I play occasionally in a blues/R&B group. It's not very loud and we have a good PA. I normally don't need my rig to put out a lot of volume but every now and then we play an outdoors gig where it might be needed. I could use a bit of help in figuring out how to make the best use of my amps and cabs, since I've been changing out most of it. I will have available the following gear: GK MB500 amp (on backorder from MF) SWR SM-400, which has two amplifiers @ 200 watts each into 4 oms. Carvin BRX 10.2 NEO cab (4 oms; 600 watt power handling) Altec 1x15 from the early 70's (8 ohms, I have no idea of the power handling) I should be able to use the MB500 with the Carvin cab for most gigs. To get more volume I'm wanting to use the SWR SM-400, which has two amplifiers @ 200 watts each into 4 oms, as a slave amp running the Altec cab. The MB500 has a Headphone/Line out/Chain out jack and the SWR has an effects loop with a "Return Mono" jack. Can I simply run a cable between the amps or is there something I'm missing? If this works at all I assume this will only be able to use one of the SWR's two amps. Are there any options to add another cab to the MB500 (when I already have a 4 ohm load on it)? I bought the Altec speaker over 40 years ago so really don't want to get rid of it. Thanks in advance for any advice.