Sub Impedance

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chrisp83

Member - Posts: 6

Joined: April 25, 2005

Location: Botswana

Posted: August 11, 2005 at 9:45 AM / IP Logged

Quick question,

I have a 250W 2 Channel amp that is said to work at 4ohms. If i connect a 4ohm sub in bridge mode across the 2 channels, am i overloading the amp, or will it work fine?

blackmica3

Copper - Posts: 128

Joined: August 07, 2005

Location: United States

Posted: August 11, 2005 at 9:51 AM / IP Logged

Will work fine.

haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: August 11, 2005 at 10:37 AM / IP Logged

If the amp STATES SPECIFIECALLY it is only 4 ohm stable, no it will NOT work fine. A 4 ohm load, bridged, is equivalent to a 2 ohm load per channel. This is twice the load the amp is designed to work at, and it will either protect itself by shutting off, or if a cheap amp, fry itself, because of lack of protective circuitry.

What kind of amp IS it?

It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: August 11, 2005 at 11:31 PM / IP Logged

Do they have amps in Botswana that are only stable at 4 ohms/channel or higher?

And it makes me wonder.........have I seen any amps at all that are only stable at 4 ohms per channel? I don't think so....but then, I'm an nOOb.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

chrisp83

Member - Posts: 6

Joined: April 25, 2005

Location: Botswana

Posted: August 12, 2005 at 1:53 AM / IP Logged

@stevdart this is a very cheapie sansui SCS-652PZ amp.

Its says on the stats "speaker impedance 4 ~ 8 Ohm allowable"

So this gives me the impression that it is only stable at 4 Ohm per channel. And since it is a real cheap amp, im sure it doesnt have protection circuitry so it will fry itself like haemphyst says.

Anyway, i just wanted this info coz the amp is lying around and im looking for something to do with it.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: August 12, 2005 at 6:18 AM / IP Logged

Ok, here's the test: if the amplifier is bridgeable, in that it has markings on the terminals showing which ones to use and says "bridged"....and...

.....knowing that 4 to 8 ohm speakers are allowable.....

....it would mean that it is 2 ohm stable per channel. However, if bridging is not an option with this amp, that would mean that it is only stable to 4 ohms/channel. (Almost all two channel amps tell you that 4 ~ 8 ohm speakers are to be used.)

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: August 12, 2005 at 10:04 AM / IP Logged

Actually a lot of older MOSFET stereo or 4-channel amps are minimum 4-ohm stable and will blow if connected to a 2-ohm load. Many cannot be bridged at all. I don't know anything about the Sansui model you have, but I'll bet it is min 4-ohm stable per channel and if it's bridgeable, it must be into 8-ohms or higher.

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Sub Impedance

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