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Thread: Running 4 speakers |
    
New member Username: Rickjt62
Post Number: 1
Registered: Jan-08
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| Posted on Monday, January 07, 2008 - 01:01 pm: |
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Hi (:
I'm new here so this topic has probably been covered somewhere in the archives on many occasions
However, I am running four Mission (pair of M33i & pair of M73i) off a Cambridge Audio Azur 540R V2 amplifier - even at a reasonable volume, I am finding that the amp is clipping out
Short of buying new speakers (which is a possibility), how can I avoid this?
I am aware of the ohmage being halved when using four speakers but my knowledge is limited as to how to resolve the issue
Thanks
Rick |
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Platinum Member Username: Jan_b_vigne
Dallas,
TX
Post Number: 11989
Registered: May-04
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| Posted on Monday, January 07, 2008 - 06:42 pm: |
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What's "reasonable Volume"?
And how do you know the amp is "clipping"? |
New member Username: Rickjt62
Post Number: 2
Registered: Jan-08
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| Posted on Tuesday, January 08, 2008 - 12:13 pm: |
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12 o'clock on the dial ... it just shut's off! |
Gold Member Username: Nuck
Post Number: 9556
Registered: Dec-04
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| Posted on Tuesday, January 08, 2008 - 05:52 pm: |
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That ain't clipping, it is life saver shutdown. |
Platinum Member Username: Jan_b_vigne
Dallas,
TX
Post Number: 12001
Registered: May-04
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| Posted on Tuesday, January 08, 2008 - 09:09 pm: |
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It would be unusual for an amplifier to clip with the vc at 12 O'Clock. If you have tone controls cranked to the max or you are feeding extremely heavy bass content from your source, then the vc position will be of no real consequence. What sort of music content are you playing at this volume?
I assume this takes awhile to occur. Do you have sufficient air flow and ventilation around and through the amplifier?
You'll need to find a measurement of the impedance curve and electrical phase angle of the speakers. The combined impedance will be half of the lowest impedance pair. Two eight Ohm speakers connected in parallel will be four Ohms for the amplifier. Four Ohms at high volumes is not easy on most mid priced gear. If the impedance dips lower than four Ohms for the combined load, you are simply asking too much of the amplifier. If the electrical phase angle has a large inductive or capacitive component, particularly at the same frequency range as a low impedance point, the amplifier is not capable of supplying sufficient current into the laod and is shutting down to 1) save itself and 2) give you a big dope slap upside the head.
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