orion 2150sx boost circuit

Clipped · 7th January 2008, 02:34 AM

anyone know which part of the board the boost circuitry is located?

i want to change the boost frequency from 40hz to around 45-47ish hz...on the low boost side .

and possibly change the high boost to a second low boost at an octave higher than the low boost...or somewhere around there.

how would you calcuate the values for the components used to determine the boost frequencies?

thanks

ECM · 7th January 2008, 06:40 AM

I have looked into this myself, but instead of changing the frequency, I wanted to bypass the mid and high.

I started to trace (but never completed) the signal thru the boost button over to a couple of op amps. It seems like orion uses a standard RC network around the opamp to produce the boost curve. Your best bet would be to draw out the entire boost circuit to determine which kind of filter topology is being used then it should be easy to calculate the desired center frequency.

Have you measured the frequency response with the boost enabled? I wouldn't be surprised if the frequency is off by a few Hz here and there due to tolerances in the resistors and capacitors. You may already be at 45Hz.

BTW, 9 hrs to go and still high bidder.

ECM · 7th January 2008, 06:42 AM

Now that I think about it, orion may have just produced a "null" at the mid frequency to give the illusion of boosted highs and lows.

ppia600 · 7th January 2008, 02:20 PM

Quote:

Originally posted by ECM
I have looked into this myself, but instead of changing the frequency, I wanted to bypass the mid and high.

I started to trace (but never completed) the signal thru the boost button over to a couple of op amps. It seems like orion uses a standard RC network around the opamp to produce the boost curve. Your best bet would be to draw out the entire boost circuit to determine which kind of filter topology is being used then it should be easy to calculate the desired center frequency.

Have you measured the frequency response with the boost enabled? I wouldn't be surprised if the frequency is off by a few Hz here and there due to tolerances in the resistors and capacitors. You may already be at 45Hz.

BTW, 9 hrs to go and still high bidder.

Btw, which amp are you bidding on? Is it the orion nt 100? For being brand new it looks like its been sitting out of the box for quite a while, kind of dusty.. I wonder what its going to go for, I"m guessing around $675-700.

ECM · 7th January 2008, 04:43 PM

no, the orion 2150SX with extra heat sink. got it for $150, will be shipping it to Clipped once I get it.

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=003

Clipped · 9th January 2008, 02:21 PM

ECM...is helping to contribute to my bass addiction

you see the collection of old school processors? oh man those are hard to find... wonder how they compare to equipment nowadays, seems like the output voltage would be lower than todays equipment.

im tracing the boost path as i speak...maybe i'll try plugging in different values and see what happens.

7th January 2008, 02:34 AM	#1
Clipped diyAudio Member Join Date: Mar 2005 Location: home	orion 2150sx boost circuit anyone know which part of the board the boost circuitry is located? i want to change the boost frequency from 40hz to around 45-47ish hz...on the low boost side . and possibly change the high boost to a second low boost at an octave higher than the low boost...or somewhere around there. how would you calcuate the values for the components used to determine the boost frequencies? thanks

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7th January 2008, 06:40 AM	#2
ECM diyAudio Member Join Date: Jul 2004 Location: Cyprus	I have looked into this myself, but instead of changing the frequency, I wanted to bypass the mid and high. I started to trace (but never completed) the signal thru the boost button over to a couple of op amps. It seems like orion uses a standard RC network around the opamp to produce the boost curve. Your best bet would be to draw out the entire boost circuit to determine which kind of filter topology is being used then it should be easy to calculate the desired center frequency. Have you measured the frequency response with the boost enabled? I wouldn't be surprised if the frequency is off by a few Hz here and there due to tolerances in the resistors and capacitors. You may already be at 45Hz. BTW, 9 hrs to go and still high bidder.

7th January 2008, 06:42 AM	#3
ECM diyAudio Member Join Date: Jul 2004 Location: Cyprus	Now that I think about it, orion may have just produced a "null" at the mid frequency to give the illusion of boosted highs and lows.

7th January 2008, 04:43 PM	#5
ECM diyAudio Member Join Date: Jul 2004 Location: Cyprus	no, the orion 2150SX with extra heat sink. got it for $150, will be shipping it to Clipped once I get it. http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=003

9th January 2008, 02:21 PM	#6
Clipped diyAudio Member Join Date: Mar 2005 Location: home	ECM...is helping to contribute to my bass addiction you see the collection of old school processors? oh man those are hard to find... wonder how they compare to equipment nowadays, seems like the output voltage would be lower than todays equipment. im tracing the boost path as i speak...maybe i'll try plugging in different values and see what happens.