What is the basic difference in sound with putty on the all the baffle compartments vs with compartments unfilled except around the driver?
BMF 6v3: Less Is More?
I think Fostex purposely put the partitions and odd compartment shapes on the back of the baffles as an important part of the acoustic design. If so, filling them with plasticine may not be the best approach when modding.
This configuration was tuned with Audeze LCD2 as the reference. The sound signature is the same. The SQ is very close but the LCD2 with 5 times the driver size, 10 times the cost, and open design wins every time, IMO. That said, these sound really good to me for < $100.
1. BMF Tungsten Putty surrounding the driver on the back side of the baffle.
2. Back baffle panels and compartments unobstructed and unfilled.
3. Paxmate Plus in the interior cup floor, only.
4. Central chamber for headband hanger screw uncovered.
5. Stock white driver felt intact and in place. Reflex dot, tape, or felt tuning is optional.
6. Stock black bass port felt intact and in place. Bass port tuning is optional.
7. Dust cover chiseled off around the ear side of the driver; dust cover in place over driver.
8. One layer of Dynamat surrounding the ear side of the driver.
9. One layer of self-adhesive felt over the Dynamat.
10.Shure 840 pads.
My tungsten putty recipe surrounds the drivers. The baffle panels and compartments are unobstructed. White specks: residue left over after removing white plasticine from a previous mod. Paxmate Plus in the cup floor, only. Stock black bass port felt and white driver felt intact. Plasticine in the outer cup rim from a previous mod.
After chiseling off the dust cover, I cut and placed 4 pieces of Dynamat surrounding the driver. The dust cover is in place over the driver. Cardboard template for cutting out the felt cover in the next photo.
Self-adhesive felt over Dynamat to seal the goo and lift the ear pads. Notch cut for baffle equalization vent. Additional ear pad lifting with gauze is optional.
One large cotton ball pulled apart and placed in the cup over the Paxmate. This gives a different sound but not necessarily better than "empty."
Shure 840 pads. Additional pad lifting with gauze, etc., optional. They look better than stock but I think stock pads with rear lifters sound just as good and are just as comfortable.