Post by SuperComplex on Aug 8, 2013 15:45:23 GMT -5
I'm new to all of this and this may seem like a silly question but, If the PA 7 has more watts and it takes 10 times the watts to increase dB's by 10, What makes the XPA 5 better? Or have I totally missed how this all works?
XPA-5 is 5 x 200 W, PA 7-150 is 7 x 150 W (so less power per channel).
I'm not sure how it relates to your 10 dB question.
"In order for one amplifier to reproduce sound twice as loud as another in Decibels you need 10 times more wattage output. An amplifier rated at 100 WPC is capable of twice the volume level of a 10 WPC amp, an amplifier rated at 100 watts per channel needs to be 1,000 watts per channel to be twice as loud. In other words, the relationship between volume and wattage output is logarithmic rather than linear." - Robert Silva
So, does the extra 50 watts of power really sound that different?
I vote the PA 7-150, even if you don't need 7 channels it's always nice having spare channels to use for say 2nd zone speakers/outdoor speakers. Unless you have some really really hard to drive speakers then the XPA-5 but the PA 7-150 is an incredible deal, don't wait and miss out on it.
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Agreed with both RW and Creimes. The additional 50 W would be pretty meaningless (which is why it's hilarious to see all the mainstream AVRs differ from each other by 10 W within each brand's lineup), but it is nice to have spare channels for additional zones (or for bi-amping if you want to go that way).
The pa-7 is 150X7 but that's the all channels driven rating. The "only 5" channels driven rating is likely higher and if I had to guess nearly equivalent to the XPA-5. The amp shares the same power supply with all the channels, so it's really only limited by the amp blades or circuitry in terms of the power it can deliver. EG, the UPA-500 is able to deliver around the same amount of power two channels driven as the UPA-200.
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