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Please help. Why would higher power amp require gain? Marantz/Adcom

Hi,

This is my first post.

I recently connected my Adcom GFA-555 to the front preouts of my Marantz SR5015. I recently had the Adcom evaluated at a reputable repair business as I’ve owned it for 30 plus years. The Adcom had a clean bill of health.
I prefer to setup my speaker gains manually with a sound meter manually with slow C weighting at 75db. I set the Front Left speaker at 0db then turn the volume up to obtain 75db.
The Marantz receiver volume required was 84 where as with the Adcom it was 88. As a result the remaining 5 speakers required a reduction in db to balance out.
Hope this makes sense.....I was expecting a lower volume number on the Marantz to obtain the same 75db, as the Adcom is rated MUCH higher wattage.

Please explain.

Newbie
volfan72

Showing 3 responses by volfan72

volfan72 OP
3 posts
 
Thanks to everyone that has responded!!
I will also be adding a 5 Channel Adcom GFA 7500 once it returns from the repair shop due to a damaged binding post. I might revisit this with differences in db settings if applicable once that amp is added.
volfan72 OP
3 posts
 
Thank you for the response.

How difficult is it to determine the Marantz SR5015 Pre-Out voltage?

Also, the required voltage for my GFA-555 and GFA-7500?
volfan72 OP
3 posts
 
I now have the GFA-555 running my LR Fronts and the GFA-7500 running my Center, SLR, and SBLR.
I ran Audyssey again and then adjusted with a sound meter. Look at the gain difference between the Adcom amps. I’m thinking of moving the GFA-555 to the Surround Back LRs.
My Fronts and Center are identical NHT M7s. The Center is set at +2.0 db and the Front LRs are +7.5 db.

Maybe I’m just OCD and this is not an issue?

Thoughts?

Thanks to everyone responding!!!
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