Please recomend an enclosure volume....

[Big_Bill]

Hello gang, it’s been a while since my last post. I’ve been trying to work out the crossovers [tweeter attenuation] in my 3.5 DIY build. I think I’ve got them dialed in, but. I used the Peerless 832873 HDS 5-1/4" driver as my midrange and I’m troubled by it’s performance. They seem to play a little harsh around 4000 HZ, and I’m wondering if the [sealed] volume of the enclosure is the proper size.

My question is as follows: What [sealed] enclosure volume are you guys using / propose for the flattest frequency response with Peerless 832873 HDS 5-1/4" driver?

I look forward to hearing from you all!

Bill.

[Moondog55]

Bill I think it is more likely to be a crossover problem than a volume problem.
How much and what kind of stuffing is in the midrange box? I can't remember

Have you tried lowering the XO point to 3k at all?

[Big_Bill]

Originally Posted by Moondog55

Bill I think it is more likely to be a crossover problem than a volume problem.
How much and what kind of stuffing is in the midrange box? I can't remember

Have you tried lowering the XO point to 3k at all?

Scratch 4000HZ I said 4000Hz because of the hearing damage in my left ear is around 4000Hz and when I listen to my CD player as a source, my left ear becomes irritated [not present with my turntable as my source]. The midrange band pass is set at a theoretical 300Hz - 3000Hz. I used a 8 ounces of Pollyfill in each midrange enclosure.

What do you think now?

[DcibeL]

Cabinet size and port tuning should be the least of your worries when designing a speaker. You mention problems around 4kHz, this has little to do with your cabinet I suspect. Cabinet design dictates bass, and little beyond that. For a midrange, any smallish sealed cabinet should do, provided it's not a perfect cube, and has a decent amount of stuffing.

Have a look at Zaph's measurements for the 830882.

It's not your driver exactly, but quite similar. As you can see, there is 2nd harmonic distortion at 4kHz due to cone breakup. Being that it's 2nd order, it shouldn't sound too bad, but I would suspect it's noticeable. I would crossover a driver like this around 2.5kHz, 3kHz at most.

Can you share anything of your crossover design? Transfer function, etc?

[Edit: You replies as I was typing. Your cabinet is likely fine, if you're having troubles I would suspect crossover issues. Can you share further details on your speaker design?]

[Big_Bill]

Originally Posted by DcibeL

Cabinet size and port tuning should be the least of your worries when designing a speaker. You mention problems around 4kHz, this has little to do with your cabinet I suspect. Cabinet design dictates bass, and little beyond that. For a midrange, any smallish sealed cabinet should do, provided it's not a perfect cube, and has a decent amount of stuffing.

Have a look at Zaph's measurements for the 830882.

It's not your driver exactly, but quite similar. As you can see, there is 2nd harmonic distortion at 4kHz due to cone breakup. Being that it's 2nd order, it shouldn't sound too bad, but I would suspect it's noticeable. I would crossover a driver like this around 2.5kHz, 3kHz at most.

Can you share anything of your crossover design? Transfer function, etc?

[Edit: You replies as I was typing. Your cabinet is likely fine, if you're having troubles I would suspect crossover issues. Can you share further details on your speaker design?]

The crossover is a 3 way second order DIY job. I used Jeff Bagby’s softare for the values. I did add Zobel correction networks [mounted to the crossover board]. The woofer is low passed @ 300Hz, the midrange is band passed @ 300HZ – 3000Hz and the tweeter is high passed @ 3000Hz. The .5 bass boost is not operable yet.

Bill.

Here is a pic.

[Francec]

I've used the 832873 in an active speaker crossed at 300 and 3000 using an LR4 active low level crossover and they sound excellent. No harshness at all.

Frank

[Big_Bill]

Thanks for your reply!!! Please bear with me here, when you say "LR4", does that mean you used an "inductance & resistance fourth order crossover"?

Bill.

[Dave R]

LR4 means "Linkwitz-Riley 4th order".

Linkwitz-Riley filter - Wikipedia, the free encyclopedia

This page has an example of a LR4 circuit (with a Zobel, Rz1 and Cz1 included on the Vifa Dual)

Speaker Workshop Project Crossover Design

[Francec]

Thia is what I used:

Linkwitz-Riley Electronic Crossover

Frank

[Big_Bill]

Originally Posted by Francec

This is what I used:

Linkwitz-Riley Electronic Crossover

Frank

OK, I understand wich crossover you used. I'd like to know if you went sealed or ported with the Peerless and what volume enclosure you used?