Tweeter power handling ?

[youyoung21147]

Hi everyone,

I've just received some Peerless Exclusive 810921 tweeters, but there is no power rating for these units, in the datasheets or on the drivers...

I was wondering if these units were rugged enough to handle the high powers allowed by their generous Xmax (which allows 110dB @ 1500Hz !!)

That would involve 25W RMS input, roughly 75W RMS.

Has anyone an idea about how much these pretty tweeters can handle ?

Are they ferrofluided like the Seas 27TBFC/G which are supposed to handle 90W RMS continuous ?

[sreten]

Hi,

The impedance profile indicates ferrofluid.

Your power handling estimates, i.e. similar to the Seas is very likely correct.

Your numbers are not, no tweeter can handle 90wrms directly.

Can't find the IEC-268-5 spec, presumably Pink noise
and note this is via a 3khz 2 pole Butterworth filter.

If its standards pink noise (fixed wattage per octave)
there is a lot more power below 3kHz than above.
Also think the pinknoise rolls of 12db octave at 40Hz and 5khz.

But a single tweeter c/o at 3Khz should be good for 100W program.

More (~ 400 W program) if its attenuated back to a more typical 87dB.

:/sreten.

[Tenson]

Sorry to hijack but where can I get the impedance plot for the HDS tweeter? I can see the one in the Peerless PDF but it has no markings!

Cheers!

[youyoung21147]

Sreten : thanks for your answer ! I have always been wondering how such a small voice coil could dissipate 100W, and what you say about pink noise being used for tests confirms my thoughts.

I will be very careful when doing measurements with sine waves.

However do you think I can use this units crossed at 1500Hz ? Their Xmax allow it, but I'm not sure about the voice coil handling as much power as the midrange driver...
I will be running these in a home party soon, I'd be very sad to blow such expensive tweeters


Tenson : don't be sorry, and yes the impedance graph is really of no use... I will measure the impedance of these drivers as soon as this week end, and report it on the forum.

I'm burning in the tweeters right now : connected unfiltered to the amplifier with the volume adjusted such as the highest voltages at the lowest frequencies brings them to Xmax. 1.6V RMS is not likely to blow the coils, well I hope so !
BTW it is very impressive how an unfiltered tweeter can produce good music, far better than laptop computer speakers !

[sreten]

Hi,

Very impressive distortion levels below 1.5kHz.

I'd say its very likely it can do what the Seas 27TBFCG can do here :

http://www.zaphaudio.com/BAMTM.html

see

http://www.zaphaudio.com/tweetermishmash/

for measurements

/sreten.

[youyoung21147]

sreten : oh yes, I have spent many hours on these pages to choose my tweeters. I've picked up the 810921 (and also some 27TBFCG) because of their low distorsion and their 0.5mm Xmax which allows crossing low.

I need to figure if the 810921 is worth the extra cost compared to the 27TBFCG, because they measure very close. The Peerless has the advantage concerning Xmax, but I'm not sure if it can be driven to Xmax at 1500Hz without overheating...

[youyoung21147]

Tenson : that may interest you : I have measured the impedance of my Peerless 810921 tweeters.

Note that the drivers had not been burnt in before I did the measurements (they had just played for 5 minutes or so)

Peerless 810921 measurements page

[Dave Bullet]

youngyoung, Thanks for posting the impedance plot.

I have a pair of the older HDS tweeters. Nothing to rave about performance wise, but they are built solidly (4mm thick aluminium face plate). Good to see Peerless using rigid faceplates on the new HDS tweeter. It may not make one iota of difference sonically, but sure looks and feels nice.

Thanks,
DAvid.

[youyoung21147]

You are welcome

I'm running in the 810921s intensively, and will update the page in a few days with new plots.

Nothing to rave about performance wise

What do you mean here ?

t may not make one iota of difference sonically, but sure looks and feels nice.

Yes, it's quite enjoyable to feel a heavy, cold, well-made object in your hands And it would be interesting to prove it makes no acoustic difference lol.
On this point the Seas 27TBFCG looks a little "cheap" with its plastic front plate. (though it looks very well built too)

[Tenson]

Thanks YouYoung. I will wait for the burned in results before doing nay modelling, but it is nice to see each sample has quite similar measurements right from the start.