Peerless 830986 full range

[capslock]

There is already a thread on these drivers but that has developed into preamp and amp design.

I want to focus on the drivers, starting with build quality and maybe later continue with measurements.

First of all, a side view: vented spider, vented voice coil former.

[capslock]

Rear view: really open construction. Interestingly, they did not use the segmented cone edge seen on many Vifa drivers including the TG9.

[capslock]

Aluminum dust cap sits right on the voice coil. I even suspect they might be made from one piece:

[TacoD]

Alu dustcap -> better HF response?

[Reet]

This looks like a very good driver, but I don't think I would want to use it "full range". It's frequency response shows a fairly significant peak around 10kHz that will likely melt your ears. I doubt this driver would be very useful above 7kHz.

It would likely work well crossed to a small tweeter at around 4kHz. When crossing this high, good results can be achieved with cheap drivers. The Aura NT1 looks like a very good candidate.

Interestingly enough, I wan unable to find this product on Tymphany's website, however there is a datasheet at Madisound that states "OEM preliminary" so this driver may be some sort of oddity exclusive to Madisound, like a nice Vifa subwoofer I remember them carrying a while back. Tymphany's website did look a bit different today, with some indication of products to come: Peerless Aluminum HDS woofer, new Scan-Speak no-corners-cut driver. But that's a discussion for a different thread.

[Gir]

That 10kHz peak should be easy enough to take it with a notch filter. They probably wouldn't do too bad as a fullrange once that is fixed. You'll just have that little oddity above 15kHz where it has a big dip on axis, then rises at 30 degrees off axis, then goes back down at 60 8O

[Reet]

the 10kHz peak looks like the cone breakup of the aluminum cone, and even if the peak is brought back to a flat response with a filter, the distortion at this point would still be very high. I guess the 2nd harmonic may be out of audible range, but your dog would surely suffer

It probably could be done, but I personally would spend the extra on the tweeter and crossover parts if I were to use this driver. The Aura NS3 for a few more dollars I think would be a better selection for full range use.

[Jed]

Hey Capslock,

I've got a pair of these and took some quick HD tests and they look to be very good- which I've posted in the amp/computer speaker thread where I am planning a small two way with these and the Aura NT1. http://www.htguide.com/forum/showpos...2&postcount=28

I want to properly mount them and see if I can get the distortion a bit lower. I measured them in a flimsy box and THD was respectable from 400-500hz on up. Who knows, might be competition for the Accuton C44s :W .

Jed

[Dennis H]

You know, there have been several requests here for a 'diffuse' surround speaker for HT. I had a pair of the original Bose (gasp) 901s for a while back in the day and I've often thought they'd make a great surround speaker if I had kept them. With these little babies going for $12 in quantity, it wouldn't cost all that much to build a mini 901 with 8 drivers firing backward and 1 firing forward. Or, maybe 4 backward and 1 forward. Hang them from the ceiling a little way from the wall and bounce sound all over the room.

[augerpro]

You know, there have been several requests here for a 'diffuse' surround speaker for HT. I had a pair of the original Bose (gasp) 901s for a while back in the day and I've often thought they'd make a great surround speaker if I had kept them. With these little babies going for $12 in quantity, it wouldn't cost all that much to build a mini 901 with 8 drivers firing backward and 1 firing forward. Or, maybe 4 backward and 1 forward. Hang them from the ceiling a little way from the wall and bounce sound all over the room.

HERETIC!!!! LOL