Hi
Does anyone have or know of a schematic diagram for the amp on these subs. If I remember correctly the amp is a Cyrus built amp.
Thanks
Brent
Does anyone have or know of a schematic diagram for the amp on these subs. If I remember correctly the amp is a Cyrus built amp.
Thanks
Brent
Sorry about the quality (they were taken on my phone)
100~200W iirc
Brent
100~200W iirc
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Brent
Ah, I was hoping that they would be similar to a couple of other bass amps that I do have schematics for, but unfortunately they are very different. Sorry.
Never mind cheers
Ive changed the caps on the various power rails and need to change the op amps for the gain , xover and phase.
It uses fairly boggo TL074CN (quad) , a was thinking of using OPA4134 but thought id ask if there is an ideal subwoofer opamp. I could always use dual opamps and mount on a pcb to make them quad.
Brent
Ive changed the caps on the various power rails and need to change the op amps for the gain , xover and phase.
It uses fairly boggo TL074CN (quad) , a was thinking of using OPA4134 but thought id ask if there is an ideal subwoofer opamp. I could always use dual opamps and mount on a pcb to make them quad.
Brent
Unless you have something strange going on, then the OPA4227 is a pretty good quad to go with. I've used it in active crossovers before, and it works well.
R165 and R166 value
hi,Brent,
May i know the value of 2 resistors R165 and R166?mine are burnt and can't see.Thanks!
CKS
hi,Brent,
May i know the value of 2 resistors R165 and R166?mine are burnt and can't see.Thanks!
CKS
Hello,
My unit had issue with he woofers...long story short: the spiders had de-glued almost completly from the center cilíndrical winding thing and the woofers would under perform, and distort even at médium usage. The previous owner abuse the thing to get the "amount" of Bass it needed. The dust caps were partially detached and "ading" some noise to the mix. I removed the dust things put some peaces of paper to recenter the woofer, re-glued the spider, waited 24h, removed the ppieces of paper, tested them and glued the dust caps back.
This exposed the fact that the amp did get some abuse. (never really used it i get around to fix it....only teste it trought he high level inputs):
Symptom 1- connect by high level (sinal from the speakers) it under perform in the sense you have to pushed it over 75% to get loudish(poor quality basse. ..worse than my kef psw1000.2)not how it should be.
Symptom 2- conected with the line in (s) is where things got really weird. Even without the volume all to the minimum it played really loud and the volume only starts to take efect(even more loud) over 75% of the volume button reach. I even tried directy from the analog out of two different blu-Ray players and its the same.
With only symptom one i would start by replacing the 2 big filter caps ( one seams just maybe a bit bulgy....) and the R165/R165 that are kinda tosted...4.7ohm by striker color that mesured 9 ohms in-circuit(i know). But with symptom 2 things mighty more complicated.
The output has really low vdc with no inputs, the same with high level inputs. With line in inputs i didn't measured (next oportunity i will) but i think it should be bad (high dc voltage).
What to do first(with no osciloscope to "follow" the signal?
-change two caps and 2 resistors and hope for the best?
- if the problem remains....change de transistors from the pre-amp section?
- change the 2 integrateds that "process" the xover and stuff?(really demanding on by average-to-lower soldering capabilitys)
- change the power output transistors (as they were surely abused)?
What am i seeing wrong?
Am i way over my head?
My unit had issue with he woofers...long story short: the spiders had de-glued almost completly from the center cilíndrical winding thing and the woofers would under perform, and distort even at médium usage. The previous owner abuse the thing to get the "amount" of Bass it needed. The dust caps were partially detached and "ading" some noise to the mix. I removed the dust things put some peaces of paper to recenter the woofer, re-glued the spider, waited 24h, removed the ppieces of paper, tested them and glued the dust caps back.
This exposed the fact that the amp did get some abuse. (never really used it i get around to fix it....only teste it trought he high level inputs):
Symptom 1- connect by high level (sinal from the speakers) it under perform in the sense you have to pushed it over 75% to get loudish(poor quality basse. ..worse than my kef psw1000.2)not how it should be.
Symptom 2- conected with the line in (s) is where things got really weird. Even without the volume all to the minimum it played really loud and the volume only starts to take efect(even more loud) over 75% of the volume button reach. I even tried directy from the analog out of two different blu-Ray players and its the same.
With only symptom one i would start by replacing the 2 big filter caps ( one seams just maybe a bit bulgy....) and the R165/R165 that are kinda tosted...4.7ohm by striker color that mesured 9 ohms in-circuit(i know). But with symptom 2 things mighty more complicated.
The output has really low vdc with no inputs, the same with high level inputs. With line in inputs i didn't measured (next oportunity i will) but i think it should be bad (high dc voltage).
What to do first(with no osciloscope to "follow" the signal?
-change two caps and 2 resistors and hope for the best?
- if the problem remains....change de transistors from the pre-amp section?
- change the 2 integrateds that "process" the xover and stuff?(really demanding on by average-to-lower soldering capabilitys)
- change the power output transistors (as they were surely abused)?
What am i seeing wrong?
Am i way over my head?
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