Has anyone modified SDA-2Bs to SDA-1Cs?

gary_haskins
gary_haskins Posts: 6
in Vintage Speakers
I'm thinking of adding two more bass drivers (one SDA one Regular)and an SDA tweeter after the upgrade. I'll modify the mounting board by placing the tweeters side by side and cutting new holes for the woofers. Any thoughts?
· Share on FacebookShare on Twitter

Best Answers

  • FestYboy
    FestYboy Posts: 3,861
    Answer ✓
    Won't be the same, enclosure volume is different, therefore throwing the tuning off.
    · Share on FacebookShare on Twitter
  • Gerres26
    Gerres26 Posts: 862
    Answer ✓
    I would just buy a set of 1c's if thats what you want. You can always sell the 2b's to recoup most of the cash and you won't have to worry about ruining a perfectly good set of speakers in the process.
    · Share on FacebookShare on Twitter
  • Rrusse11
    Rrusse11 Posts: 116
    Answer ✓
    https://baltimore.craigslist.org/bik/d/polk-audio-sda-1c/6455604735.html

    Here's the option.
    SDA SRS 2.3s
    Pair of Carver TFM 35s
    Carver C-1 Preamp
    CAL Icon MkII CD
    RTA 12s, need major work
    · Share on FacebookShare on Twitter
  • pitdogg2
    pitdogg2 Posts: 24,548
    Answer ✓
    gary_haskins wrote: »
    I'm thinking of adding two more bass drivers (one SDA one Regular)and an SDA tweeter after the upgrade. I'll modify the mounting board by placing the tweeters side by side and cutting new holes for the woofers. Any thoughts?

    That's just silly talk!
    Cabinet is not large enough
    Crossover is not right.
    Cheaper to just buy a different set of speakers.
    Many think a fully modded sda2b set runs circles around the 1c
    The sda2b can be TL'd
    · Share on FacebookShare on Twitter
  • tonyb
    tonyb Posts: 32,906
    Answer ✓
    All good points ^^^^^^^^

    Plus....more drivers doesn't necessarily equate to better sound.
    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
    · Share on FacebookShare on Twitter
  • gmcman
    gmcman Posts: 1,752
    Answer ✓
    What size room do you have your 2B's in? Just curious on your setup, I had mine in a 13x28 room and they sounded great.

    I agree trying to modify your 2B's will result in a ruined speaker.
    · Share on FacebookShare on Twitter
  • verb
    verb Posts: 10,176
    Answer ✓
    gary_haskins wrote: »
    I'm thinking of adding two more bass drivers (one SDA one Regular)and an SDA tweeter after the upgrade. I'll modify the mounting board by placing the tweeters side by side and cutting new holes for the woofers. Any thoughts?

    These Polkies can be a bit rough @gary_haskins ! Don't fret :smile: I own a set of 2B's, and recently acquired a set of 1C's that I'm completely modding. See my thread:

    I bought them for 3 hundie. Lot's of fun with the mods!

    http://forum.polkaudio.com/discussion/179960/another-1c-upgrade-path/p1

    BTW - Welcome to CP!
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 49,781
    Answer ✓
    Good to hear.

    Do the TL upgrade along with the host of standard upgrades including the Dreadnought. Your jaw will hit the floor.
    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

    · Share on FacebookShare on Twitter
  • headrott
    headrott Posts: 5,484
    Answer ✓
    @gary-haskins, I own a pair of 2B(TL'd) SDA's, a pair of 3.1TL's and a pair of 2.3TL's. If you are looking for more sound output, the best upgrade you can do is get some 2.3TL's. They are as 2B(TL's) on steroids.
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
    · Share on FacebookShare on Twitter

Answers