Pioneer HPM Driver Question

SoCal Sam

SoCal Sam

Lunatic Member
This is a Pioneer specific question so I thought I would post here instead of over at Speakers. I've got a few HPM questions.

I just scored a another pair of HPM-100's, 100 watt version. I was checking the drivers and found a blown tweeter. I decided to sacrifice my HPM-40's for the great good and pulled the tweeter. It is identical in every way to the 100 tweeter and the model number is near enough the same. Are the two tweeters the same?

I pulled the 100's super tweeter and couldn't get a reading or a continuity beep. I've been running the 100's without the super tweeter and it sounds fine to me. How much contribution does the s. tweet make?

And lastly, how much commonality is there in the drivers of the HPM-100, 60, and 40?
 
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There is something about the way the super tweeters are that you won't get a good continuity test out of them. I was told to turn everything to treble and use a paper tube to try to isolate them and to try to hear something that way. I think I remember they don't even cut in until like 15000hz so you might not even be able to hear them. I know I can't.
 
Hmmm. I doubt my middle aged ears can hear 15 kHz anyways. I had no trouble hearing the tweeter so all is not lost.
 
I tested mine using an 'Oscilator Sweep' on a sound effects CD I own. Forgot what the sweep was 15Hz to 15KHz (maybe lower?) or some such. It starts out with the woofers moving but you can't hear any sound for a quick second then the bass frequency starts to become audible and then it continues up into the stratosphere of high frequency until you can no longer hear it.
The super tweeters do not come online until the frequency is quite high. I doubt they come online during most normal music listening anyway.
 
Are the ribbon tweeters suppose to test good with no ohm reading and no continuity (open)?

If you can't hear them and only your kids and pets can detect the output, what good are they?
 
Living dangerously...

yes, I did this... super tweets pulled from cabinet and clipped on speaker wire directly from the amp (ZERO! volume setting!!) and applied just a little juice to confirm output. I doubt I could have heard any output using the in cabinet method. Too many years of diesels and gas turbines in the Navy have me down to around 16KHz if I'm lucky!
 
I have recently procured a pair of one owner HPM-200's. The Supertweeters still operated. I'm in my mi-70's but my ears are still pretty good. Since the crossover point of the HPM-200 for the Supertweeter is 5000 kHz and above, using a paper tube (like from a roll of paper towels etc.) I could hear the Supertweeter was working listening to the cymbals, various high pitches from a band/orchestra.

The tweeters (as opposed to the "Supertweeter") on the other hand were not operative. Neither super or regular tweeter would give a continuity reading like the conventional speakers would. I assume because of their mylar film design. However, I could check them another way with a capacitor tester. The tester puts out a signal which sounds like either a very high pitched squeal or click when hooked up to a working speaker depending on the capacitor range you are testing. On the working Supertweeter...a definite series of clicks. On the tweeters, nothing. They had to be repaired.
 
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