Adcom GFA-5002 specs?

[DaveFred]

Hello,

I am having trouble finding any info about the Adcom GFA-5002 power amp.

Here is the manual,

http://www.adcom-usa.com/userguides/GFA-5002-UG.pdf

I find the specs confusing,

(See attached pic)

The bridged watts seem a little funny and there is no mention of running the amp bridged at 4 ohm.

Do the numbers seem fishy to you?

Can I run this amp at less than 8 ohms in bridged mode?

Thank you,

David.

 

[rayma]

Can I run this amp at less than 8 ohms in bridged mode?

No, since an 8R bridged load is the same as a 4R load for each channel.
The amp would have to be rated for 2R/ch to handle a 4R bridged load.

Think of the middle point of the load as being at ground potential,
with the ends of the load having opposite polarities of signal.

 

[DaveFred]

I don't know the ohm rating for the speakers I want to use in bridged mode, but here is an impedance graph for them.

How do I know what the "average" impedance is and if they will blow the amp up?

 

[rayma]

I don't know the ohm rating for the speakers I want to use in bridged mode, but here is an impedance graph for them. How do I know what the "average" impedance is and if they will blow the amp up?

The average impedance rating isn't enough information to be sure about the suitability.
That speaker may work, since the impedance dips to 4R only in the 100-300Hz region.
If you don't drive the speaker too hard, there may not be a problem.