Question for Planet-10 or another Guru

Madmike2 · 11th July 2005, 02:43 AM

I have been playing around with these crossovers and listening extensively. A B to the left and right just to hear tonal differences between the electolytics and the poly caps. Then just for fun i played with the EQ

There is a definite hump now somewhere between 600 and 1000 hz

. Thats no where near my x-over frequency and i could not hear it initially because i wasnt paying attention for that particular anomaly. ( I thought i had cleared it changing frequencies the first time.) now that i know its there i cant stop hearing it.

Before you ask the only way i know it is somewhere in that vacinity is because if i move the 1k slider down a few db it lessens but still has a nasal quality. If i move the 600 hz slider down a few db it is gone. I havent disassembled the x-over and changed polarity to the tweeter ( a real pain ) WOuld that do anything at all ??

Josephjcole · 11th July 2005, 03:31 AM

If you could post more details of your crossover, such as crossover frequency, slope, impedence comensation used, ect... That would help people answer your question better. Most likely though switching the polarity of your tweeter will not help you if your crossover is not that close to to 600Hz or 1kHz. Lots of different things it could be, but with more info it could be narrowed down a bit more.
Joe

Madmike2 · 11th July 2005, 03:47 AM

1800 hz with a 24 db slope. A 6 ohm tweeter with an L-pad for 9 db Hi-Vi 8II and a Morel MW166 in a sealed cabinet. All component values within .5 of whatever was required by the design program.

It sounded great compared to before and back then it sounded great compared to before that and so on. Today i switched out electrolytics and was comparing. When i was playing with the EQ for fun is when i noticed it. Once i heard it i knew it was not right

planet10 · 11th July 2005, 07:13 AM

I won't be much help... if i'm a guru, i am one that avoids XOs.

dave

Madmike2 · 11th July 2005, 03:25 PM

Your still the man Dave. First impressions count and you seem like the guy who would give me a dollar if i was down and out.

Cheap bastage

Madmike2 · 11th July 2005, 03:28 PM

Dcibel pointed out that i shouldnt use iron core inductors in my x-over. something that i dont have much of a choice with right now. DO the saturation liabilites also affect their impedance/inductance characteristics? Could my x-overs be fluctuating and thats why i cant get a stable flat midrange ?

ShinOBIWAN · 11th July 2005, 04:16 PM

Is there any chance you have access to a real time analyser and a sine wave generator?

First off you should start by measuring each driver whilst connected to the XO and again fullrange.

Also do you have a multimeter that can read DC in mV?

Josephjcole · 11th July 2005, 04:38 PM

Could it be peaking from the tweeter? I'm not exactly an crossover expert, and have never acctually designed a crossover for a tweeter, but I believe they will have a sharp spike in impedence at there Fs. If this is somewhere around 1kHz-600Hz this could be causing a peak in the tweeter response.
Joe

Madmike2 · 11th July 2005, 05:16 PM

HMmmmmm i never thought of the tweeter being the culprit. It doesnt have that honk if the two drivers are not running together.

Shin i have a Meterman. It does not do dishes is all.

Josephjcole · 11th July 2005, 11:34 PM

Maybe it's not the tweeter, but if it's not I doubt that the problem is in your crossover. Is the Fs of your tweeter around 1kHz?
Joe

11th July 2005, 02:43 AM	#1
Madmike2 diyAudio Member Join Date: Apr 2005 Location: Toronto	Question for Planet-10 or another Guru I have been playing around with these crossovers and listening extensively. A B to the left and right just to hear tonal differences between the electolytics and the poly caps. Then just for fun i played with the EQ There is a definite hump now somewhere between 600 and 1000 hz . Thats no where near my x-over frequency and i could not hear it initially because i wasnt paying attention for that particular anomaly. ( I thought i had cleared it changing frequencies the first time.) now that i know its there i cant stop hearing it. Before you ask the only way i know it is somewhere in that vacinity is because if i move the 1k slider down a few db it lessens but still has a nasal quality. If i move the 600 hz slider down a few db it is gone. I havent disassembled the x-over and changed polarity to the tweeter ( a real pain ) WOuld that do anything at all ?? __________________ Persistence is better then intelligence. Unless persistence kills you.

11th July 2005, 03:47 AM	#3
Madmike2 diyAudio Member Join Date: Apr 2005 Location: Toronto	1800 hz with a 24 db slope. A 6 ohm tweeter with an L-pad for 9 db Hi-Vi 8II and a Morel MW166 in a sealed cabinet. All component values within .5 of whatever was required by the design program. It sounded great compared to before and back then it sounded great compared to before that and so on. Today i switched out electrolytics and was comparing. When i was playing with the EQ for fun is when i noticed it. Once i heard it i knew it was not right __________________ Persistence is better then intelligence. Unless persistence kills you.

11th July 2005, 07:13 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I won't be much help... if i'm a guru, i am one that avoids XOs. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

11th July 2005, 03:25 PM	#5
Madmike2 diyAudio Member Join Date: Apr 2005 Location: Toronto	Your still the man Dave. First impressions count and you seem like the guy who would give me a dollar if i was down and out. Cheap bastage __________________ Persistence is better then intelligence. Unless persistence kills you.

11th July 2005, 03:28 PM	#6
Madmike2 diyAudio Member Join Date: Apr 2005 Location: Toronto	Dcibel pointed out that i shouldnt use iron core inductors in my x-over. something that i dont have much of a choice with right now. DO the saturation liabilites also affect their impedance/inductance characteristics? Could my x-overs be fluctuating and thats why i cant get a stable flat midrange ? __________________ Persistence is better then intelligence. Unless persistence kills you.


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11th July 2005, 03:31 AM	#2
Josephjcole diyAudio Member Join Date: Jun 2004 Location: Wisconsin	If you could post more details of your crossover, such as crossover frequency, slope, impedence comensation used, ect... That would help people answer your question better. Most likely though switching the polarity of your tweeter will not help you if your crossover is not that close to to 600Hz or 1kHz. Lots of different things it could be, but with more info it could be narrowed down a bit more. Joe

11th July 2005, 04:16 PM	#7
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	Is there any chance you have access to a real time analyser and a sine wave generator? First off you should start by measuring each driver whilst connected to the XO and again fullrange. Also do you have a multimeter that can read DC in mV?

11th July 2005, 04:38 PM	#8
Josephjcole diyAudio Member Join Date: Jun 2004 Location: Wisconsin	Could it be peaking from the tweeter? I'm not exactly an crossover expert, and have never acctually designed a crossover for a tweeter, but I believe they will have a sharp spike in impedence at there Fs. If this is somewhere around 1kHz-600Hz this could be causing a peak in the tweeter response. Joe

11th July 2005, 05:16 PM	#9
Madmike2 diyAudio Member Join Date: Apr 2005 Location: Toronto	HMmmmmm i never thought of the tweeter being the culprit. It doesnt have that honk if the two drivers are not running together. Shin i have a Meterman. It does not do dishes is all. __________________ Persistence is better then intelligence. Unless persistence kills you.

11th July 2005, 11:34 PM	#10
Josephjcole diyAudio Member Join Date: Jun 2004 Location: Wisconsin	Maybe it's not the tweeter, but if it's not I doubt that the problem is in your crossover. Is the Fs of your tweeter around 1kHz? Joe

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