Recessing Peerless woofer

[gmed]

I have made many attempts to recess the peerless woofer, which is one of my favorite woofers.

I finally got it right, though I would have liked a little closer cut.

I used a 1/8 bit, and went around the speaker and cut a 1/4 plywood, white the speaker was mounter on it. then I used the big template to cut a smaller one, this time the router insider the big circle. then I use the small cut out with a collar to cut the recess. I think the bushing is 5/16. Perhaps I need to use 3/8 bushing for a closer cut.
so is the collar supposed to be three times the thickness of the bit?

[gmed]

Yeap, I used a 5/16" bushing. I need to use 3/8"

[---k---]

Regardless, I'm impressed. Those truncated frames are a pain in the butt.
Your tweeter looks equally impressive. What tweeter are you using?

[gmed]

It's a Vifa. I forget the model number. It's also truncated. Today I used a 3/8 bushing and it was right on.

[5th element]

It sounds like you've done pretty much what this does.



I have one of those and it works very well for tricky shapes. The bit you have to be careful of is making sure to tape up the backside of the driver so that no dust can get stuck where it could cause trouble.

I think Peerless came up with those flange designs specifically so that you could surface mount the drivers.

[JonW]

Nice work! I always look at those drivers and think "How the heck are you supposed to flush mount them?!" Maybe from what 5th element is saying, you don't need to. Regardless, your work is elegant.

[5th element]

Well I think flush mounting any driver is always the way to go, but Peerless have put on obvious effort around the frame edge to narrow the profile slightly and to keep it less of an acoustic influence to any nearby mounted tweeter.

It is almost always the tweeters performance that suffers from having protrusions in and around it, as the wavelengths associated with woofers are just too large to really be affected. The bigger and more immediate the protrusion the larger the effect. Something like the Dayton ND series don't need flush mounting at all, whereas something like the Scan illuminator woofers absolutely require it. These Peerless drivers are much closer to the Dayton NDs when it comes to how necessary it would be. You are going to get improvements from flush mounting, but whether or not it's strictly required (from a performance point of view) is open to interpretation (and to the specific design) . Of course if you vastly the prefer the visual appearance of the flush mounted Peerless driver then that's going to make the choice any day of the week

[JonW]

You are going to get improvements from flush mounting, but whether or not it's strictly required (from a performance point of view) is open to interpretation (and to the specific design) . Of course if you vastly the prefer the visual appearance of the flush mounted Peerless driver then that's going to make the choice any day of the week

And not to mention that performance can influence appearance. I'm so used to thinking that drivers (especially tweeters, as you said) need to be fish mounted for optimal performance. Such that, whenever I see any driver that is not flush mounted, it feels odd to me. Something is off. That driver needs to be flush mounted.

[kevinm]

quick question, what kind bit did you use to cut out your guide? If I understand correctly, you just used the woofer as an outline to cut the guide?

[gmed]

I used an 1/8" spiral but, then the same for te inner guide, then use. 3/8 bushing. As a general rule, keep the bushing 3x the bit.


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[kevinm]

What did you use to protect the edge of the driver as you cut out the hole with the spiral bit?

[gmed]

Nothing is needed as the router base is abs, glides right along the outer edge of the driver


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[gmed]

I do not use the method used with the above kit. See this link. This is what I did.

http://www.exquisiteaudio.com/baffle.html

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[gmed]

Just make sure you use a centering took to center the base first.


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[5th element]

Tweeters always need flush mounting, unless they've been designed specifically not to be.

[kevinm]

I do not use the method used with the above kit. See this link. This is what I did.

http://www.exquisiteaudio.com/baffle.html

Ohhhhhh...that makes sense. Thanks for the link! That's a really cool trick. Amazing how valuable scraps of wood are!

[gmed]

With 3/8" bushing


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