![Comparison of Polk SDA CRS+ with Boston Acoustics A400 -- Bass= SDA; Mids/highs=A400. — Polk Audio Forum Comparison of Polk SDA CRS+ with Boston Acoustics A400 -- Bass= SDA; Mids/highs=A400. — Polk Audio Forum](https://us.v-cdn.net/5021930/uploads/attachments/1/7/0/6/5/5/73454.jpg)
Comparison of Polk SDA CRS+ with Boston Acoustics A400 -- Bass= SDA; Mids/highs=A400. — Polk Audio Forum
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Amazon.com: Boston Acoustics 6.5" Speaker Foam Surround Edge Repair Kit - 2 Speaker Kit - Compatible with Boston Acoustics A400, A-40, A-40 Series II, 360, 360 Series II, 362, CR7, HD-9, HD9, HD 9, Many More : Electronics
![Amazon.com: Boston Acoustics 6.5" Speaker Foam Surround Edge Repair Kit - 2 Speaker Kit - Compatible with Boston Acoustics A400, A-40, A-40 Series II, 360, 360 Series II, 362, CR7, HD-9, HD9, HD 9, Many More : Electronics Amazon.com: Boston Acoustics 6.5" Speaker Foam Surround Edge Repair Kit - 2 Speaker Kit - Compatible with Boston Acoustics A400, A-40, A-40 Series II, 360, 360 Series II, 362, CR7, HD-9, HD9, HD 9, Many More : Electronics](https://m.media-amazon.com/images/I/611zqICAj0L._AC_UF894,1000_QL80_.jpg)