on the input channel selector you have three options:

2CH BB ALL
2CH
4CH

2 and 4 CH I get what is 2CH BB ALL? I can't seem to find anything on it in the manual.

 

Bass Boost

 

2CH Bass Boost all? My KS125.2 had a bass boost switch. From what I saw in the manual online, the 600.4 has the bass boost dial on it too. My guess is this position activates the bass boost feature.

 

So it lets you use Bass Boost on all 4 channel on the output with a 2 channel input?

Cool beans, than you sir.

 

Just a guess on my part. I have yet to get my hands on a 600.4. Maybe one of the regulars will come in and confirm. Try it out and report back.

 

I must've posted at the same time as haze. I didn't see his post.

 

Yup. Otherwise there's bass boast on just channels 1 and 2.

 

The Arc manual is lacking in some areas. Never specifies use channel 1&2 for input on 2 channel, The BB mention, and some other minor things. Obviously it is slightly revised from their other manuals of similar amps. I'm old school, so from outside a pop top amp like Orion hcca, and an Xtant I had , there was no input switches,etc. The 2 mentioned had to use modules for xover points. So once adjusted I get the switch concept and ALL will use channel 1&2 for the 2 channel input. Just be nice to have it in writing, as when I installed my 600 I called since it wasn't mentioned, was told al 4 needed inputs and use y splitters. Now I have $50 in y splitters I'll never use since the tech didn't know their product and figured it out myself after the fact. Poorly written manuals just **** me off.