Lexicon CX-7

[Spokanegolfer]

Just curious if there are any compatibility issues with a 15 year old Lexicon Amp and a brand new Marantz AV8805 pre-amplifier? The system would primarily be for Home Theatre.

Thanks

 

[lovinthehd]

Don't know why there would be unless there's some drastic difference in pre-out level and amp sensitivity level....what model of Lexicon amp?

 

[Spokanegolfer]

Yes, it's the Lexicon CX-7. They both have RCA & XLR connections.

 

[lovinthehd]

Yes, it's the Lexicon CX-7. They both have RCA & XLR connections.

LOL sorry, I forgot to check the title once I opened the thread. From this it seems you likely won't have a problem with the Marantz pre-pro driving the amp https://www.soundandvision.com/content/lexicon-cx-7-amplifier-ht-labs-measures

 

[lovinthehd]

Dug a little more and found a manual, which indicates sensitivity spec on the CX7 is:

2V input for 100W output at 8Ω, balanced inputs

1V input for 100W output at 8Ω, unbalanced inputs

 

[Spokanegolfer]

Good to know! I didn't realize that they were different. Planning on using balanced. I see that the Marantz has an
Unbalanced RCA input : 200 mV
Balanced XLR input : 400 mV Guess I'm not sure of the math formula, can I crank it to 80% or more?
Thanks!

 

[lovinthehd]

Good to know! I didn't realize that they were different. Planning on using balanced. I see that the Marantz has an
Unbalanced RCA input : 200 mV
Balanced XLR input : 400 mV Guess I'm not sure of the math formula, can I crank it to 80% or more?
Thanks!

The input sensitivity of the Marantz is relevant to whatever sources you'll use with the Marantz. The pre-out level is spec'd at 1.2V for unbalanced, 2.4V for balanced, and these appear to be nominal ratings. If inclined to do the math, might confirm using this article https://www.audioholics.com/audio-amplifier/amplifier-voltage-gain