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Pic #1 This is the Polk SDA 1C Crossover Network Before I Modified Them. They Looked Better Before I Touched Them But Boy They Sound a Lot Better Now!

Pic #2 Side View of Modified Xover. The Large Black Capacitors (Caps) are Solen. The Small White Caps With Copper Ends are Infini Caps Used as a Bypass Set-up. On the Right Side You Can See a White MIT Cap With Black Ends. You Can Also See Polk Uses Large Air Coils in This Xover

Pic #3 Top View of Modified Xover. You Can See I potted Them In Silicone Because the Caps are Large and Heavy. They Don't Move at All Anymore

Pic #4 Another View of the Modified Xover

Pic #5 Spikes and Plate Mounted to bottom of Polk SDA-1C Speakers. This really improved the low end.

Pic #1 Homemade AI1 Isolation Transformer for Polks SDA Speakers When Using Common Ground Amps. Several different Isolation transformers that will do the job can be ordered from the Newark Company (1-800-463-9275) the following parts can be used: SPC Technology part number # 81N5406 isolation transformer (2" x 3 1/4" x 1 3/4") $15.99 each Stancor Transformer part number #01F043 (2" x 3.25" x 1.8") $20.04 each Magnetek Triad part number # 03F1017 $16.46

Pic #2 AI1 Cord, Military Connectors Replaced Standard Cord Connections and New Binding Posts

Pic #3 Back Side of Connectors all Solidered