What's the differs btween these and the tl2s

We'll, some differences are that the tl1's are smaller, in dimension, and use smaller drivers, and possibly offer a different materials make-up in regards to the mid-range drivers. The tl1 tweeter(high frequency driver) is 1/4in smaller, 1/2in compared with the 3/4in tweeter of the tl2 speaker. The mid-range driver of the tl1 is in the 2 1/2in size class, and is listed as aerated polypropylene, and I believe it is a product of their laser imaging research, like their LSI, a past reference series, and the tl3. These aerated polypropylene drivers are positioned below the super cell aerated polypropylene drivers in their current "reference" LSIM series offerings. The tl2's woofer(mid-range driver) offering is a 3 1/4in in size class, and the material composition however is listed only as an injection moulded composite, and I suspect and might be the "lower-end" regular polypropylene of older technology, or the newer "higher-end" aerated polypropylene(like tl1 & tl3). I doubt it would use super cell, and still be positioned below the tl3.. My bets on regular polypropylene, this could support a pricing mode difference in the tl line-up, between the tl2 and tl3 offerings.. I think the tl2 speaker supports a larger frequency range than the tl1 speakers, as well, this doesn't denote "higher-fidelity" however, within all frequencies. I would likely think with the tl1, you might crossover your sub-woofer higher, because I'm guessing the tl1 system would be more sub-woofer dependant, for lower frequencies. This tl1 product might place higher demands on a "sub-woofer" solution. The tl1's likely also make higher demands of an amp, in order to produce the lower frequency range, as larger drives, afaik, in comparison, are typically more efficient for reaching lower frequencies, and the tl2 offers larger drivers. This might affect performance, especially at higher volumes. Conversely, the higher frequency driver damping might be easier with the tl1's, and perhaps they might be more effective there. IMO, I've read subjective accounts of the tl1's sounding "better than" or "the same" as tl2's, and vice versa.

My living room is 23'x25' do you think they would sound good with 4 of them on the walls, with the matching center speaker and 2 subwoofers ?

I have a almost identical size room. I replaced my older Optimus wall speakers and center speaker with 4 of these Polk Blackstone TL1 speakers, a TL1 Polk center speaker and used my existing Polk PSW-10 subwoofer, and the sound improvement was PHENOMAL!!! I am not sure that you would need 2 subwoofers. I highly recommend these speakers. They are small but very powerful

Is Electric	No
Power Source	Corded Electric
Speaker Maximum Output Power	50 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Protocol	Bluetooth
Connectivity Technology	Optical
Audio Driver Type	Dynamic Driver
Item Weight	0.84 Kilograms
Item Dimensions D x W x H	3.8"D x 4.9"W x 6.5"H
Unit Count	1.0 Ounce
Impedance	8 Ohm
Number of Audio Channels	1.0
Frequency Response	22 KHz
Compatible Devices	Projector, MP3 Player, Laptop, Television, Desktop, Tablet, Smartphone
Speaker Size	0.5 Inches
Tweeter Diameter	1.27 Centimeters
Water Resistance Level	Not Water Resistant
MP3 player	No
Specific Uses For Product	home theaters
Controller Type	Corded electric
Color	Black
Is Waterproof	False
Warranty Type	Limited
Control Method	Remote
Audio Output Mode	Surround
Mounting Type	On A,Wall Mount
Speaker Type	Satellite
Additional Features	Hi Res Audio
Recommended Uses For Product	Home Theater
Subwoofer Diameter	2.5 Inches

Polk Audio Blackstone TL1 Satellite Speaker (Single, Black) | PowerPort Technology, Hi-Gloss Finish | Compact Sound | Pair with TL Series for Complete Home Entertainment | Surround Sound Speaker

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