New Peerless Tweeter

[scottvalentin]

Wow that is very impressive indeed! Thanks for sharing those results!

[humphreyblowdart]

You know what they say about a tweeter with a big faceplate? It should also have a big magnet.
…
Motus
…
Big magnet (and maybe big diaphragm/dome as well) just equals big faceplate.

I can't find a link (maybe it was somewhere on the MAC forum), but I remember seeing someone open up the Motus to find an inset neo motor and a bunch of stuffing—the big faceplate is cosmetic.

[Wolf]

I somehow remembered the slug was bigger than that, oh well, and it was dcibel that had it, and yes on MAC.

Later,
Wolf

[humphreyblowdart]

I somehow remembered the slug was bigger than that, oh well, and it was dcibel that had it, and yes on MAC.

Later,
Wolf

Other features include a damped (fiberglass instead of foam) vented and extended/undercut pole exhausting into a damped rear chamber (also fiberglass damped), a copper shorting ring in the gap area and a second alumi- num shorting ring mounted into the neodymium N48SH ring magnet. There are also eight vent holes beneath the tweeter surround to minimize back pressure applied to the surround.

Found the album. It's a ring magnet, but even so, Wavecor uses an outside neo magnet in the TW022WA04 and its faceplate is less than half the diameter of the Motus. The premium 30 mm ferrite Wavecor models have oversized (115 mm) faceplates and magnets, as well.

[dcibel]

Found the album. It's a ring magnet, but even so, Wavecor uses an outside neo magnet in the TW022WA04 and its faceplate is less than half the diameter of the Motus. The premium 30 mm ferrite Wavecor models have oversized (115 mm) faceplates and magnets, as well.

Yes, the Motus tweeter is a lightweight neo motor, with a heavily damped chamber. The motor is well designed, and the chamber and faceplate are easily removed, so sometime in the future I may play around with this Motus tweeter in waveguide and dipole configuration. I don't imagine the rear wave with the chamber and damping removed will be anything like the front wave, but I think it may do better than most domes in this operation.

The faceplate is large only because of the big damped chamber, not because of the motor size. It's a neo tweeter.

[civit]

It's amazing to watch the progress of the $50 tweeter.

[Squidspeak]

Hey Doctor X, while reading thru the Peerless spec sheet they mentioned about the optional screen/cover for the dome. It is held in place with magnets? Have you or anyone else on the forum taken A/B measurements with the shield removed. With my limited knowledge I thought magnets next to the transducer may affect performance. Also glad you share your research on the forum, as I said months ago people will take you more seriously without the soft porn pictures.

[fdieck]

A speaker already has the magnet. The screen just has to be steel.

[fdieck]

Well- the old TLabs that some say these are knockoffs of weren't exactly small faces either. You know what they say about a tweeter with a big faceplate? It should also have a big magnet.
Examples:
MDT33
TLabs N26
Motus
TB 25-1743
Fostex 33mm
Audax 34mm
Seas Exotic

...and now the Peerless, and likely others I didn't mention.

Big magnet (and maybe big diaphragm/dome as well) just equals big faceplate. I guess the DA32 is over 5" deep. Yowza! That tweeter gotz junk in its trunk.

Later,
Wolf

Did someone say small faces....

https://m.youtube.com/watch?v=14ViwvgtvbA

[donradick]

Did someone say small faces....

https://m.youtube.com/watch?v=14ViwvgtvbA

Priceless! Thanks!

[Squidspeak]

A speaker already has the magnet. The screen just has to be steel.

Not to be confrontational but with my limited knowledge I do realize there is a magnet on the transducer, If I am correct it is mounted on the rear of the driver. What I
was asking if there was a measurable difference with or without the screen in place. It would seem that if the magnet was strong enough to hold a metal screen in
place there might be a difference all things considered.

[Pete Schumacher]

Not to be confrontational but with my limited knowledge I do realize there is a magnet on the transducer, If I am correct it is mounted on the rear of the driver. What I
was asking if there was a measurable difference with or without the screen in place. It would seem that if the magnet was strong enough to hold a metal screen in
place there might be a difference all things considered.

The screen has no magnet. Keep in mind that the magnet may be on the back, but the motor system, the gap formed by the pole and yoke, are right next to the faceplate, and that anything ferrous, screwdrivers, staples, screws, will be accelerated toward the gap where the magnetic field is concentrated.

If there's any difference to be discerned it will be from the occluding effects of the screen and not the small change it would make to the motor system.

[fdieck]

I couldn’t have said it better.

[xmax]

Few pics for those interested, the faceplate aperture is 35mm and the grill diameter is 40mm. The cast faceplate is very thin at 1.5mm but seems rigid enough. Could be a nice feature for anyone that hates dealing with flush mounting. Some moderate spl distortion tests showed very low distortion to 1khz.

Trying to find a fault, I wonder if thermal compression might be a limiting factor when crossing this tweeter over really low. It doesn't have fluid cooling or the coil surface area of tweeters like the old RS28, Morels, etc. But maybe that thick copper cap will wick enough heat into that heatsink? Just a thought.

The tweets I have seem to have the V.C. and dome "carrier" is glued to the face plate, are yours?

[ecj]

There was a bit of excess surround glue that stuck to one side of the faceplate but the faceplate didn't appear to be intentionally glued down, at least on the tweeter I opened. I'd imagine the surround could lift off the carrier if the faceplate was stuck to it all the way around.