I have a pair of 2.3TLs that I have had for many years. They rarely get any use because they are in the downstairs family room. I decided to fire them up the other day and thought they sounded like crap. Specifically there was very little high end. I pulled to the front covers and realized that the #1 tweeters in both speakers were fried. The overall sound was somewhat muddy, with very little clarity. So, I began an internet search for replacement tweeters and stumbled upon this site. I ordered a pair of 198s from Polk (I realize it might not be ideal to mix 198s with the 3000s). I then started reading this forum to educate myself on these speakers. Now I am thinking about the crossover upgrade, so today I pulled my crossovers and discovered some interesting things
First, it seems like Polk deviated quite a bit from the schematic with the cap values. The 16uF cap in the schematic is replaced by a 4.4uF and 4.2uF run in parallel on both of my crossovers. Same situation with the 16uF and 18uF caps. both have dual caps run in parallel that do not add up to the stated values in the schematics. does anyone have any insight on this?
Also there are two 750pF caps run in parallel with both the 8uF and 16uF caps. on one of my boards, one of these 750pF caps is missing. If you look closely, you can see that one lead of the 8uF cap is connected to the far side of the R2 location on the board. If you flip over the board and look at the tracings, it appears that this configuration is incorrect. In order for the 750pF cap to be in parallel with the 8uF cap, the 8uF cap should be connected to the near side of the R2 position on the board. Does this make sense or am I missing something?
I noticed that the Gimpod upgrade does not include the 750pF caps.
At any rate, I am looking forward to making the upgrade, and would not have even been aware of it if not for stumbling on this great forum.