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#1
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
I'm using a dbx active crossover feeding a couple old adcom amps.
I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. It is the active crossover causing it because if I leave it out of the system I don't have a problem. Probably because the crossover is professional gear and not designed to be powered on and off while in use. I solved the power on pop by adding a delay to the amp turn ons. I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. Any solutions? Or add on circuits? |
#2
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
On Apr 8, 8:17*am, wrote:
I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. *It is the active crossover causing it because if I leave it out of the system I don't have a problem. *Probably because the crossover is professional gear and not designed to be powered on and off while in use. *I solved the power on pop by adding a delay to the amp turn ons. *I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. *But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. *Any solutions? *Or add on circuits? To be fair to the dbx, the fact that I am hooking it to unbalanced inputs on the amps probably contributes. |
#3
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
wrote in message ... I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. It is the active crossover causing it because if I leave it out of the system I don't have a problem. Probably because the crossover is professional gear and not designed to be powered on and off while in use. I solved the power on pop by adding a delay to the amp turn ons. I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. Any solutions? Or add on circuits? Adcom, and I'm sure others, sell a power conditioner (model ACE-515 is one I have seen) which has dedicated outlets for power amps which incorporates a built-in delay for turn-on. The power amps need to be powered up last, or some sort of time-delay muting function added, either via a relay or an RC-timed circuit which depowers the input differential pair (ala H-K). There is nothing wrong with any of your equipment. |
#4
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
On Apr 8, 5:44*am, wrote:
On Apr 8, 8:17*am, wrote: I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. *It is the active crossover causing it because if I leave it out of the system I don't have a problem. *Probably because the crossover is professional gear and not designed to be powered on and off while in use. *I solved the power on pop by adding a delay to the amp turn ons. *I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. *But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. *Any solutions? *Or add on circuits? To be fair to the dbx, the fact that I am hooking it to unbalanced inputs on the amps probably contributes. Wouln't make a bit of difference balanced vs unbalanced. Some units - typically the ones that run on single polarity power supply and need to charge up input / output capacitors almost always pop at power up / down. Daves solution will fix you right up. G² |
#5
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
On Apr 8, 11:10*am, wrote:
On Apr 8, 5:44*am, wrote: On Apr 8, 8:17*am, wrote: I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. *It is the active crossover causing it because if I leave it out of the system I don't have a problem. *Probably because the crossover is professional gear and not designed to be powered on and off while in use. *I solved the power on pop by adding a delay to the amp turn ons. *I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. *But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. *Any solutions? *Or add on circuits? To be fair to the dbx, the fact that I am hooking it to unbalanced inputs on the amps probably contributes. Wouln't make a bit of difference balanced vs unbalanced. Some units - typically the ones that run on single polarity power supply and need to charge up input / output capacitors almost always pop at power up / down. Daves solution will fix you right up. G²- Hide quoted text - - Show quoted text - I added a delay on to my power amps and that solved the power up pop. But I still have the power down pop. I thought about creating a delay power off for the crossover but screwing around with the powering sequence is getting complicated. I'm thinking maybe I should be messing around at the amp outputs instead. |
#6
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
Dave wrote:
wrote in message ... I'm using a dbx active crossover feeding a couple old adcom amps. I've rigged it all to go on and off controlled by my "pre-amp" power. But I get a substantual power on and off pop from both amps. It is the active crossover causing it because if I leave it out of the system I don't have a problem. Probably because the crossover is professional gear and not designed to be powered on and off while in use. I solved the power on pop by adding a delay to the amp turn ons. I already had an electronic switch on the amps because the preamp can't supply that kind of power from it's switched output. But I still have the power off problem and playing games with the power on/ off sequence is getting complicated. Any solutions? Or add on circuits? Adcom, and I'm sure others, sell a power conditioner (model ACE-515 is one I have seen) which has dedicated outlets for power amps which incorporates a built-in delay for turn-on. The power amps need to be powered up last, or some sort of time-delay muting function added, either via a relay or an RC-timed circuit which depowers the input differential pair (ala H-K). There is nothing wrong with any of your equipment. But to get rid of the turn-off pop,you'd need to delay the turn-off of the dbx,and turn the amps off first. |
#7
Posted to rec.audio.tech,sci.electronics.basics
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power on/off pop problem
In article ,
PhattyMo wrote: Adcom, and I'm sure others, sell a power conditioner (model ACE-515 is one I have seen) which has dedicated outlets for power amps which incorporates a built-in delay for turn-on. The power amps need to be powered up last, or some sort of time-delay muting function added, either via a relay or an RC-timed circuit which depowers the input differential pair (ala H-K). There is nothing wrong with any of your equipment. But to get rid of the turn-off pop,you'd need to delay the turn-off of the dbx,and turn the amps off first. Some years ago I build a power controller to do precisely this. One outlet for distribution to the source components, one to the Marchand active crossover (which quite conveniently has an output-muting relay) and two for the two power amplifiers. Each output is controlled via a power relay, and the relays are driven by RC-timed circuits which have settable "attack" and "decay" times. The power-amplifier relay system is actually a two-stage: a small solid-state relay switches in first (powering up the amps through an NTC anti-surge resistor) and then the main mechanical relay closes a second or so later. At power on, the power amps are turned on first, then the input stage, and finally the crossover (which unmutes the signal path once its output is stable). At power off, the power amps and crossover are turned off, and the input components switch off a couple of seconds later once the crossover muting relay has disconnected the audio path. Works really nicely... no nasty thumps on either end, and the slow-start circuit for the amp keeps the lights from dimming :-) -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#8
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power on/off pop problem
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