If it's got Motorola embossed on it, it's the 'real deal'. I still have a box full of this and several other models bought on a giveaway closeout from Tandy/Radio Shack back in the late '70s? when they converted the local store to a strictly computer oriented one, so whenever the TRS ['trash'] 80 computer came out.
GM
GM
Yes, I was thinking that a clone couldn't have Motorola on the tweeter. I don't want to take this thread into a direction other than what the OP wanted, but I'm wondering what is the main reason that even a good quality piezo such as the Motorola might not be considered to be hi-fi. You do have a large quantity of Motorola Piezos IN a box, not mounted ON a box.
If I'm upsetting the OP, I'll shut up or start a separate thread.
Regards,
Pete
I wish i had the original Motorola cone tweeters.
Then i could tell you.
I am surpised that Motorola did not make more of it in terms of income.
In it´s various disguises it must be one of the most tweeters ever made.
I see them EVERYWHERE.
Then i could tell you.
I am surpised that Motorola did not make more of it in terms of income.
In it´s various disguises it must be one of the most tweeters ever made.
I see them EVERYWHERE.
For those folks who truly have good HF hearing [very few IME and all were women and of course children before the head/ear phone era], they are too 'sharp', though I've had good success using an airbrush to 'mist' on a coat of Dammar to take the edge off, so to speak.
For the rest of us, they are great for adding top end 'air' around the string, horn, etc., instruments when it's on a recording [rare IME]. Even then, most folks into HIFI I've known couldn't really tolerate them below ~5-7.5 kHz where sibilance begins.
Yes, I've used some over the decades, but as it worked out I bought all the store's stock because I could at a dirt cheap price, though after my active DIY 'career', though I didn't realize it at the time or wouldn’t have bothered; and every time I've tried to 'jump start' one in my retirement, 'life' has forced me to follow yet another path.
GM
yup.
Cts/motorola 1016/1038a is awesome when actively crossed 24db@5khz.
Cross any lower and it is spitty/splashy like the cheap dj speakers with piezos.
Norman
Cts/motorola 1016/1038a is awesome when actively crossed 24db@5khz.
Cross any lower and it is spitty/splashy like the cheap dj speakers with piezos.
Norman
Me too. Altec successfully used it quite a bit in later years to extend the life of their decades old bi-flex and inexpensive duplex systems as well as new designs with the coming of CD's increased HF output.
GM
I seem to recall audioXpress having an article about piezo drivers a few years ago. As I remember it was pretty informative. Unfortunately I no longer have any back issues, but if you have access there might be some good information there
search for piezo on audioasylum.com
djk or freddi has great posts.
ideally they are run through a transformer.................
Re: Transformer coupling for Piezo Tweeter - djk - High Efficiency Speaker Asylum
djk or freddi has great posts.
ideally they are run through a transformer.................
Re: Transformer coupling for Piezo Tweeter - djk - High Efficiency Speaker Asylum
Does anyone think that the sibilance (HISSSS), sometimes also described as harshness, could be objectively measured? Would this possibly show up as a distorted sine wave or a signal produced other than the applied signal?
I have a different idea as to how the harshness might be removed, but if I were to test it, I'd like to be produce objective (not a subjective listening response) data showing that it is in fact a remedy.
-Don't know if I might actually pursue this, as I have much else already planned.
Sibilance or HISSS 🙂D) is caused by an anomaly on the response curve, usually the self resonance(s) of the piezo element, and always shows up in one way or another on the graphs, very likely shows itself as a kind of distortion too. On the two attached pictures (piezo tweeters) the nice 6-10-dB peaks and valleys indicate strong resonances responsible for the headche-inducing highs those drivers (at least the vast majotity of them) produce.
Thanks, the graphs are very helpful, as well as your previous post. In the second graph/ picture, what do "straight" and "melded" refer to?
Regards,
Pete
the old cts piezo could probably be tamed a couple of ways. I measured 1/4 of 1 percent THD at 5KHz for >100dB output for a KSN1016 on a stepup transformer. An 8R + 100uH Zobel network is typical for the 0.13uF piezo. A stepup allows >100dB sensitivity 1M at 2.83vrms input.
here's 10 of Goldwood's KSN1005 copy - they have to be hand paired due to poor QC, but at 2 dollars each, are cheap enough to sort.
fwiw I prefer paper cone piezo to the small titanium bullet type
here's 10 of Goldwood's KSN1005 copy - they have to be hand paired due to poor QC, but at 2 dollars each, are cheap enough to sort.
fwiw I prefer paper cone piezo to the small titanium bullet type
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