SDA-SRS 2 (Bi-Amp version) w/198's
Hamatym
Posts: 269
OK, I think I know the answer already.....BUT Inspiredsports got me thinking. Can the Bi-Amp version of the SDA-SRS 2 ever be converted to handle RDO-198's? I just got these and added RDO-194"s...all stock XO's which sound much better than I expected. I think the answer is no 198's and live with the RDO-194's.....but had to ask as I like the 198's more.
Any input is appreciated, and if there is an answer I would love help!
Dan
Any input is appreciated, and if there is an answer I would love help!
Dan
Post edited by Hamatym on
Comments
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It isn't the tweeters that cause the issue. It is whether or not you can tie the grounds together. for the SDA effect.
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It isn't the tweeters that cause the issue. It is whether or not you can tie the grounds together. for the SDA effect.
HUH ?
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AFAIK, the differences between the 194 & 198 has never been clearly explained on here, or what precludes them from being interchangeable. Will the crossover burst into flames while the Earth opens up to swallow you,:eek: or....will it just not sound as good as it would with the correct driver/s installed ?
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AFAIK, the differences between the 194 & 198 has never been clearly explained on here,
Referring to an explanation that a non-tech person (me) can understand. -
I suppose that's a concern--but--it's a completely DIFFERENT concern that the original poster is dealing with.It isn't the tweeters that cause the issue. It is whether or not you can tie the grounds together. for the SDA effect.
Most folks wouldn't refer to the SRS2 as "non-bi-ampable" or "bi-ampable". They'd say "blade/blade" or "pin/blade" SRS2. But, yes, the pin/blade SRS2 does have the jacks on the back for biamping.
I suppose if the low-frequency amps are common-ground you'd be OK; and if not, you'd need an AI-1 or similar substitute. By my reading of the schematic, there's no SDA cross-coupling in the HF crossover, so it wouldn't matter if the HF amps were common-ground or not AS LONG AS THE JUMPER WIRES CONNECTING THE BINDING POSTS ARE REMOVED.Referring to an explanation that a non-tech person (me) can understand.
Different frequency response, different impedance.
In some other designs, for example the blade/blade SRS 2/SDA 1B, the crossover has a 4.4uf capacitor to filter out the low frequencies from the tweeter circuit. Replacing the 4.4uf capacitor with a 5.8uf capacitor is about all that's needed to "convert" to the 198s from the 2000/194. But there's no guarantee that that modification will work with the later pin/blade SRS2/SDA 1C style crossover. Apparently, no-one has tried it; or worked the math to prove/disprove that changing that capacitor makes for a successful upgrade to the 198s.
If I owned the 1C or later SRS2, I'd yank the 4.4 for a 5.8, swap tweeters for the 198s and see what happens...but I don't, so I can't. I did do that with my 1Bs, but I was just copycatting a mod already proven to work.
Seems to me that if both the early and late SRS 2s use a 4.4 cap in the HF crossover; and if the early one can be swapped for a 5.8 to tune the crossover for the upgraded tweeter...my intuition says that same deal applies to the later SRS2/1C crossover, too.
Some folks feel better about "engineering" than they do about "intuition". And that's ok, too. -
Why not just upgrade the crossoversJC approves....he told me so. (F-1 nut)
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Thanks for a lot of the info guy's! Here's the thing, I always here the SDA 1C's / SRS 2 P/B CAN NOT be modified to take the RDO-198's....but yet there seems to be a way that others think it can.
I have modified 2.3TL's and SDA-2B TL'd, so I would love to upgrade the SRS-2's and keep them in the same 198 "Family". I don't mind being a test mulem but my skills upgrading XO's is not good. I relied on Ben to handle these issues. Ok, well no biggie...I was more curious than anything. The RDO-194's are certainly a HUGE improvement, so I am not complaining!
Thanks all! -
I'll be honest and tell you I really read this thread poorly.
Now for my take on the real question. I can't see why you wouldn't be able to do the swap. Like Schurkey said:In some other designs, for example the blade/blade SRS 2/SDA 1B, the crossover has a 4.4uf capacitor to filter out the low frequencies from the tweeter circuit. Replacing the 4.4uf capacitor with a 5.8uf capacitor is about all that's needed to "convert" to the 198s from the 2000/194. But there's no guarantee that that modification will work with the later pin/blade SRS2/SDA 1C style crossover. Apparently, no-one has tried it; or worked the math to prove/disprove that changing that capacitor makes for a successful upgrade to the 198s.
I would surmise that subbing a 5.8uf cap in place of the 4.4uf would do it. Looking at the schematics it doesn't look like an issue. It's a shame they never made these in a TL form. -
Well, since I had Ben do my 2.3TL XO upgrade....I gave him a shout and He said he would give a full XO upgrade and involve this (potential) TL mod as well!
If this works, it should work for SDA-1C's as well right? Please anyone else chime in on this topic before I cast them off to Ben. Much appreciated! -
I hope that it works out for your p/bl.SRS2s. Does the 198 sound that much different/better than the 194? Are you going "top shelf" with your caps & resistors when you have Ben upgrade the XOs ? I'm waiting to do mine until I can afford the Mills-Sonicap parts + the cost of 4 tweeters. Now, it looks like I might end up with a choice of which tweeter to install. Can't wait to hear how it goes !:D
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Ah the age old question as to which RDO is better...ha ha Both are awesome!
To get in my head, here are my personal thoughts:
- If you want to save a couple bucks and plan to keep the XO stock, go RDO-194's along with the other simply mod's....then call it a day for a great sound!
- Now if one can spend the extra $$ for a full XO upgrade, I found the RDO-198's react better than the 194's, and the clarity goes to a whole other level.
Just my thoughts, I also like keeping all the tweeter's alike incase I ever have to mix in speakers years from now. I am on a 198 mission...ha ha -
Any update on the success or failure of the 198 upgrade to a 1C or SRS2 with pin/blade?Well, since I had Ben do my 2.3TL XO upgrade....I gave him a shout and He said he would give a full XO upgrade and involve this (potential) TL mod as well!
If this works, it should work for SDA-1C's as well right? -
Well I went a different route and they are now in dcmartinpc hands for this upgrade. I think he is selling off some speakers before hand, but the question is still valid. I decided to change my inventory to models that take the SL3000 stock...then upgrade the XO's and 198's to be safe:)
