Subwoofer Amplifier for TC sounds LMS 5400 ultra 18" for 240v (1 Viewer)

[Jason Charlton]

Damn. She's a beaut!

Congrats.

 

[Robert_J]

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

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?

 

[William Brack]

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:

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?

 

[William Brack]

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

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

 

[Robert_J]

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.

 

[William Brack]

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

 

[Robert_J]

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.