nice work fred.
Good job on the drawing for the motorola 1016.
Biggest trouble with retail is people knew that that was a $10 piezo in the $10,000 speaker.
Transformer/zobel/ notch if needed, it would blow away ANY ribbon at a fraction of the cost.
yea.
I said it.
quote me.
Fred has the distortion plots............
I had a motorola 1038A actively crossed 24db LR at 5khz with a 30ohm in series, absolutely stunning.
Good job on the drawing for the motorola 1016.
Biggest trouble with retail is people knew that that was a $10 piezo in the $10,000 speaker.
Transformer/zobel/ notch if needed, it would blow away ANY ribbon at a fraction of the cost.
yea.
I said it.
quote me.
Fred has the distortion plots............
I had a motorola 1038A actively crossed 24db LR at 5khz with a 30ohm in series, absolutely stunning.
Yeah exactly
Many examples of being crossed too low.
With simple filters.
Like any driver, pound it out of bandwidth
bunch of distortion.
Use a steep filter, and impedance compensation
and cross around 4 , 5 , 6k
feasible to pair with maybe 3" or 4" mid/ wideband
Dirt cheap driver, crossover components would cost more.
And huge trendy 500 watt coils aren't needed.
Be helpful to have impedance measurement
to actually fine tune the crossover.
Dont need transformer, you can create whatever impedance
you want with resistor and cap, or basic passive Zobel
If you try to use conventional crossover without Zobel.
Be almost dead short.
With Zobel and resistor value can make it 6 , 8 , 10 ohms
whatever heck you want. Just important to have
impedance data to fine tune Zobel and crossover
Impedance curve of classic Motorola KSN1041
From about 2k be little different than usual , 600 ohms to around 50 ohms
Drop in 8 ohm Zobel around 10 to 18uf to start curve around 2k
Bing...Straight line 8 ohms
Drop in 3rd order 5k crossover
Of course the FRD comes from old Motorola Datasheet
with gracious amounts of smoothing. But that is basic 5k super tweet
Impedance data is important if you add padding, the Zobel needs
fine tuning. All rather simple.
You just cant use conventional crossovers without Zobel
no transformer needed.
Many examples of being crossed too low.
With simple filters.
Like any driver, pound it out of bandwidth
bunch of distortion.
Use a steep filter, and impedance compensation
and cross around 4 , 5 , 6k
feasible to pair with maybe 3" or 4" mid/ wideband
Dirt cheap driver, crossover components would cost more.
And huge trendy 500 watt coils aren't needed.
Be helpful to have impedance measurement
to actually fine tune the crossover.
Dont need transformer, you can create whatever impedance
you want with resistor and cap, or basic passive Zobel
If you try to use conventional crossover without Zobel.
Be almost dead short.
With Zobel and resistor value can make it 6 , 8 , 10 ohms
whatever heck you want. Just important to have
impedance data to fine tune Zobel and crossover
Impedance curve of classic Motorola KSN1041
From about 2k be little different than usual , 600 ohms to around 50 ohms
Drop in 8 ohm Zobel around 10 to 18uf to start curve around 2k
Bing...Straight line 8 ohms
Drop in 3rd order 5k crossover
Of course the FRD comes from old Motorola Datasheet
with gracious amounts of smoothing. But that is basic 5k super tweet
Impedance data is important if you add padding, the Zobel needs
fine tuning. All rather simple.
You just cant use conventional crossovers without Zobel
no transformer needed.
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Piezo, Brian Steele Blastoramas
https://www.diysubwoofers.org/projects/home/blastoramas/
https://techtalk.parts-express.com/...inence-beta-8a-with-the-grs-pz1016-2-x5-piezo
Updated with cheap Pyle neodymium compression driver, Brian Steele Blastoramas V2
https://www.diysubwoofers.org/projects/home/BlastV2/
Darren Kuzma The Golden Boys - Parts Express
https://projectgallery.parts-express.com/speaker-projects/the-golden-boys/
https://www.diysubwoofers.org/projects/home/blastoramas/
https://techtalk.parts-express.com/...inence-beta-8a-with-the-grs-pz1016-2-x5-piezo
Updated with cheap Pyle neodymium compression driver, Brian Steele Blastoramas V2
https://www.diysubwoofers.org/projects/home/BlastV2/
Darren Kuzma The Golden Boys - Parts Express
https://projectgallery.parts-express.com/speaker-projects/the-golden-boys/
Last edited:
Yes, do that , but because the impedance @ 20kHz is now very low, you should add a 3.9 ohm resistor in series
with your positive input connection to protect both amp. & tweeter.
Last edited by a moderator:
Almost always when I see someone mention piezo tweeters, I think of the highly regarded Dahlquist DQ-10 of the 1970s. It was a 5-way(!) floorstander looking a lot like a Quad ESL-57 and using a Motorola(?) horn piezo. Here's a pair, w/excellent photos, someone bought in great condition.
