I moved my "new" stock SDA SRS2's out and replaced them with the SDA2a's with rebuilt x-overs and here is what I thought I would share with you. A few days ago I finished upgrading a few caps and resistors in my SDA2a's. I decided to do the lower x-over only to hear what the difference will be. I upgraded to Solen 20uF, Solen 12uF and 2.7 Mills resistors for about $50.00 total. It is amazing to hear the difference, simply amazing!! The RDO-194's have been broken-in over the past six months so they already sound great.
The 2a's do not sound as good as the SRS2's but with the upgraded caps and resistors I can hear "things" I did'nt hear as well with the stock SRS2's.
If you have the entry level SDA's you must spend alittle time and money and at least re-do the lower x-over. You will go from having a pair of speakers that may cost $250.00 plus $50.00 and have a world class sound. If you feel you can't handle the re-build yourself make no mistake you have all of us to assist you. The Club Polk Members are the best.
I just ordered caps and resistors from Sonic Craft to do the x-overs for my SRS2's and can't wait for them to be delivered.
Thanks to all the members who take the time to put excellent post/threads together. Without you I may be listening to Bose 901's
Drew R. Crawford