My Altec 605A Duplex with N-1600-C has been in a garage for 25 years. I only found one speaker and the plywood enclosure was too large and ugly. I removed the speaker from the enclosure to examine it. Looks OK, has black surround. Then I tested speaker on the floor connected to a 8 OHM receiver set on mono with bass turned up. I'm getting very little bass. Does the enclosure boost the bass? I turned the dial on the N-1600 but it didn't boost it much. I seem to remember it sounding better back in the 80's.