Polk SDA-CRS+ vs SDA-2B comparison --> winner is CRS+
Both have silver dome SL2000 tweeters.
I haven't opened them up so no idea what mid drivers they have.
CRS+ is pin/blade so from specifications of 1987, it should have Stereo Driver MW6503 and SDA Driver MW6511.
2B's are blade/blade so from specifications of b/b version of 1987, they should have the same MW6503 and MW6511.
That's a perfect match except PR and cabinet.
If CRS+ is from 1989, stereo driver is MW6510 with everything else same but that driver will have different mid range.
Even crossover looks same.
Amp: Pioneer SA-1040 (100wpc integrated non-switching amp).
Source: FM, Laptop, CD player.
CRS+'s are on top of 2B's.
Distance: 6 feet between speakers and 7 feet to listening position.
CRS+'s are louder at same volume than 2B's.
More musical, highs/mid have very slight metallic/nasal tone compared to 12B's but much better than 2B's.
CRS+ sound open/free/joyful and fuller overall than 2B's but still have little bit hollowness compared to 12B's.
Nasal vocalists are not that off. They do have metallic tone but still sound natural.
They don't sound dry/thin like 2B's but do have slight metallic tone probably due to SL2000 compared to 12B's SL2500.
Both SDA's have that hall/echo like enveloping sound compared to non-sda 12B's.
If 12B's are out of the picture, CRS+'s sound open/free compared to 2B's that sound slightly thin/dry.
No complain on lows. CRS+ are so tiny compared to 2B's but bass is amazing with that soft sub like thump.
2B's have deeper/more low bass but it's exact same bass sound on CRS+ as well, me likey. :)
However, SDA effect is amazingly better/more in CRS+'s than 2B's.
I played many tracks that have SDA effect, put some sections of song in loop to listen SDA effect on both.
SDA effect in CRS+ are more prounounced, farther to sides and back, wider, higher, overall more enveloping sound all around than 2B's.
For example, in few songs that have sound in left side to the ceiling in 2B's, that sound is in the left back side to the ceiling instead of just to side.
Similarly, right sound few feet wider in 2B's sound like they are way farther to right side in CRS+.
In some stereo sweep sound, 2B's sound they come up to my listening position and go to other side while CRS+ come all the way to back of my couch and go to other side.
Music is floating everywhere in CRS+'s.
You already have read 2B's vs 12B's but the difference here is that 2B's don't sound that different from CRS+ except that CRS+ don't have that much thinner/hollow sound.
Also, 2B's sound slightly recessed/veiled and constrained as if the singers are not singing to their fullest compared to CRS+'s.
Slightly dry and thin compared to CRS+ but they do have more/low/deeper bass.
Overall slightly darker/sad and cleaner sound than CRS+. (same will go from 12B's to CRS+'s)
Bass is one volume level up in 2B's than CRS+'s.
I think that more bass is changing the sound in 2B's by overwhelming mid range as CRS+'s have similar mid driver with less bass that brings more mid resulting to fuller sound.
Listening to CRS+ doesn't feel like it's missing much. Ears don't struggle to find all music in a song.
2B's sometimes needs focussed ears to listen to some mid range sound.
When switching from 12B's to CRS+'s it's not a drastic change like switching from 12B's to 2B's.
12B's still have more mid resulting in more open, fuller sound and CRS+ sound slightly veiled/darker but not that much.
After first few minutes of switching from 12B's, CRS+'s start to sound very nice that I forget a need to switch to 12B's.
However, after first few minutes of switching from 12B's to 2B's, 2B's do start to sound better but still not as good as CRS+ and I change back to 12B's or CRS+'s.
2B's have big hole in mid range same as 10A's that CRS+'s almost don't have or very little if they have.
So to conclude, between CRS+'s and 2B's, CRS+'s are clear winner over 2B's.
2B's have deeper/better bass but everything else goes to CRS+'s.
All time hippop/rap listeners may prefer 2B's due to deeper bass.
I'm not deciding between 12B's and CRS+ yet as I'll be keeping both and I like both.
Those who have had both CRS+' and 2B's, chime in.
I read a thread (I forgot Tennman, Polkieman or Tophatjohny) where going from CRS+ to 2B was huge improvement and going from 2B to 1C was another improvement but for me, CRS+'s are improvement over 2B's unless of course bass is the only preference.
Test setup below: Both SDA's are few inches in front of everything.