[Seeburg DDS-1's with Altec H-811 horn and dual 15" Utah Drivers]

Thanks also.  I will check to see that the woofers are in phase. 

[Seeburg DDS-1's with Altec H-811 horn and dual 15" Utah Drivers]

That makes sense.  Thanks very much. It’s strange that when I hook up the second woofer, it doesn’t sound louder or better, it just loses some low end bass. Any idea of what improvements I can expect with new capacitors?

[Seeburg DDS-1's with Altec H-811 horn and dual 15" Utah Drivers]

I am currently working on a set of these. Put them together without sound deadener for some preliminary testing and just for fun.  I swear they sound better if I leave one woofer disconnected. With both woofers the bass sounds muted. With only one you get a nice low subwoofer thump out of them. How is this possible?  Can I do something to get that with two woofers?  Any guidance to improve these classic speakers will be much appreciated.