Woofer pumping WHY??


Hello All, I have an older REL B2 series. I love this sub. I recently received a new Project Xtension 10 with Clear Audio Maestro Ebony v2. After a couple days I noticed bad woofer pumping on several records I like to listen too. When I brought it up to Needle Doctor they told me it was my records and said it worked fine in there store. Now my REL is blown! I am so upset at myself for not taking this matter more seriously. Now I am purchasing a KAB rumble filter because I am not going through this again. Is this a cartridge mismatch?? Because on my REGA with Dynavector 10X5 It did not do this woofer pumping nearly as bad. AND I do remember putting a DENON DL103 on my RB301 and this same woofer crazy action occurred!! Immediately took it off that arm. I just spent $4100 for this Xtension10/CA Maestro and now I am scratching my head. Hmmmm.
128x128mattmiller
Mattmiller,I standby that the cartridge arm combo is not a
good combination,and will wreak havoc. The sound is good
because the problem is in the subsonic region that you will
not hear. If you don't address this you will have the problem till
the cows come home. You should get the filter if you think
that will work and return it if it does not fix the problem. BTW,if
the NeedleDoctor tells you there is not a problem then he
should go back to med school ! You should get a test record
with the resonant frequency test. I use the Shure TTR 115
ERA lV,you can find them on Ebay for about $20 bucks. The
other fix is to get a higher compliance cartridge or an arm with
more mass.
Yogiboy , no doubt you are correct,used to see it all the time back in the day with heavy arms and HIGH-compliance carts.
Do you,or anyone else, have recommends for higher compliance MM carts readily available ?
Schubert, Ortofon,Grado,and some Soundsmiths all have medium compliance and will work with a tonearm that is from light to medium. I don't think they make super high compliance cartridges and super low mass arms that was the fashion many moons ago. I was kind of surprised that the arm the OP has was only a low 8.5 grams mated with a cartridge with a low compliance
Hi Matt, had the same problems after my Lyra Kleos was to repair. When i got it back the compliance was softer and i had this pumping. Look here Video

The deflection of the needle because the decentered records correlates with the woofer pumping.

No i have an EMT JSD6 which a lower compliance and on the loudest volumes no pumping.