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Kpt-100


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#1 yamafied

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Posted 17 September 2012 - 06:05 PM

Does anyone know the crossover frequency for the Kpt-100? I want to try some prefab crossovers to get rid of the "x-curve". If anyone knows how to mod the factory crossover to eliminate the "x-curve" roll-off, that would be welcome info as well.

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Posted 17 September 2012 - 06:45 PM

700hz. the clue is the coverage angle information....it' specific to the horn.

SPECIFICATIONS
COVERAGE ANGLE: Horizontal 100(o) (+-)10(o) 700Hz-15kHz (br)Vertical 100(o) (+-)30(o) 700Hz-15kHz
DIMENSIONS: 21.25" (53.9cm) x 11.5" (29.2cm) x 12.5" (31.8cm)
DIRECTIVITY INDEX: 7dB (+-)2dB 700Hz-15kHz
FREQUENCY RESPONSE: 65Hz - 14kHz(+-)4dB
MAX CONTINUOUS OUTPUT: 113dB
NOMINAL IMPEDANCE: 8 ohms, 4.1 ohms minimum at 200Hz
POWER HANDLING: 100 watts (20V) 40Hz - 10kHz
SENSITIVITY: 96dB @ 1 watt/1 meter
WEIGHT: 26 lbs. (11.8kg)

#3 yamafied

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Posted 18 September 2012 - 03:17 AM

Thanks for the information. Among commonly available "prefab" crossovers, 800hz two ways seem to be common. Would this be a good choice, or am I missing something?

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Posted 18 September 2012 - 10:34 AM

post a new thread with a title of X-curve mod for kpt-100. someone has done it. there was a flood of kpt100's and 200's here on the forum last year.



#5 bhendrix

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Posted 20 September 2012 - 06:56 PM

According to the spec sheet on the attached link from 1998, the KPT-100 with a K-761 tweeter crosses at 3000Hz.

The frequency response on the spec sheet would suggest there may not be an x-curve roll-off in earlier models from 1998.

I believe there was a KPT-100A and a KPT-100B.

http://web.archive.o...ww.klipsch.com/



#6 yamafied

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Posted 21 September 2012 - 07:46 AM

Thanks for the response, however, I might be even more confused now. If the 3000Hz is correct, I will have more (cheaper) options in terms of passive networks. That does seem a bit high to me though. I am pretty sure that mine do have the x-curve. I have to push the levels 3-5db's up in comparison to my other Klipsch speakers (that are of the same era and have the same sensitivity) to get them to blend well. Even then, the highs and lows just don't seem like they are there.

Oddly, I also got an email from Klipsch support this morning stating that it was 65Hz, which definitely can't be right. I assume the rep thought I was asking where to cross my sub over, but even then, the low end for the KPT-100 is 75Hz.

Surely with the number of these things that seemed to have been dumped on to the market in the last year or so, someone has tackled this project. I will have to take Speakerfritz's advice and create a new post. I tried to put this in the correct place (Pro), but maybe somebody in the consumer area has done this.

#7 mikebse2a3

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Posted 21 September 2012 - 02:03 PM

There are different crossovers depending on what version of KPT-100 you have.

Have you got numbers on the crossover and/or can you take pictures of the crossovers?

miketn



#8 yamafied

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Posted 21 September 2012 - 03:35 PM

There are different crossovers depending on what version of KPT-100 you have.

Have you got numbers on the crossover and/or can you take pictures of the crossovers?

miketn


The xover says "KPT-100D". I am trying to get a pic posted. If I can't, please use the following link:

http://imgur.com/FHmZN
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#9 yamafied

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Posted 21 September 2012 - 03:54 PM

I was just sent schematics from Klipsch for the 100A and 100B networks. My xover has the same LF caps as the 100B, but that's about all that I can recognize.

#10 yamafied

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Posted 21 September 2012 - 06:30 PM

Ok, so after having brushed up on my schematic reading skills, I would say that this "KPT-100D" that I have must be the same as the 100B. The part that confuses me is the number of resistors. Everything else seems to match up. I am now analyzing this to determine what I could pull out to defeat the x-curve. My thoughts at the moment are that getting rid of the 15uF cap and the .4 mH inductor might do this. I would be grateful for any input that any of you might have. This is not my field of expertise by any means.
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#11 mikebse2a3

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Posted 22 September 2012 - 09:08 AM

Here is the KPT-100-D schematic.

I've not tested this myself but I would suggest you try to bypass the .3mh coil and the 7ohm 25watt resistor(or reduce it's value) in the tweeter circuit. This will give you the most high frequency extension. Note: the (RXE 075 and Parallel 200ohm 25 watt resistor) is the poly switch protection circuit for the tweeter and if you want to test it listen at a moderate level and temporarly short across it and listen for any significant spl increase (A significant spl increase would indicate it's value has changed and is out of spec).

The (1.1mh/15uf/7ohm 25w series RLC circuit) in parallel with the woofer is centered on 1239Hz with a banwidth of 1012.8Hz so this results in a reduction in this region. If you take this circuit out listen to vocals especially and see if it is perceived as better or worse.

Without doing some acoustical testing this is my best suggestions for you to try.

miketn

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  • KPT-100-D schematic.JPG


#12 CECAA850

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Posted 22 September 2012 - 09:54 AM

They look the same as mine. If you figure out how to do it, let me know. I have 4 of them I'd mod.

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#13 CECAA850

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Posted 22 September 2012 - 09:55 AM

Back

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#14 yamafied

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Posted 22 September 2012 - 11:55 AM

Here is the KPT-100-D schematic.

I've not tested this myself but I would suggest you try to bypass the .3mh coil and the 7ohm 25watt resistor(or reduce it's value) in the tweeter circuit. This will give you the most high frequency extension. Note: the (RXE 075 and Parallel 200ohm 25 watt resistor) is the poly switch protection circuit for the tweeter and if you want to test it listen at a moderate level and temporarly short across it and listen for any significant spl increase (A significant spl increase would indicate it's value has changed and is out of spec).

The (1.1mh/15uf/7ohm 25w series RLC circuit) in parallel with the woofer is centered on 1239Hz with a banwidth of 1012.8Hz so this results in a reduction in this region. If you take this circuit out listen to vocals especially and see if it is perceived as better or worse.

Without doing some acoustical testing this is my best suggestions for you to try.

miketn


Thanks for this! This is exactly what I was looking for.

#15 BEC

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Posted 11 October 2012 - 05:27 PM

Carl sent me one of his KPT-100s so I could do some testing on it. First here is the FR of the speaker stock.

Bob Crites

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  • kpt-100 factory original.jpg


#16 BEC

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Posted 11 October 2012 - 05:38 PM

The added jumper I show here will extend the highs.

Bob Crites

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  • kpt100mod.jpg


#17 BEC

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Posted 11 October 2012 - 05:40 PM

Here is a trace of the FR with the mod in place.

Bob Crites

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  • kpt-100 mod poly.jpg


#18 BEC

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Posted 11 October 2012 - 05:43 PM

Implementation is pretty easy. Just a short jumper wire soldered in place will do it. Here is a picture of the added wire. Just clip the wire and the crossover is back to stock.

Bob Crites

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  • kpt100mod.jpg


#19 BEC

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Posted 11 October 2012 - 05:45 PM

One more thing, the diaphragm used in the HF is a soft poly dome type. It can be replaced with a titanium for some even better highs. I tried that and if mine, the titanium woud definately be used.

Bob Crites



#20 CECAA850

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Posted 11 October 2012 - 06:41 PM

Can't wait to hear them. Did you run a graph with the different tweeters or just listen to them?