Improvements To The SDA SRS 1.2TL - Summary Of Modifications

wrich22a wrote: »

The links that are referenced above by DarqueKnight do not work,

Unfortunately, the transition to the new forum format destroyed the old links. Copying and pasting the link titles into Google usually takes you to the thread, although sometimes you might not end up on the first page of the thread.

wrich22a wrote: »

I haven't been on this forum for about 6 years and I am trying to play catch up. I have a pair of SDA-SRS's that I bought on E-bay 9 years ago which I modified with new tweeters, capacitors, resistors etc. Based on what I learned form Ray.

Welcome back. I documented my last SDA SRS crossover mod in these this thread:

http://forum.polkaudio.com/discussion/111239/further-improvements-to-the-sda-srs-custom-pcb-and-sda-inductor

wrich22a wrote: »

Can I assume the .4mh and .7mh inductors that are in the chart will work part number 1160 and 1489?

I discuss inductor upgrades near the end of the thread quoted above:

DarqueKnight wrote:

The 0.4 mH 22 AWG and 0.7 mH 25 AWG inductors in the high frequency section and the 2.75 mH 18 AWG inductors in the low frequency section of my SDA SRS's were replaced with Jantzen perfect lay inductors. Jantzen only had a direct replacement for the 0.4 mH 22 AWG inductor. The 0.7 mH 25 AWG inductor was replaced with a 0.75 mH 26 AWG inductor that was unwound to 0.7 mH. The 2.75 mH 18 AWG inductor was replaced with a 3 mH 18 AWG inductor that was unwound to 2.78 mH.

The Jantzen inductors were special ordered from Parts Express. Parts numbers and prices are:

0.40 mH 22 AWG, part number 1489, $2.94 each.
0.75 mH 26 AWG, part number 1160, $1.89 each.
3.00 mH 18 AWG, part number 1068, $14.09 each.

The standard delivery time for Jantzen special orders (from Denmark) is eight weeks. This order arrived in two weeks-four days.

wrich22a wrote: »

Does anyone know about the 2.75mh inductor? I found a Jantzen listing which has a part number 000-0049, which 2.75mh, .9ohm, Awg 18.

Jantzen didn't offer a 2.75 mH 18 AWG air core inductor when I did my crossover mod, so I used a 3.00 mH 18 AWG inductor and unwound it. Their current 2.75 mH 18 AWG inductor has a part number of 0063, rather than 0049, according to the parts list I found here:

http://www.jantzen-audio.com/wp-content/uploads/2013/04/Air-Core-Wire-Coils-List-01-04-2016.pdf

Part # 0063 is what I would have ordered had it been available at the time.

Other SDA SRS mods:

Wood panel replacement:

http://forum.polkaudio.com/discussion/131134/curly-maple-end-caps-and-side-strips-for-the-sda-srs

Original SDA SRS modification thread:

http://forum.polkaudio.com/discussion/19053/improvements-to-the-sda-srs

Tweeter bracket and driver rings:

http://forum.polkaudio.com/discussion/105441/sda-tweeter-brackets-for-sda-srs-1-2tl-sda-srs-and-sda-crs/p1

Cardas rewire:

http://forum.polkaudio.com/discussion/143888/tweaking-home-theater-pt-8-cardas-wire-for-front-stage-speakers