What is this flap thing?

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TCK
TCK Posts: 231
in Vintage Speakers
68ajuh0ncepg.jpg

What is the purpose of this flap above the tweeter? This is from a pair of 3.1s. I have seen it before, not sure what it does, if anything. I just want to cut it off or tuck it in or something.
- SDA 2B (1989, Oak Tops, 194s, Spikes)
- Monitor 7B (1982 Peerless, Sonicaps, Mills, Dynamated, JB Welded, Binding Posts)
- SVS SB12-NSD (2 in Flat Black)
- SVS SB 3000 (Gloss Black)
- Pioneer SC-1222K AVR
- Marantz MM 7055 (5 Ch Amp)
- Pioneer PD-D6 SACD Player
- Marantz NR1403 AVR
- Sony UBP-X800M2 (4k Blu-ray)
- Sony UBP-X1100ES (4K Blu-ray)
- Adcom GFA 555
- Monitor 5 (194s, Side Surrounds)
- Monitor 5Jr+ (194s)
- LG OLED65CXPUA (4K OLED TV)
- LG 55UN7300PUF (4K HD TV)
- RT35i (Cherry)
- CS400 (Center)
- CS350 (Center)
- F/Xi A4 (Rear Surrounds)
- RT25 (Rear Surrounds)
- Audioquest Cables



" But boy do I remember the strain of her refrain " LG
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  • Nightfall
    Nightfall Posts: 10,067
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    Diffraction?
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
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  • lawdogg
    lawdogg Posts: 450
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    Take it off and see if you hear anything different. I'm curious.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • ken brydson
    ken brydson Posts: 8,649
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    Don't ask Russ about the flap thing....
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  • skrol
    skrol Posts: 3,338
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    From the sales literature... "And to eliminate any possibility of phase anomalies and other coloration, Polk developed a unique diffraction spoiler which dramatically improves audible frequency response and imaging. By controlling diffraction, smearing of the sonic image and peaky characteristics are eliminated."

    Basically, it keeps the upper mid-woofer from interfering with the dispersion of the tweeter.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.

    HT:
    Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • F1nut
    F1nut Posts: 49,795
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    Do NOT remove it.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • TCK
    TCK Posts: 231
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    Thanks all. They are not mine. I was just wondering. Did they do that with other models?
    - SDA 2B (1989, Oak Tops, 194s, Spikes)
    - Monitor 7B (1982 Peerless, Sonicaps, Mills, Dynamated, JB Welded, Binding Posts)
    - SVS SB12-NSD (2 in Flat Black)
    - SVS SB 3000 (Gloss Black)
    - Pioneer SC-1222K AVR
    - Marantz MM 7055 (5 Ch Amp)
    - Pioneer PD-D6 SACD Player
    - Marantz NR1403 AVR
    - Sony UBP-X800M2 (4k Blu-ray)
    - Sony UBP-X1100ES (4K Blu-ray)
    - Adcom GFA 555
    - Monitor 5 (194s, Side Surrounds)
    - Monitor 5Jr+ (194s)
    - LG OLED65CXPUA (4K OLED TV)
    - LG 55UN7300PUF (4K HD TV)
    - RT35i (Cherry)
    - CS400 (Center)
    - CS350 (Center)
    - F/Xi A4 (Rear Surrounds)
    - RT25 (Rear Surrounds)
    - Audioquest Cables



    " But boy do I remember the strain of her refrain " LG
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  • smglbrth
    smglbrth Posts: 1,460
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    RTA 15tl,11tl, 8tl are the only ones I can think of off-hand...
    Remember, when you're running from something, you're running to something...-me
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  • honestaquarian
    honestaquarian Posts: 3,186
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    F1nut wrote: »
    Do NOT remove it.

    Yeah
    What HE said!!
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  • Nightfall
    Nightfall Posts: 10,067
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    RTA-12B and C have two diffraction plates. One in the top hat and one in the tweeter mount.
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
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  • tonyb
    tonyb Posts: 32,906
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    I ask myself that same question when I get out of the shower. Wife gives me the same advice.....Don't remove it !!
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • lawdogg
    lawdogg Posts: 450
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    Has anyone ever removed one to listen for the difference? For science?
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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