JBL 4429, deep bass ?


Hi, i have bought pair 4429. They have aprox 40hs.

I have had 4312SE and i hear more deep bass than 4429. I see tight bass in a 4428

This could be ?

im using mc275.

Manual: FREQUENCY RESPONSE 40Hz – 45kHz (–6dB)
CROSSOVER FREQUENCIES 800Hz, 7kHz 


mati1979
It does not look like I can insert the PDF file here. The rolloff starts at 40Hz, but judging from the file date the speakers were only a couple of months old. I know the bass improved quite a bit after a year.
Update!!  My 4429’s sound even better now...got some anticables involved which are by far the best cables I’ve owned (owned $20k speaker cables).  Coltrane LIVES!!  For the would be audio cognoscenti, they play with greater dynamic freedom, realistic visceral bass, extended non fatigue inducing high’s and wide soundstage the competes and in most cases beats my previous Wilson’s and B&W’s to name just 2.  
Dave B which amp are you using with the JBL. What kind of stands are you using. 

Does anyone know or seen the impedance/phase graph? I want to use a 300b 8 watts amp.