in a 4cubic foot box.  practically flat to 20hz,  with -3db roughly at 18/19hz.  not bad for a medium sealed box :D

image001.png



#27 of 27 OFFLINE   Robert_J

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Posted September 30 2014 - 07:04 AM

That's a great response curve.  I know it will get loud and still sound great.  You are in the 'world class' bass range now. 







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