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[ryan alli]

I recently built a new t18 box for my evx180b subs with these specs  http://www.nrgrecording.de/html/t18.html Problem is, they sound great at lower volumes (150-200 watts) but at a little higher volume they sound all distorted! (500 watts). I tried using a new evx180a I had lying around and it did the same thing! Any suggestions?

[Ivan Beaver]

Saying that it sounds like garbage really doesn't give much to go on.  Maybe if you could tell us a bit more aobut how it really sounds-for example-slapping sound-cracking sound- floppy sound-no bass- no highs (in the bass range)-distorted and so forth.

It oculd either be the cabinet or the driver or a combination.

[Paul O'Brien]

The EVX180B is not a sub driver by modern standards, and the T18 isn't much of a subwoofer with response that only extends down to 50hz, so maybe you are expecting more than this design is capable of delivering.

[ryan alli]

its a flopping sound

[Ivan Beaver]

ryan alli wrote on Mon, 30 August 2010 19:53

its a flopping sound

Where do you have your highpass filter set?  You may be driving below its tuning. All loudspeakers will flp around when you do that.

[John Halliburton]

Ivan Beaver wrote on Mon, 30 August 2010 21:30

ryan alli wrote on Mon, 30 August 2010 19:53 its a flopping sound Where do you have your highpass filter set?  You may be driving below its tuning. All loudspeakers will flp around when you do that.

Or there is a leak in the cabinet.

John

[Tim Weaver]

Congratulations! It sounds like you built the T18 correctly because thats what they usually sound like....

Its really a bad, bad loudspeaker and could never be called a real subwoofer.

[Jimmy Wright]

+1
Set Highpass, check for air leaks, build something else

Try a T48 from Bill Fitzmaurice

[Kevin Unger]

Tim Weaver wrote on Fri, 10 September 2010 07:04

Congratulations! It sounds like you built the T18 correctly because thats what they usually sound like.... Its really a bad, bad loudspeaker and could never be called a real subwoofer.

Heard/Built one?


I have an AT here loaded with the recommended TangBand 8inch and it sounds great in a car, with very little power.

Replaced two kenwood 10 inch "subs."  


t18 is a tiny sub designed for small rooms and to be corner-loaded. I don't get all the BFM knocking on here, when all the cabs perform as the graphs show on his site; and allow us diy'rs to build tested, easy to build cabs with a budget in mind.

[Art Welter]

Kevin Unger wrote on Sun, 26 September 2010 20:50

Tim Weaver wrote on Fri, 10 September 2010 07:04 Congratulations! It sounds like you built the T18 correctly because thats what they usually sound like.... Its really a bad, bad loudspeaker and could never be called a real subwoofer. Heard/Built one? I have an AT here loaded with the recommended TangBand 8inch and it sounds great in a car, with very little power. Replaced two kenwood 10 inch "subs."   t18 is a tiny sub designed for small rooms and to be corner-loaded. I don't get all the BFM knocking on here, when all the cabs perform as the graphs show on his site; and allow us diy'rs to build tested, easy to build cabs with a budget in mind.

Kevin,

The T 18 bass box referenced in this thread is a lousy bass box made by EV, not a lousy BFM box.

BFM's graphs would be much more believable if they were not hand drawn.