I think my preamp cooked my speakers HELP

merickrc · 11th March 2009, 03:37 PM

hooked up the preamp last night and it sounded distorted when i turned it up i looked over at my speakers and the woofer cone was flexed all the way out like the speaker was tring to turn it self inside out i went over to the speaker and it was smoking so i disconected the preamp hooked up my cd player to the amp then tried the speakers now the mids and highs are all crackely i think the speakers are shot what do you think let me know thanks merick

AndrewT · 11th March 2009, 04:00 PM

No DC blocking capacitor in the source output nor in the power amp input.
No DC detection circuitry in the power amp.
No speaker protection fuses in the supply rails of the power amp.

analog_sa · 11th March 2009, 04:18 PM

The sickening smell of burning speaker-flesh. A tube amp will never do this. Not counting OTLs.

pacificblue · 11th March 2009, 05:01 PM

Quote:

Originally posted by merickrc
i think the speakers are shot what do you think let me know thanks merick

At least the woofers and maybe some components in the crossover. The other drivers should have survived. Disconnect the woofers and check, if the crackling goes away. Maybe it is the protection cicruit reacting to the partly fused voicecoils.

merickrc · 11th March 2009, 05:59 PM

ok does anyone know what to do about this the speakers are fostex 207e f range so how can i check to see what caused the problem im new to this how do i take a reading with a metter and what setting should it be on

Puffin · 11th March 2009, 08:11 PM

give us full details of the pre-amp and power amps.

merickrc · 11th March 2009, 08:25 PM

this is the amp that i built

http://www.chipamp.com/lm1875.shtml

here is the pre amp that i built it a bugal

http://www.hagtech.com/bugle.html

any help would be great

merickrc · 11th March 2009, 08:30 PM

im sorry the chip amp i built is the LM3886 Amplifier Kit

http://www.chipamp.com/lm3886.shtml

Groundloops · 11th March 2009, 09:23 PM

Did I get that right - The chain is CD player -> Bugle -> amplifier? You are aware that the Bugle is a RIAA phono preamp?

merickrc · 11th March 2009, 09:35 PM

no im sorry i had the recored player to the phone preamp hooked up to the amp then to the speakers after that i then took out the phono preamp hooked up the cd player to the amp

11th March 2009, 03:37 PM	#1
merickrc diyAudio Member Join Date: Jan 2009	I think my preamp cooked my speakers HELP hooked up the preamp last night and it sounded distorted when i turned it up i looked over at my speakers and the woofer cone was flexed all the way out like the speaker was tring to turn it self inside out i went over to the speaker and it was smoking so i disconected the preamp hooked up my cd player to the amp then tried the speakers now the mids and highs are all crackely i think the speakers are shot what do you think let me know thanks merick

11th March 2009, 04:00 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	overheated speaker No DC blocking capacitor in the source output nor in the power amp input. No DC detection circuitry in the power amp. No speaker protection fuses in the supply rails of the power amp. __________________ regards Andrew T.

11th March 2009, 09:23 PM	#9
Groundloops I´m amazed! diyAudio Member Join Date: May 2004 Location: Hamburg / Northern Germany	CDP into RIAA preamp? Did I get that right - The chain is CD player -> Bugle -> amplifier? You are aware that the Bugle is a RIAA phono preamp?

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11th March 2009, 04:18 PM	#3
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	The sickening smell of burning speaker-flesh. A tube amp will never do this. Not counting OTLs.

11th March 2009, 05:59 PM	#5
merickrc diyAudio Member Join Date: Jan 2009	ok does anyone know what to do about this the speakers are fostex 207e f range so how can i check to see what caused the problem im new to this how do i take a reading with a metter and what setting should it be on

11th March 2009, 08:11 PM	#6
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	give us full details of the pre-amp and power amps.

11th March 2009, 08:25 PM	#7
merickrc diyAudio Member Join Date: Jan 2009	this is the amp that i built http://www.chipamp.com/lm1875.shtml here is the pre amp that i built it a bugal http://www.hagtech.com/bugle.html any help would be great

11th March 2009, 08:30 PM	#8
merickrc diyAudio Member Join Date: Jan 2009	im sorry the chip amp i built is the LM3886 Amplifier Kit http://www.chipamp.com/lm3886.shtml

11th March 2009, 09:35 PM	#10
merickrc diyAudio Member Join Date: Jan 2009	no im sorry i had the recored player to the phone preamp hooked up to the amp then to the speakers after that i then took out the phono preamp hooked up the cd player to the amp

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