Hafler SE240 and Mono 4 Ohm - AVS Forum
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post #1 of 4 Old 11-11-2012, 12:51 PM - Thread Starter
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I was thinkin of using My two channel Hafler to drive my Center channel 4 ohm speaker.

The manual for the Hafler SE240 states
stereo - 120wpc 8ohm;175wpc 4ohm
However Mono

Connections for Monophonic Operation
When you wish to drive a single loudspeaker with increased
power capability, the SE-240 can be operated in
a bridged mode which drives both channels with the same
signal and combines their output to deliver more than 350
watts into 8 ohms. In this arrangement, the speaker is
connected only to the two red output terminals. The left
red terminal is +, and the right red terminal is the -
connection. No connections may be made to any black
terminal. Set the Mono/Stereo switch to Mono, and connect
the input signal to the left channel input only. Important
Note: Never use a speaker with an impedance of less
than 8 ohms when operating the SE-240 in the bridged
mode; the increased current output could damage the
amplifier.

My Miller Kreisel Center Speaker specs are
One 1" silk dome tweeter, two 5 1/4" polypropylene mid-bass drivers; Frequency response 72 Hz - 20 kH; 2 dB; Nominal impedance 4 Ohms; Bi-wirable; Power handling 200 watts rms; Sensitivity 90 dB/w/m; Size 14 3/4"H x 8 3/8"W x 8"D; Weight 18 pounds each

I would expect a note of caution in the manual and expected to proceed to configure to mono and drive this speaker. However, the manual provides a prohibition not a caution, saying "Never". Any thoughts?
My setup is Integra dtr-7.8; I could simply drive it with the receiver. Actually don't think I would even need to set the receiver to 4 ohm. I don't use high volume...
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post #2 of 4 Old 11-11-2012, 01:56 PM
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^^^

don't bother bridging it if you are going to use it... just use one channel....

i wouldn't even bother using it...

- chris

 

my build thread - updated 8-20-12 - new seating installed and projector isolation solution

 

http://www.avsforum.com/t/1332917/ccotenj-finally-gets-a-projector

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post #3 of 4 Old 11-11-2012, 04:18 PM - Thread Starter
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Thanks for the opinion. I will just use the center 4ohm on the Integra. I take it that it doesn't matter for a number of reasons -

-not drawing enough current/power to in use
-switch to 4ohm on integra does nothing but safeguard the unit from drawing too much power by reducing what is available accross all channels
-Hafler doesn't care if you use one channel and it provides 175wpc at 4 ohm
- Bridged Hafler's statement don't use with 4 Ohm really means there is no benefit as the max should still be consided approximately 175 wpc at 4 ohm
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post #4 of 4 Old 11-11-2012, 04:35 PM
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the reason you don't want to bridge it is because then the amplifier "sees" a load with the impedance halved... thus it would see a 4 ohm load as 2 ohms...

yup, leave the impedance switch on the integra at "8"...

- chris

 

my build thread - updated 8-20-12 - new seating installed and projector isolation solution

 

http://www.avsforum.com/t/1332917/ccotenj-finally-gets-a-projector

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