DIY Subwoofer

[ram87007]

HI Everyone Has anyone done a DIY SUB using Klipsch 18" Pro drivers????? I have Cornwall mains and need something to keep up with them size means nothing BIGGER IS BETTER when it comes to SUBS

[Jay481985]

pro driver subwoofer make for poor subwoofer.... just because it is a 18 inch woofer does not mean it can go as deep and as low. A pro speaker usually does a full range or a big range, much larger than just the 0-80 hertz range.

[DrWho]

Not DIY, but Klipsch Pro Cinema has just what you're asking about:

http://www.klipsch.com/products/details/kpt-884.aspx

Keep in mind that the posted specs were taken in 1/2 space. You can expect a lot more output down low in an 1/8 space environment. I believe these cabs are tuned to 19Hz? So worst case scenario you can EQ out to 19Hz, but I really don't think that will be necessary.

Just outta curiosity, are you interested at all in tapped horns?

[TheEAR]

What DrWho pointed will do the trick. If you will build a sub then seek the AVSforums...there is a DIY section there.

The sub pointed by DrWHO should keep up to where your hearing fails,it can belt serious SPL. Big 18" in a mighty big box,vented...tuned low.That is the recepie for BIG OUTPUT down DEEP.

[dakayus]

What type of surroundings does that thing have? It looks like a regular woofer driver as opposed to a meaty JL or Velodyne. Either way I'd probably just buy a JL driver off of craigslist or ebay and then just make your own custom fathom.

[DrWho]

What type of surroundings does that thing have?

It looks like a regular woofer driver as opposed to a meaty JL or

Velodyne. Either way I'd probably just buy a JL driver off of

craigslist or ebay and then just make your own custom fathom.

A "meaty" JL? The accordian surround is far stronger and more linear

than rolled rubber. The only downside is the difficulty to achieve that

same performance with larger excursions, but that's not an issue when you

have 2.5x the radiating surface area (in other words, 2.5x less excursion).

And due to the lower excursion requirements, the frequency

intermodulation distortion will be dramatically reduced. You'll get

the same grunt output, but without the chuffing. The higher sensitivity

also means less power compression and less thermal nonlinearities.

The rolled rubber surround has certainly come a long way in making

possible large excursion drivers, but large excursion is nowhere near

the ideal approach to low distortion bass reproduction. The accordian

surround is simply a better solution to low excursion drivers, which is

where the low distortion output is going to come from (at the expense

of increased radiating surface area for the same bandwidth and output).

And for what it's worth, the accordian surround has also come a long

way in increasing its excursion capabilities to.

All that to say, the type of surround is certainly nowhere near

sufficient to determine the quality of the subwoofer. In this case, it's probably an argument that the Klipsch is better []

[dakayus]

Oh! I never knew that one. I just figured the woofer seemed more of a high bass (in frequency) reproductor and really didn't think that it would produce much lower spl. Is the surrounds made of paper that's beveled a few times on the edges?

[DrWho]

It might be paper, but it could also be some rubber or foam hybrid or something. The rolls in the accordian seem too large to be a classical paper implementation. In other words, I don't know []