sda srs 2.3 polyswitch removal

I have the sda 2.3 speakers, serial# - SRS 2.3 L 3955, they have always sounded muffled with no treble - am wanting to remove the polyswitches as some members have suggested. I am trying to identify them correctly - is a schematic available for the crossover or is a part number available. Pictures would be great - I'll take anything! Already modded the crossovers with new audio film capacitors - made no difference to the sound. Wanting to try this first before replacing all the tweeters.