HI there. I have looked through the forums for a thread addressing my particular problem and did not find one so I am posting this here.
I have 4 sets of JBL speakers - 2 pairs of 4208's, 1 pair 4311B, and 1 pair L300 Summits.
The problem I am having is with the L300's. I am running these speakers on an SAE 2900 preamp and a SAE 2400L power amp (200W pc). I am not getting nearly the bass output from the speakers with all tone controls at flat that I think I should be hearing.
I have tested with another known good (NAD) power amp as a friend suggested the caps may be drying out in the SAE power amp. He runs his L300's on either an SAE 2400 or an SAE A501 and his sound great.
My room is insulated and sheetrocked. The floor is solid cement covered by underlayment and your standard fake wood flooring.
I have the L300's sitting on their built in stands (rectangle box of particle wood with small feet on the corners).
Anyone have any idea what I might look for or try? Do I need to use floor spikes? I saw a thread about spikes with differing opinions about their actual value in improving sound.
When I goose the low frequencies at the preamp, I start to hear decent bass that I think should be present with the tone controls flat. I know the woofs can put it out and they are the correct drivers in both speakers (I bought them used so I checked first.)
Could it be components in the crossovers? Both of them?
I checked speaer cables for in-phase wiring and its all good. I have not tried to reverse the phase yet.
Its just a mystery to me why this isn't putting out more low end with tone all at flat.
Thanks for any and all info! I hope to get my speakers and system posted here at some point now that I have a new listening room.
Best regards,
Jim K.