hi guys
just reading your insightful posts
latest update
less woofer excursion after using granite slab under table on craz rack - it eliminated or greatly reduced isolation
slightly warped records set it off, but most have much more minimal speaker pumping (I can live with if not damaging cartridge)
craz platform is floating and works great with electronics but not with turntables - I could tap it and get noise through the speakers - not now as I replaced it with 3cm granite
pumping is more pronounced on outer portion of record which fits with the warpage scenario
so I may have similar observations as what you saw at Doug's (room and port elements may add to this)
the arm is still resonating (as seen on the scope) - calculations and your experiences as well as Mehran's and Thom Mackris say this should work and it seemed to till I got a low end pre amp -the doshi
weight 1.75 ish - have the shim and adding a quarter on top of the cartridge didn't work either
I tried the mass counterbalance variations along the arm
room 15 by 27
I have system/speakers on long wall using Cardas nearfield setup
There is a dip in volume om the back wall behing the couch - increases two feet into the room
speakers 3 feet into room. CD's sound great in the room with no noticable freqency humps
haven't tried the speaker placement
do have some echo buster type iso panels I could stick between speakers and equipment
alignment is dead on as shown by scope with test records and hearing music
I have a heavy anvil I can use on the top of warped records
is the clamp more effective
the pumping at present isn't really audibly effecting the sound anymore or minimally except for warped records
Richard is also going to bring over a few other cartridges with lesser compliance and see if we can remove resonance
this may be as dan and bob suggested - live with it
I think I'm getting closer, just want to isolate this and tweak everything out of my system
enjoy music tolerate equipment ...
thanks for all the helpful insight,
much appreciated
just reading your insightful posts
latest update
less woofer excursion after using granite slab under table on craz rack - it eliminated or greatly reduced isolation
slightly warped records set it off, but most have much more minimal speaker pumping (I can live with if not damaging cartridge)
craz platform is floating and works great with electronics but not with turntables - I could tap it and get noise through the speakers - not now as I replaced it with 3cm granite
pumping is more pronounced on outer portion of record which fits with the warpage scenario
so I may have similar observations as what you saw at Doug's (room and port elements may add to this)
the arm is still resonating (as seen on the scope) - calculations and your experiences as well as Mehran's and Thom Mackris say this should work and it seemed to till I got a low end pre amp -the doshi
weight 1.75 ish - have the shim and adding a quarter on top of the cartridge didn't work either
I tried the mass counterbalance variations along the arm
room 15 by 27
I have system/speakers on long wall using Cardas nearfield setup
There is a dip in volume om the back wall behing the couch - increases two feet into the room
speakers 3 feet into room. CD's sound great in the room with no noticable freqency humps
haven't tried the speaker placement
do have some echo buster type iso panels I could stick between speakers and equipment
alignment is dead on as shown by scope with test records and hearing music
I have a heavy anvil I can use on the top of warped records
is the clamp more effective
the pumping at present isn't really audibly effecting the sound anymore or minimally except for warped records
Richard is also going to bring over a few other cartridges with lesser compliance and see if we can remove resonance
this may be as dan and bob suggested - live with it
I think I'm getting closer, just want to isolate this and tweak everything out of my system
enjoy music tolerate equipment ...
thanks for all the helpful insight,
much appreciated