Do all drivers work when no IC is present?

halo71
halo71 Posts: 4,636
in Vintage Speakers
I have 1B's. I am gonna make a cable tomorrow, or try to anyways. But am wondering now if all the drivers work on this model if there is not a cable connected between the speakers.
--Gary--
Onkyo Integra M504, Bottlehead Foreplay III, Denon SACD, Thiel CS2.3, NHT VT-2, VT-3 and Evolution T6, Infinity RSIIIa, SDA1C and a few dozen other speakers around the house I change in and out.
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  • halo71
    halo71 Posts: 4,636
    Coulda swore I can hear both tweeters working.
    --Gary--
    Onkyo Integra M504, Bottlehead Foreplay III, Denon SACD, Thiel CS2.3, NHT VT-2, VT-3 and Evolution T6, Infinity RSIIIa, SDA1C and a few dozen other speakers around the house I change in and out.
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  • Schurkey
    Schurkey Posts: 2,122
    edited January 2015
    ZLTFUL wrote: »
    Nope. The dimensional drivers only work when there is an IC connected.
    The 1B is new enough that ALL the drivers work when the SDA interconnect cable is disconnected. True also for 1C, 2A, 2B, later CRS, and all of the SRS series. The 1B--and I presume the others of that and newer generations as well--sounds quite pleasing and natural without the SDA cable; using it allows the expanded soundstage but little toneality change.

    The SDA drivers provide bass reinforcement for the stereo drivers with no IC cable attached. Polk had a fancy name for this, "something-or-other sub-bass something something". I'm too lazy to look it up. Add the IC cable, and the SDA drivers do double-duty--the SDA signal as well as bass reinforcement.

    NOT true for the SDA1, SDA 1A, SDA 2, and (maybe) the earliest CRS, (am I correct--any model with an SDA tweeter) where disconnecting the SDA interconnect disables the SDA driver(s).
    halo71 wrote: »
    Coulda swore I can hear both tweeters working.
    Yup. The 1B doesn't use an SDA tweeter like the prior generations. The 1B uses a two-tweeter progressive-point-source stereo tweeter pair per cabinet. Tweeter is completely un-affected by SDA cable use or non-use in ordinary listening. (It is possible to connect the speakers improperly and have a back-feed through the tweeters from the SDA signal, but this isn't important if the speakers are wired properly.)
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  • halo71
    halo71 Posts: 4,636
    Thanks guys!
    --Gary--
    Onkyo Integra M504, Bottlehead Foreplay III, Denon SACD, Thiel CS2.3, NHT VT-2, VT-3 and Evolution T6, Infinity RSIIIa, SDA1C and a few dozen other speakers around the house I change in and out.
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  • westmassguy
    westmassguy Posts: 6,850
    Schurkey wrote: »
    Polk had a fancy name for this, "something-or-other sub-bass something something". I'm too lazy to look it up.
    "Full Compliment Sub-Bass Drive" (Circuit)
    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/
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