Can I sit at the big kid’s table now? Progressive Point Source?

JayMX
JayMX Posts: 446
edited October 2021 in Vintage Speakers
Yesterday was a very good day. BYU got beat by Baylor, Utah beat Arizona State and my beautiful 1986 SRS2’s were supplanted by a pristine pair of 2.3TL’s. One owner, bought in Okinawa in the early 90’s. Legitimately perfect condition, mine for $750! 😍 Cranked them up yesterday sound awesome. Very, very happy. 🤘🏻🤘🏻

I am curious if anyone can shed more light on the progressive point source tweeter arrays? I read the bit in the manual, but I’d like to better understand the physics going on there. I notice that the top tweeter has almost zero output, is that normal? Any of you smart guys care to share your knowledge? Thanks!

se9c6912ntdb.jpeg
w8f9496u86fc.jpeg
445xhaiz0qb7.jpeg
cmpaalicx73w.jpeg
mchq9dpd1vck.jpeg

Current Collection: Monitor 4a (Peerless), Monitor 5B (Peerless), Modified Monitor 7b (Peerless), RTA15TL (SL3000), SDA CRS+ (194’s), SDA SRS 2.3TL, R100's, R200’s, R300 🤩
Pairs that have passed through: Monitor 4b (Peerless), Monitor 5a (Peerless), Monitor 5b (SL1000), Monitor 5b (SL2000) (4x pair), Monitor 7b (Peerless), Modified Monitor 7c’s (194’s), Monitor 10a (Peerless), Monitor 10b (5x pair), RTA8, RTA8TL, RTA 11T, RTA12c (194's), SDA CRS, SDA 2 (2x pair), SDA 2a, SDA 2b, SDA 1b, SDA 1c, SDA SRS 2 (2x pair), SDA SRS 3.1TL (198’s) (2x pair)...and more to come, it’s a sickness.
· Share on FacebookShare on Twitter

Comments

  • txcoastal1
    txcoastal1 Posts: 13,281
    Well I know nuffin' except those are exceptional looking pair...congrats

    Bump for the guru's
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

    erat interfectorem cesar et **** dictatorem dicere a
    · Share on FacebookShare on Twitter
  • aprazer402
    aprazer402 Posts: 3,147
    Very nice looking. Great price too.

    This thread may help understand the PPS.

    https://forum.polkaudio.com/discussion/48222/sda-srs-srs-1-2-srs-1-2tl-srs-2-3tl-crossover-design-and-progressive-point-source
    · Share on FacebookShare on Twitter
  • Emlyn
    Emlyn Posts: 4,488
    edited October 2021
    Nice find! Those look like they’re fresh out of the box from 30 years ago. Even the TL tweeters aren’t looking tarnished at all and the butyl rubber surrounds aren’t browning. Doubt there’s a better looking stock pair out there!

    Progressive point source just means the high frequency response is spread in different ranges across all three tweeters. The speakers wouldn’t sound right with three tweeters all covering the same range. What you are hearing is normal but one way to check they are indeed all doing something is to put an empty paper towel roll up to each tweeter and listen through that. No need to put a white lab coat on first.

    · Share on FacebookShare on Twitter
  • pitdogg2
    pitdogg2 Posts: 25,436
    Bottom tweeter is full on, middle about 1/2 and as you noticed the bottom is very low.

    Nice grab! I enjoy mine, recapped and all goodies are even better
    · Share on FacebookShare on Twitter
  • VR3
    VR3 Posts: 28,638
    I have plugged the 2.3tl crossover in my software and essentially the upper tweeters are progressively less in volume but are crossed over the same. But the differences in volume are fairly substantial
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
    · Share on FacebookShare on Twitter