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KSN 1038 [message #48931 is a reply to message #48924]

Mon, 20 February 2006 14:57

dB
Messages: 234
Registered: May 2009

Master

I checked the "real" Motorola/CTS KSN1038 for 96-97dB SPL (>3K5) on Wayne P. webpage, on this forum. Also "Piezo Loudspeaker" Mod.s on this webpage (http://melhuish.org/audio/DIYBX16.html). Don't "fry" them...
Best Regards

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Re: KSN 1038 [message #48932 is a reply to message #48931]

Mon, 20 February 2006 17:35

Bill Thornton
Messages: 23
Registered: May 2009

Chancellor

Yes I had visited this site before and I had already determined to sling 6 or so ohms across the piezo and cross them conventionally at either 3K or 4k actually adding about 0.68Mh to the 5" to stop things getting to bright in the upper mids and then padding down the tweeter
till it all smoothed out (if at all!)But now it looks like these clones
may not be anything like the originals and I could be on a wild goose chase. Still as I say, apart from being a bit " shouty " in the upper mids they dont sound that bad! but then again I am the wrong side of 55
and they old tin ear is beginning to take its toll.Incidently ,I emailed
this CPC outfit and asked them for a response graph & surprise ,surprise the girl there says she will fax me one. If it looks anything like a
KSN1038 Ill report back!

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Re: KSN 1038 - "To" Buy Obsolete Products [message #48934 is a reply to message #48932]

Mon, 20 February 2006 18:27

dB
Messages: 234
Registered: May 2009

Master

Hi,
I can show you a list of 6+ websites (a ring, because they are all connected) distributors in Europe and World with parts made in China (and others) as an example. The graphics they show are "can't read" frequency response graphics that were originaly furnished by Motorola (or just copied). You are losing time. I give you an example to buy 15.000 of that such items from.

Buy Obsolete Products here
(http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=010984007869597059286926661)
another (one) example of this service in Europe
(http://www.vdmais.kiev.ua/about_E.asp)

I prefer to stay with an old style cone tweeter from West Germany, that you can find the curves for (some don't).
RTO cone tweeter here (http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&vat=0&dok=9752.htm)
Best Regards

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Re: piezos [message #48943 is a reply to message #48915]

Wed, 22 February 2006 02:34

Kim Schultz
Messages: 85
Registered: May 2009

Viscount

Check out these measurements I made of some different piezo a while back.

The MPT-100 is a KSN-1038 clone, and as you can see, it isn´t as smooth.

BTW, the KSN-1177 is still my overall favorite, I think it sound more natural than the KSN-1038.

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Re: piezos 1177 [message #48944 is a reply to message #48943]

Wed, 22 February 2006 05:17

dB
Messages: 234
Registered: May 2009

Master

Hi,
Maybe the parts, materials and engineering are better. (or just copies are not so bad if a clone)
Regards.

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Re: piezos 1177 [message #48954 is a reply to message #48944]

Thu, 23 February 2006 00:39

Kim Schultz
Messages: 85
Registered: May 2009

Viscount

No, the KSN-1177 is not a copy, it´s a genuine CTS part.
The copy of that would be MPT-177, and I haven´t tried that one.

There is some obvious differences between the KSN-1038 and the copy MPT-100 frame (see picture)

The copy doesn´t have the same quality to the material, and the horn is a bit longer.

Regards
Kim

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Re: KSN 1038 - "To" Buy Obsolete Products [message #48964 is a reply to message #48934]

Fri, 24 February 2006 07:28

Bill Thornton
Messages: 23
Registered: May 2009

Chancellor

Yes ive just about given up and Ive told them (comet ) that there getting these things back.But Ive decided to stick with piezos and have changed to the 1165 since Ive discovered that its a wide dispersion job
45deg in both planes. In this situation where the speakers have to be hung on rods high up in the corners of the room there may be a distinct advantage to using them. after all frequency response off axis is a
joke in most tweeters ,even expensive ones.Incidentely I can get these kn1165 sourced from Monacor I believe for 3.00 Pounds each locally.
wish me luck.

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Re: KSN 1038 - "To" Buy Obsolete Products [message #48972 is a reply to message #48964]

Sat, 25 February 2006 16:44

Bill Thornton
Messages: 23
Registered: May 2009

Chancellor

Ive just had a further email from CPC (Farnell group - quality component supplier If I remember rightly)to say ,I must paraphrase here as Corporate lawyers forbid me to post what they actually sent!!, that
Motorola no longer manufacture Piezos but that CTS do and use the factories and plant -ex motorola. Their catalogue will be amended in the next addition (august 2006) to reflect this change but the product will
be manufactured to the same specification as the original KSN1038.

I must have done some good then !!! Hah Ha seen any pigs aloft lately?

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