Quieter when warmed up ???

[Stoby]

Bought a nice pair of quartets with the crites tweeter ,a couple weeks ago . When first hooked up to my Nad 2600 at low-med volume I was quite surprised at the bass strength . Strangely not many minutes later it seemed to have quieted . Turned volume up but just seemed like it lost some oomph. Checked drivers everything seemed fine. Shut it down tried again a few days later and same thing loud at first and then took a lot of power to get good volume but bass response not as good as when first on. Almost feel like i'm nuts.
Any explanation as to why or how they could become less efficient when warmed up ?

 

[Nyjblbob]

sounds like an amp issue, not the speakers

 

[moray james]

you would be wise to install all fresh gaskets on the woofer the horns the passive and the terminal cup. you would also be well served to run a bead of latex caulking on every seam inside the cabinet to make sure they are air tight and don't forget to seal off the holes where the grill plugs are installed they do leak. Air leaks in a passive system will kill your base and all your gaskets are very old and flat by now. you can test your Quartet for air leaks by using one hand to press in on the passive while you watch the woofer it should move out if you keep the passive depressed the woofer should take some time to move back slowly to its center position. If the woofer fall back to its center position quickly you have air leakage. hope this helps.

 

[Stoby]

Nothing wrong with my amp . Drives my other speakers fine . I'll check for leaks but don't understand how theyd lose efficiency from start up .Thanks

 

[moray james]

Nothing wrong with my amp . Drives my other speakers fine . I'll check for leaks but don't understand how theyd lose efficiency from start up .Thanks

it is all in the details. something else that you can check is the woofer and passive dust caps as they can come loose and leak air as well. eliminate all the possibilities and sooner or later you will figure things out. A bad electrolytic in the bass section might be at fault but to have both go bad at the same time is not very likely. sealing up your cabinets will only help and make your speaker better. good luck. one last comment. Changing out the gaskets is a good time for you to install some flat tooth picks with white wood glue into all the mounting holes as the wood screws and the vibration works the holes out over decades. Lay the speakers down so the glue cannot run out and wet each hole with white wood glue let set 30 minutes and trim flush to the surface with side cutter or a chisel. Do not be concerned that the hole is full as the picks will compress when you install the mounting screws insuring a snug airtight fit.