This one kinda looks like Polk RTA-12's...

Has anyone heard these?
Peerless tweeter on the top just like RTA-12's.
Design Acoustics D-2.

00i0i_jsmmT3hvssG_0CI0pK_600x450.jpg

00d0d_6c8czhZZ8E1_0CI0pK_600x450.jpg

00M0M_2Bcbi78N3KZ_0CI0pK_600x450.jpg

Sonus Faber Concerto Grand Piano, Klipsch, B&W DM602.5, Epicure 20+, T/E 280, 100V, Polk.
Subwoofers: Monitor Audio, B&W ASW300, Triad ProSub Bronze.

Comments

  • boston1450
    boston1450 Posts: 6,874
    edited January 18
    Strange how the tweets aim at the moon.
    Randy/Maine ..RTA15TL-Cs1000p
  • Mystery
    Mystery Posts: 2,543
    edited January 18
    boston1450 wrote: »
    Strange how the tweets aim at the moon.

    Looks like that was done to flatten the tweeter response curve.
    The Peerless dome tweeter was set at an angle as frequency response graphs showed that the 45 degree off axis response curves were the flattest and smoothest. Those tweeters can be a bit "sizzly" directly on axis, which you can hear if you stand in front of the speaker.

    Sonus Faber Concerto Grand Piano, Klipsch, B&W DM602.5, Epicure 20+, T/E 280, 100V, Polk.
    Subwoofers: Monitor Audio, B&W ASW300, Triad ProSub Bronze.
  • aprazer402
    aprazer402 Posts: 2,427
    edited January 19
    I'm familiar with, but have not personally owned Design Acoustic's D-12 dodecahedron and the D-6. Their D-2, D-3 and D-4a models are fairly rare. I had to look up the size on these D-2's; $150.00 MSRP, 34" high, 12.25" square, 35 lbs. The tweeter is 30 degrees to vertical. The rocker switch next to the tweeter reduces the tweeter output by 3db for overly bright rooms. 10" woofer. The reviews were good.
  • Mystery
    Mystery Posts: 2,543
    aprazer402 wrote: »
    ... these D-2's; $150.00 MSRP, 34" high, 12.25" square, 35 lbs. The tweeter is 30 degrees to vertical...

    That is pretty cheap msrp for floor standing speakers.
    Polk 5jr bookshelf speakers are more.

    Sonus Faber Concerto Grand Piano, Klipsch, B&W DM602.5, Epicure 20+, T/E 280, 100V, Polk.
    Subwoofers: Monitor Audio, B&W ASW300, Triad ProSub Bronze.
  • Gardenstater
    Gardenstater Posts: 2,014
    That's very odd and interesting. I'd like to do a search for reviews and will. The Peerless data sheet doesn't show off axis response to be flatter however:

    ric05lfmgdo7.png
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
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    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • skrol
    skrol Posts: 3,096
    So the old Monitor stands had about a 6 deg tilt. I believe this was done for for time alignment. If they were ear level, that tilt might tame them a little. However, since they were well below the ear the tilt would tend to aim them up at the ear and be more on-axis. ... just thinking out loud.
    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
  • Gardenstater
    Gardenstater Posts: 2,014
    edited January 20
    Stereo Review, July 1976, p. 42

    https://worldradiohistory.com/Archive-All-Audio/Archive-HiFI-Stereo/70s/HiFi-Stereo-Review-1976-07.pdf

    It explains the tweeter angle better. Horizontal dispersion; everywhere in the horizontal plane, is more uniform when tweeter is tilted up by 60deg.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • audioluvr
    audioluvr Posts: 3,706
    That's very odd and interesting. I'd like to do a search for reviews and will. The Peerless data sheet doesn't show off axis response to be flatter however:

    ric05lfmgdo7.png

    Those specs were taken while mounted on a vertical surface. Could be totally different different horizontally.
    Clearly they were not a big seller even at the bargain basement MSRP.
    Cambridge Audio 851N Streamer/DAC
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    Wireworld Silver Eclipse IC's and speaker cables


    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January.

    by Dr. Sardonicus
  • Gardenstater
    Gardenstater Posts: 2,014
    edited January 20
    audioluvr wrote: »

    Those specs were taken horizontally while the tweeter was mounted on a vertical surface. Could be totally different different horizontally when the tweeter is tipped back by 60deg.

    Clearly they were not a big seller even at the bargain basement MSRP.

    Forgive me for the edit. I thought it was clearer this way. :)

    Not that expensive for sure but I think the price was $150 per speaker. I paid $175 ea. for my 7B's.

    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform