2A vs 1B

Dede
Dede Posts: 16
in Vintage Speakers
What are the performance differences (comparison-contrast) between the SDA 1B and 2A-is one considered preferable overall (understanding subjective preferences)-Thanks
· Share on FacebookShare on Twitter

Answers

  • Schurkey
    Schurkey Posts: 2,100
    edited June 2023
    Same generation of SDA speaker.

    The 2B is considered very coherent and preferable to the 1 series (at least in average/small rooms) around here. I've never heard one. I don't know about the 2A--never heard one of them, either.

    Aside from not being able to use non-common-ground amplifiers, and a preference for additional treble volume, I'm really happy with my re-capped 1Bs. And the treble issue is fixable if I wasn't so lazy.
    · Share on FacebookShare on Twitter
  • pitdogg2
    pitdogg2 Posts: 25,412
    Although I've not heard one I'm basing my judgment on myself having SDA 1 A's. I would think the SDA 1b would have better bass. I've had the SDA 2a, I completely recapped and went through the crossover adding Sonicaps, Axon and Mills resistors. I personally always thought they were a brite speaker. I didn't however put in the RD-0194 tweeters. With the SL2000 they were very in your face. The bass was not as deep as my SDA 1a speakers, once again crossover completely re-done with all Sonicaps.
    · Share on FacebookShare on Twitter
  • invalid
    invalid Posts: 1,363
    The 2A's are not bright after you change the tweeters, plus you can use RD0198 with the added cap just like the 2b.
    · Share on FacebookShare on Twitter
  • pitdogg2
    pitdogg2 Posts: 25,412
    invalid wrote: »
    The 2A's are not bright after you change the tweeters, plus you can use RD0198 with the added cap just like the 2b.

    No inductor change to use the 5.8 cap? I thought you had to.

    I was aware of the possibility only after I had finished and already spent a ton on two set of speakers.
    · Share on FacebookShare on Twitter
  • invalid
    invalid Posts: 1,363
    I didn't see any inductor change in westmass guy's 2A TL mod thread. They RD0198's sound great in my 2A's.
    · Share on FacebookShare on Twitter
  • westmassguy
    westmassguy Posts: 6,850
    pitdogg2 wrote: »
    invalid wrote: »
    The 2A's are not bright after you change the tweeters, plus you can use RD0198 with the added cap just like the 2b.

    No inductor change to use the 5.8 cap? I thought you had to.

    I was aware of the possibility only after I had finished and already spent a ton on two set of speakers.

    Compare the schematics for the high-pass on both Ivan. The only difference is an additional padding resistor in series with the 0.4uf 2nd order shunt bobbin inductor on the 2B. Otherwise they're identical. I've done the tl modification on dozens of 2As and 1986 CRS=s, including my own.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
    · Share on FacebookShare on Twitter
  • pitdogg2
    pitdogg2 Posts: 25,412
    westmassguy wrote: »
    pitdogg2 wrote: »
    invalid wrote: »
    The 2A's are not bright after you change the tweeters, plus you can use RD0198 with the added cap just like the 2b.

    No inductor change to use the 5.8 cap? I thought you had to.

    I was aware of the possibility only after I had finished and already spent a ton on two set of speakers.

    Compare the schematics for the high-pass on both Ivan. The only difference is an additional padding resistor in series with the 0.4uf 2nd order shunt bobbin inductor on the 2B. Otherwise they're identical. I've done the tl modification on dozens of 2As and 1986 CRS=s, including my own.

    I did after @invalid made mention, either way you had done yours years after I did mine. They were long gone from my home at that point. The member who ended up with them has moved on as well. I need to get over to Indy and pick up the mw6510's to keep as spares for the 2.3tl's 😉
    · Share on FacebookShare on Twitter