Altec Lansing 9444A amp clipping problems

elambert · 12th April 2005, 06:49 AM

Hoping the gurus here can help me sort out the problems I'm having with my amp. I recently build a rather large sub cabinet for my home and after hooking it up to the amp, the amp keeps clipping as indicated by the leds on the front panel.

The sub is a Dayton Quatro 15 in a ported configuration tuned to 20hz, the amplifier is Altec Lansing model 9444A rated at 300w x 2 (4 ohm per channel) or 600w x 1 (8 ohm load). At first I thought it may have been a bad box design however here is what I have done so far to test. BTW the amplifier is hooked up to my Yamaha HTR-5150 Receiver through it's sub outputs. As the Altec is a pro unit with only balanced line input, the sub output from the receiver is fed into an ART cleanbox to convert from the unbalanced output to balanced input.

The amp would clip when the volume is turned up on music, movies and pretty much anything. I have played with many different gain setting combinations on the amp and cleanbox to rule out that. I also tried hooking the sub up to each channel on the amp individually and also tried it bridged and it clips in all modes I have also seen one of the clip leds glowing even after the power has been shut off.

I tested the sub using WinISDs tone generator on a slow sweep from 15 hz to 200hz. Seems around 55hz I have some serious room gain and that is where the amp clips the worst. I even hooked the sub directly up to the receiver and ran the test sweeps. The sub needs some tweaking but even running off of the receiver (80w / ch) it was really a monster, but on the altec, it just turns to crap.

Sorry for the long post, just trying to give all the facts I have in the hopes that someone can help me out...

Thanks in advance,
Ethan

BTW, here's a pic of my monster I'm trying to power

elambert · 15th April 2005, 12:56 PM

Bump, anyone?

RyanD · 18th December 2010, 06:07 PM

I know this is an OLD thread.

What was your final resolution? Isn't the Dayton Quatro a 4ohm sub? Did you wire it bridged at 4 ohms?

I was thinking about using the same amp to power a passive sub.

12th April 2005, 06:49 AM	#1
elambert diyAudio Member Join Date: Apr 2005 Location: Warner Robins GA	Altec Lansing 9444A amp clipping problems Hoping the gurus here can help me sort out the problems I'm having with my amp. I recently build a rather large sub cabinet for my home and after hooking it up to the amp, the amp keeps clipping as indicated by the leds on the front panel. The sub is a Dayton Quatro 15 in a ported configuration tuned to 20hz, the amplifier is Altec Lansing model 9444A rated at 300w x 2 (4 ohm per channel) or 600w x 1 (8 ohm load). At first I thought it may have been a bad box design however here is what I have done so far to test. BTW the amplifier is hooked up to my Yamaha HTR-5150 Receiver through it's sub outputs. As the Altec is a pro unit with only balanced line input, the sub output from the receiver is fed into an ART cleanbox to convert from the unbalanced output to balanced input. The amp would clip when the volume is turned up on music, movies and pretty much anything. I have played with many different gain setting combinations on the amp and cleanbox to rule out that. I also tried hooking the sub up to each channel on the amp individually and also tried it bridged and it clips in all modes I have also seen one of the clip leds glowing even after the power has been shut off. I tested the sub using WinISDs tone generator on a slow sweep from 15 hz to 200hz. Seems around 55hz I have some serious room gain and that is where the amp clips the worst. I even hooked the sub directly up to the receiver and ran the test sweeps. The sub needs some tweaking but even running off of the receiver (80w / ch) it was really a monster, but on the altec, it just turns to crap. Sorry for the long post, just trying to give all the facts I have in the hopes that someone can help me out... Thanks in advance, Ethan BTW, here's a pic of my monster I'm trying to power

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15th April 2005, 12:56 PM	#2
elambert diyAudio Member Join Date: Apr 2005 Location: Warner Robins GA	Bump, anyone?

18th December 2010, 06:07 PM	#3
RyanD diyAudio Member Join Date: Dec 2010 Location: Tx	I know this is an OLD thread. What was your final resolution? Isn't the Dayton Quatro a 4ohm sub? Did you wire it bridged at 4 ohms? I was thinking about using the same amp to power a passive sub.

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