Interesting crossover question

Fast1one · 15th February 2007, 08:33 PM

I have an old amp laying around collecting dust because it has a high pass crossover at around 250HZ (guessing around 12db/octave). My question is simple but Im not sure if its easy to solve. How would I go about locating and removing/altering this crossover for a lower high pass point? Seems like a long shot but maybe you guys can help...

Thanks
-Sergio

davidallancole · 15th February 2007, 09:20 PM

What is the amp?

Jonathan Bright · 15th February 2007, 09:57 PM

Three things puzzle me a bit about your description. These are "old", "12db" and "cross over". My first thought was that it may be a realtively cheap (old) Oriental design with a 6db slope rumble filter. They have been known to cut in at a high frequency. But as the previous post said we would need more info'. If thats possible then the changes aren't too difficult to do. My second thought was to ask if it's a car amp?

Fast1one · 16th February 2007, 05:31 PM

No its not a car amp...its actually off a computer system that was sold a few years back. Its not THAT old but yeah...used that term a little loosely there

Basically the system consisted of a sub and four speakers...the frequency response said 250hz-20K for the highs, so Im assuming thats where the filter is...Its a long shot and I would be surprised if you guys had an answer....I wanted to use it for a couple of full range speakers for my computer again...naturally the filter kills the purpose..

Thanks
-Sergio

kubeek · 16th February 2007, 06:36 PM

I would open it, and try to follow the singal path till the point it divides into the subwoofer section and the other speakers section.
The filter will probably be at the beginning of the speakers section.

zlast · 16th February 2007, 08:20 PM

the response was probably due to the incredibly SMALL diameter cones on the speakers...unless the specs specify a crossover..usually manufacturers cut as many corners/cost as possible...

lndm · 16th February 2007, 10:15 PM

This amp is probably designed for low power. Are you sure you want to run it full range with perhaps less efficient speakers?

Fast1one · 17th February 2007, 08:04 PM

Its only a 3 watt amp, And Ill probably run more efficient speakers, Or I may make it into a boom box

Its just a toy, Ill try measureing the frequency response to see if it actually has a crossover or not, then Ill go from there. Thanks for the help guys..

-Sergio

15th February 2007, 08:33 PM	#1
Fast1one diyAudio Member Join Date: Sep 2006	Interesting crossover question I have an old amp laying around collecting dust because it has a high pass crossover at around 250HZ (guessing around 12db/octave). My question is simple but Im not sure if its easy to solve. How would I go about locating and removing/altering this crossover for a lower high pass point? Seems like a long shot but maybe you guys can help... Thanks -Sergio

15th February 2007, 09:57 PM	#3
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Three things puzzle me a bit about your description. These are "old", "12db" and "cross over". My first thought was that it may be a realtively cheap (old) Oriental design with a 6db slope rumble filter. They have been known to cut in at a high frequency. But as the previous post said we would need more info'. If thats possible then the changes aren't too difficult to do. My second thought was to ask if it's a car amp? __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

16th February 2007, 08:20 PM	#6
zlast diyAudio Member Join Date: Sep 2004 Location: none	the response was probably due to the incredibly SMALL diameter cones on the speakers...unless the specs specify a crossover..usually manufacturers cut as many corners/cost as possible... __________________ none

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ppi epx 205, interesting crossover (to me, at least)	ppia600	Car Audio	2	25th February 2008 05:50 AM
Here's an interesting TL pipe question ???	Fish Chris	Subwoofers	16	1st February 2007 08:10 PM
interesting sub enclosure question?	aaronp1	Car Audio	11	13th October 2006 05:36 AM
An interesting capacitor question	KBK	Parts	40	11th August 2006 01:41 AM
Interesting question	rs1026	Chip Amps	7	24th November 2004 03:21 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

15th February 2007, 09:20 PM	#2
davidallancole diyAudio Member Join Date: Nov 2005	What is the amp?

16th February 2007, 05:31 PM	#4
Fast1one diyAudio Member Join Date: Sep 2006	No its not a car amp...its actually off a computer system that was sold a few years back. Its not THAT old but yeah...used that term a little loosely there Basically the system consisted of a sub and four speakers...the frequency response said 250hz-20K for the highs, so Im assuming thats where the filter is...Its a long shot and I would be surprised if you guys had an answer....I wanted to use it for a couple of full range speakers for my computer again...naturally the filter kills the purpose.. Thanks -Sergio

16th February 2007, 06:36 PM	#5
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	I would open it, and try to follow the singal path till the point it divides into the subwoofer section and the other speakers section. The filter will probably be at the beginning of the speakers section.

16th February 2007, 10:15 PM	#7
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	This amp is probably designed for low power. Are you sure you want to run it full range with perhaps less efficient speakers?

17th February 2007, 08:04 PM	#8
Fast1one diyAudio Member Join Date: Sep 2006	Its only a 3 watt amp, And Ill probably run more efficient speakers, Or I may make it into a boom box Its just a toy, Ill try measureing the frequency response to see if it actually has a crossover or not, then Ill go from there. Thanks for the help guys.. -Sergio

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read