SDA CRS+ Crossover recap
Comments
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@F1nut I agree, I should upgrade those stands a bit. They do have some rubber pads on the feet and on the tops where the speaker sits.
I think the next thing I would like to do with these is a really nice veneer. That dyed maple you showed me a while back would look crazy on these."Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb. -
Nice work. Do yourself and your ears a favor and get rid of the sl2000 tweeters and get the RD0-194's. They are plug n play designed by Polk to "fix" the issues the sl2000 has.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul! -
4.1tl mod.......
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@heiney9 I have a pair of RD0-194, but I just wanted to listen to the speakers as is with the original tweeters. I'll probably switch the tweeters out next week to hear the difference. For some reason the SL2000 doesn't seem as annoying in the SDAs as in the monitors.
@pitdogg2 with the 4.1tl mod what are the benefits? I've been told that to upgrade to the RD0198-1 is relatively easy as well.
"Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb. -
It gives you the ability to use the RD-0198 tweeter. 5.8uf cap across the 2.7 ohm resistor and add a large faston on white ground wire to tweeter.
https://us.v-cdn.net/5021930/uploads/attachments/1/8/5/1/1/26710.pdf -
Just remember which ever RD0 you choose, give them ample break in time before forming an opinion.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul! -
The RD0-194 I have currently reside in a pair of monitor 5Bs I’ve been playing with.
BTW - Tweeters don’t break in. 😂😂 they sound exactly the same as when I first bought them.
The woofers on some of my other more expensive speaker did require some break in time but the Audax tweeter those came with sound exactly the same as the first day."Equality is a myth to protect the weak. Some of us are strong in the Force, others are not. Only a fool believes otherwise." - Sith Proverb. -
Check out these two threads which show how WMG and xschop approached the issue of backwave control in these. Also check out how WMG did his boards, not that yours aren't fine 😉
https://forum.polkaudio.com/discussion/169838/sda-crs-crs-something-different/p1
https://forum.polkaudio.com/discussion/177189/take-a-guess/p1
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
WMGs crossover above was the tl mod. You could use that as a template if you ever decided to go that route.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
This has long been on my list of diy upgrades, now retired I think this has my name all over it. Any chance you have the source / part# for the parts, I would like to do the same mods, I blew out the woofer years ago and replaced them and updated the tweeter to SL3000 ?? I believe ... cant find the paperwork any longer. But did have the schematic update for the newer tweeter.
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How tall are you?? 👀👀😁😁- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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@mwk1001 When I zoomed in on your photo I didn't see any foam ring so it must be that you bought the RD0198-1 silk dome upgraded ones. Check and make sure you have RD0198 (5.39 Ohms) and not RD0194 (6.6 Ohms).
You already did most of the homework by grabbing the schematic. I think if you read that link above he said that he only did the low pass inductors for the midwoofers and he used Jantzens. you could find them maybe at partsconnexion.com. He used Sonicaps from soniccraft.com which are highly favored around here, for all the caps and Vishay/Mills 12 W resistors.
Oh, for the sub bass inductor he used Erse Super Q? For that you will have to look at Uscoils.us.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
" When I zoomed in on your photo I didn't see any foam ring so it must be that you bought the RD0198-1 silk dome upgraded ones. Check and make sure you have RD0198 (5.39 Ohms) and not RD0194 (6.6 Ohms)."
Thanks for that. I was not sure after going thru the threads, my purchase doc was lost but the schematic was saved in 2016 so that is when I upgraded them. I found the mills resistors and went with Clarity CSA's for tweeter/midrange Clarity PX for the SDA 6.5 driver (2x20)
Some fun reading the humble homemade HiFi capacitor page and balancing crazy money against my enjoyment of the CRS+ I had sonicap/mundorf supreme in my head but I'll try these CSA/PX's see how it goes.
@vr3 How tall are you?? Yeah I know, The "dream" was to have that wall like a real library with rolling ladder and all ... Then they would have had a custom space carved out with room in the rear a tad lower
. But that has not happened yet ... you know we have only been here 20 years ... I have a nice woodshop but everyone else's stuff seems to come first !! I even have a tiny 3 axis milling machine that I made the baffles for my office speakers from a planet10 box design and CSS fr-127 full range drivers hooked up to an Ncore 2 channel DIY..
Found the box of old drivers and a slip of paper saying they were the RD0194-1 I'll double check but odds are this slip is correct I have 0194-1. So no 5.8 cap ?
The things getting in the way ....
Post edited by mwk1001 on -
I guess you still need to check the DCR of the tweeters to see which ones you purchased. If they said SL3000 compatible or something like that, you probably have the RD0198-1. That shouldn't be a perfect match for your unmodded crossover without doing the tl mod, which you are planning to do.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
No need to bother measuring. The easy way to tell is the tabs on the RD0194-1 are the same size while one tab on the RD0198-1 is bigger than the other.
Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Grr. Off it comes again. I think I'll do both since the photo I took I cannot make out the tabs well enough ! if 194 i'll probaly just get the 198's in for a penny .....
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Same size tabs.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Same size tabs and 7.5 Ohm across the unplugged driver ??
Probably my meter jumping around alot but plugs are clearly the same size and all measures are 6.6 ( one ) the rest higher ...
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Yep. I don't know what meter you are using and it doesn't matter. If the tabs are the same size it is the RD0194-1.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
I sent a note to polk parts and I see some about ... so 0198's it will be .
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I sent a note to polk parts and I see some about ... so 0198's it will be .
Just call the CS number and mention you're a member here at club Polk.
1-800-377-7655
Depending on the CRS model the RD-0198 is not drop in compatible, there is some XO work involved to work correctly.
edit: I see you have the correct schematic to use them. -
Hey Jesse,
What's this and where?
"Replace the broken plastic standoffs with metal hex standoffs."
Does that also include my SDA SRS's? -
Are these crossovers specific to a certain year on crs speakers because mine look nothing like this?
Also, not sure if it was brought up, but don't forget to glue the drivers.
If you set them up in a room where they have more than 3 feet to the side wall, let the real magic begin. I'll never forget when I hooked my crs speakers for the first time, but I had 10 feet on either side. Sold all my other ones as I was hooked. -
skipshot12 wrote: »Hey Jesse,
What's this and where?
"Replace the broken plastic standoffs with metal hex standoffs."
Does that also include my SDA SRS's?
They are the white plastic pieces supporting the board.
No.
Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
skipshot12 wrote: »Hey Jesse,
What's this and where?
"Replace the broken plastic standoffs with metal hex standoffs."
Does that also include my SDA SRS's?
Original standoff from Polk were a plastic/nylon that the crossover snapped over on either the binding cup or board above the binding cup. Most of us reused them or bought longer nylon or metal hex standoffs to use for the larger caps we may have soldered under the board due to size constraints on top.
On the SRS-SDA yours is behind the aluminium XO plate you see on the front of the speaker. -
Gardenstater wrote: »Check out these two threads which show how WMG and xschop approached the issue of backwave control in these. Also check out how WMG did his boards, not that yours aren't fine 😉
https://forum.polkaudio.com/discussion/169838/sda-crs-crs-something-different/p1
https://forum.polkaudio.com/discussion/177189/take-a-guess/p1
Bump for the current CRS builders. I tried finding an old pic/post where I found 3.5" long styrofoam cones from the hobby store that worked perfect for the stand-off foam mod.Don't take experimental gene therapies from known eugenicists.
