Ah, ported, of course. That pretty much answers that. Off to the garage then.
Yes, I am quickly becoming a huge fan of the 630 twin powered receiver. While waiting for my 3.2s to show up I have been using it drive my old Advents with tremendous results...it is a really fine sounding receiver...just gobs of headroom.
It looked really ugly when I found it...just covered with dust and filth. But it powered up and most of the dial lights worked, so I of course had to buy it. I was leary as the seller said she had it in the attic for a couple of years (North Carolina summers make for super hot attics that will ruin the caps). But upon getting it home I opened it up and found that it was actually really clean on the inside and nothing looked worse for wear. Cleaned the pots and controls and fired it up. And wow. Probably the best sounding vintage receiver I have had, and I have had a few nice ones (Pioneer sx1250 and sx3900, Sansui G5500, Yamaha cr820). It is indeed a keeper!