The only difference I saw was the frequency response between the 25, 30, and 35. I have no clue what that means in terms of overall listening quality. Other than that it looks like the cabinet size is the only difference.
If I can't explain the difference in the 25,30, and 35 to you with my simple response in post #2, how can I explain anything else?
Height. 25 is 25"H, 30 is 30"H, and 35 is 35"H
Style: On-wall Speaker
Power Handling: 50-200 watts
Woofer: Dual 5.25" Carbon Fiber
Tweeter: 1" Silk/Poly Dome
Sensitivity: 86 dB
Frequency Response:
48 Hz - 20 kHz
Impedance: 6 Ohms
Dimensions:
25" H x 7 1/8" W x 5 5/8" D
Weight: 16.5 lbs
Style: On-wall Speaker
Power Handling: 50-200 watts
Woofer: Dual 5.25" Carbon Fiber
Tweeter: 1" Silk/Poly Dome
Sensitivity: 86 dB
Frequency Response:
48 Hz - 20 kHz
Impedance: 6 Ohms
Dimensions:
30" H x 7 1/8" W x 5 5/8" D
Weight: 19.5 lbs
Style: On-wall Speaker
Power Handling: 50-200 watts
Woofer: Dual 5.25" Carbon Fiber
Tweeter: 1" Silk/Poly Dome
Sensitivity: 86 dB
Frequency Response:
48 Hz - 20 kHz
Impedance: 6 Ohms
Dimensions:
35" H x 7 1/8" W x 5 5/8" D
Weight: 27 lbs
While all three models list the same FR, I would imagine each larger enclosure would have a slightly lower FR.