I am looking to replace the drivers in an old pair of Phase Tech PC-60 II speakers. The original 6.5 in 4 ohm (styrofoam cone) woofers are gone but everything else is original and mint. Sealed box .35 cuft., nice 4th order Linkwitz-Riley crosses over at 2000khz. Any suggestions? Would like to get 60-70hz usable LF response if possible. A local speaker supplier has a few options available: #1 is FS-60HZ, XMS-3.5, QMS-3.5 QES-.73, QTS-.61, VAS-.42, XMAS-2.55, #2 is FS-34HZ, QMS-3.3, QES-.28, QTS-.26, XMAS-.26. Not sure if either of these is workable.
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Have made the inquiry with the distributor as it was not listed in the specs. There is also a 3rd option: FS-46HZ, QMS-6.31, QES-.97, QTS-.86, VAS 9.91L / .35 cuft, xmax 4 mm.
Your call since the calc'd alignment is somewhat under damped Vs the 0.707 max flat alignment, though you can always stuff to 'taste' with pillow stuffing or similar using your ears if you find it sounds to 'loose'.
Taineasy,
what brand are these units? #3 has favorable parameters for a more succesful sealed cabinet than #1, imo. Still, realistic values could be different from published, especially if these are cheap products, according to my limited experience.
what brand are these units? #3 has favorable parameters for a more succesful sealed cabinet than #1, imo. Still, realistic values could be different from published, especially if these are cheap products, according to my limited experience.
#3 is a Goldwood GW6PC4-4 from a speaker distributor called Q-Components. Its a cast frame, poly mica cone, rubber surround and vented pole. They have one other 6.5" driver but it is a 6 ohm (my crossover is designed for a 4 ohm) with a very low QTS of .26 (more suited for ported enclosure?). Its a nice driver (Pioneer) with kevlar cone, rubber surround and cast basket but not sure how the higher impedance would affect the crossover point and overall sound quality. Its specs are: FS-38HZ, QMS-3.05, QES-.28, QTS-.26, VAS-26.6L / .92 CU.FT, XMAX- 3.75.
GW6PC4-4 does not seem like a good candidate, frequency response reveals bad resonances and a downward tilt probably because of high voice coil inductance. There is better manufacturers, Visaton WS17E-4 is a very well behaved cone midwoofer, exactly for a sealed cabinet, W170S-8 also.
https://www.diyaudio.com/community/...sealed-simple-loudspeaker-build-plans.352046/
There is other brands, search Parts Express, Madisound, Meniscus...etc
Can you specify crossover filter schematic with values?
https://www.diyaudio.com/community/...sealed-simple-loudspeaker-build-plans.352046/
There is other brands, search Parts Express, Madisound, Meniscus...etc
Can you specify crossover filter schematic with values?
I'll give it a look later, those polarized C and C2 usually are and should be non-polarized unless connected so they form a non-polarized version.
Not only parameters matching cabinet loading, FR of the midwoofer with appropriate filtering should also match tweeter high pass. To do this totally correct, measurements are needed. Are you very particular about sound quality?
