Sda 2b transplantation into sda-crs+ boxes
JonathanPeterson
Posts: 103
I have space issues and can't have giant speakers at the moment
I currently own crs+ bookshelves.
Picked up sda-2b on curb side . Were about to be thrown away during trash day.
Veneer looks new. Cabinets are great.
But I would like to build smaller boxes like sda crs+ maybe a little wider to accommodate 10" passive radiator.
From gimpod site looks like sda-crs+ and sda 2b are identical except for box size and passive radiator
I really don't need low end from these. Have 15" sub.
So
1) put drivers and tweeters into smaller box
2) replace mw6510 with mw6503(available from Polk directly)
3) recap crossovers and add that capacitor in parallel with that resistor to accommodate rdo-198 tweeter
What are Polk community thoughts on this
I appreciate and God bless usa
I currently own crs+ bookshelves.
Picked up sda-2b on curb side . Were about to be thrown away during trash day.
Veneer looks new. Cabinets are great.
But I would like to build smaller boxes like sda crs+ maybe a little wider to accommodate 10" passive radiator.
From gimpod site looks like sda-crs+ and sda 2b are identical except for box size and passive radiator
I really don't need low end from these. Have 15" sub.
So
1) put drivers and tweeters into smaller box
2) replace mw6510 with mw6503(available from Polk directly)
3) recap crossovers and add that capacitor in parallel with that resistor to accommodate rdo-198 tweeter
What are Polk community thoughts on this
I appreciate and God bless usa
Comments
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A couple folks here, including myself have converted M10's to SDA using CRS+ crossovers. I experimented on a 10B set and either the MW6502 or MW6511 needs to be in the SDA MW driver location since they are 4ohm nominal. The 6502's have better midrange, but the 6511's have better throw, thus better bottom-end frequency.
Search for member TennMan's post about his conversion. It's a simple affair.Don't take experimental gene therapies from known eugenicists. -
Are your CRS+ on stands now?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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Sda-crs+ are on on two drawer cabinets
Ok, so taking up at least as much floor space as the better SDA 2B, yet you're wanting to make cabinets larger/wider than the CRS+!?! You also want to screw around with swapping drivers, crossover components and something about putting one SDA on top of another???
STOP the madness. Give the speakers to someone that isn't going to ruin them.
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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MW6502 or mw6511 are both 4 ohm and either can go in SDA driver spot for CRS+ crossovers.
MW6503 or mw6510 are 8 ohms nominal and work in the stereo circuit of CRS+ crossovers. Like you said, I found the 6502's tighter and better midrange production than the 6511's.
F1 means well, cause he's seen a lot of snowflakes smoke their equipment. He cares a lot.
Don't take experimental gene therapies from known eugenicists. -
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JonathanPeterson wrote: »That's a conservative approach. I have yet to find someone who is better in carpentry and manual dexterity than I.
I like versatility of small speakers. U can put them anywhere. In NYC space is an issue.
How are sda-2b better?
I am not the guy who goes to the shop with lost eyeballs to get "serviced".
Need to back up your statements with some scientific evidence. I want more pronounced mid-range. Classical music , strings, guitar will definitely benefit from wider surface area of the sound source. Larger box makes more bass at the expense of mid-range clarity. If I am mistaken show me good evidence. I had 2 pairs of sda-crs+ stacked at some point. Good results. More volume and texture in piano, guitar. More impactful sound
Scientific evidence!?!......LOL
I'll tell you what, I'll give you the best there is, my ears. I owned both the CRS+ (with proper stands) and 2B. Both were fully modified including the TL mod. Hands down the 2BTL is better at balance, dynamics, presence, clarity, impact, tactical sensation, scale and ease of placement. I sold the CRS+ (4.1TL) and still have the 2BTL.
You may find this interesting. At first I modified the CRS+ and used the RD0194 tweeters. I didn't like the sound, so I did the TL mod and used the RD0198 tweeter, which resulted in a better presentation. Still not as good as the 2BTL though.
Just because two Polk MWxxxx drivers have the same ohm rating doesn't mean they are interchangeable. There are other extremely important specs.
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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TS parameters affecting low end response doesn't seem to be on his radar. Unfortunately as time wanes, and Polk no longer makes the various drivers, the swap meet here will become a thing.Don't take experimental gene therapies from known eugenicists.
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JonathanPeterson wrote: »Well I'll give them a spin as is. Woofers inside don't have any stickers on them..hard to say if I have 2b with 6503 or 6510.
Crossover will tell you which sda 2 a or b you have. That there is not rocket science or are you referring to drivers? -
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Use your technical skills instead of your carpentry skills to evaluate the speakers."Sometimes you have to look to the past to understand where you are going in the future"
Harry / Marietta GA -
How would he know difference between 6503 vs 6510 if only being able to ohm them out?Don't take experimental gene therapies from known eugenicists.
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JonathanPeterson wrote: »Thanks for that suggestion. I am sure You sharp wit and sarcasm was highly appreciated here.will definitely use basic skills of electrician as opposed to dump truck drivers skills to try to figure out the drivers
Hey @JonathanPeterson welcome to CP! I do admire your desire to jump in and start making things happen. I do know that there is a lot of good advice here, and a lot of folks have traveled down the road before.
Congrats on the 2B's ! Wow what a find. I had a set of 2B's, of which I gave to a buddy, currently own a set of CRS's, and even though not modded, the 2B's IMO are a better foundation to begin your modification journey.
As a corollary, I was thinking a while ago to mod my 1st gen SRS's to a TL version, in order to run monoblocks, thinking it was just a matter of upgrading the electronics. But after chatting and receiving advice from members here, learned that it was more than just electronics and the drivers. The cabinets themselves are completely different on the inside. Sure you could do it, but the results? Probably not what I would have expected.
So I stood down on that project, and am keeping an eye out for the TL's!
Regardless, have fun! Glad you're here!
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. -
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Well, no.
The CRS+ has an efficiency rating of 89.5dB.
The 2B has an efficiency rating of 89.7dB.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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I had found that after upgrading the XO in one of my RTA-11TL's it sounded louder than the unmodified even though they were the same part values. I think it was all perception. I should have used an SPL meter to verify.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 -
Good luck!
