Picked up a mint pair of SDA CRS +'s...I'd like to bring them back to their former glory, or better.

xschop wrote: »

Will he need the 1/4" female fastons for the -198 tweets?

I have all kinds of stuff like that around here from doing car audio stuff. I got those. I’m just not sure about the rest.

Also does anyone know where I can get four of these? They are good on the other crossover but these arrived broken off like this and I’m not sure how I’ll mount the crossovers otherwise. I’d like to try to keep it somewhat “stock-ish” mounting wise.

Excellent. Thanks for the detailed help. I’ll look into ordering those resistors tomorrow or Monday.

I may give those standoffs a try and if they don’t work out I’ll try to salvage the old ones from the other crossovers.

And don’t you worry. I won’t be making any permanent decisions without first showing pics or videos on here. Haha.

In the mean time, I’m going to start dynamating the drivers next week. I’m assuming I should also do the passive radiators?

How about these two resistors? I’m already ordering most of the stuff from Madisound anyways. I’d rather not order them from England. That will take forever and cost an annoying amount in shipping.

https://www.madisoundspeakerstore.com/mundorf-coppernickel-10-watt/mrec10-mundorf-coppernickel-wire-0.47-ohm/

https://www.madisoundspeakerstore.com/mundorf-coppernickel-10-watt/mrec10-mundorf-coppernickel-wire-2.7-ohm/

All done. And they sound great. I only got 10 or so minutes to listen to them before I left for my gig today. I’m gonna let them burn in the next few days and hopefully sometime next week I’ll actually be able to sit down and really listen to them.

Thanks again for the help.




workjng

I don't think it's related to a driver issue. This is my 4th pair of Polk SDA's. I've had SDA1B, SDA1C, SDA2B, and now these. They all had that same characteristic. I think it's just a product of the SDA effect. It is what it is and I"m not terribly concerned with it. I just cut 500hz on all of them when it got annoying. No speaker is perfect. They all have pros and cons. I just hope these tweeters/caps come around after burn in, or that I simply get used to it. People tend to neglect brain burn in. It's a thing. haha.

I'm not familiar with the PR push test? It does sound familiar, though. I vaguely remember a test where you push one of the 6.5" drivers in and see if the cab holds the pressure difference by seeing what the other drivers do. Is that what you're referring to?

nah it's not related to the tweeter..it's a lower mid frequency..and it did it on all of my SDA's before and after I switched to RDO's......I really just think it's an artifact of the SDA effect, which makes sense...when you mess around with phasing like that, you're bound to run into some interesting sonic anomalies...

if anyone wants to see what i'm referring to, here's a perfect (and extremely nerdy) example:

Diana Krall-The Look of Love

the main piano riff on the intro is: E flat, D, C, and back to D....and that particular D is the one just above middle C..so it's around 588hz. THAT note really cuts on Polk SDA's. Turn it up loud and you'll see what I mean. It might even hurt. haha. Granted, there are two factors here. The Piano is a little loud in the mix for my taste, AND in general, anything around 630hz is fairly unpleasant to most people's ears. In fact, Dave Natale, sound guy for the Rolling Stones always removes that from his live mixes, and so do I because it sounds like butt. haha. In all fairness, the mixing engineer should have dialed back the lower mids on that piano track, but who knows what they were mixing on. Every speaker, room, mixing console, mic, etc sound different.

Which leads me to one of my favorite topics with audiophiles, EQ. Tone controls and EQ are not the devil. haha. Every single record you've ever listened to uses EQ, and most of them use compression as well. Every audio engineer, including myself, uses EQ more than literally anything when mixing. It's absolutely necessary. I ended up getting rid of all of my Polk SDA's because that weird bump in the lower mids, but then as I learned more about audio engineering, I learned that literally every single speaker has imperfections...every room, every mix..etc....so, now I just cut 500-600hz on my Polk's if a certain track gets on my nerves. I will say though, the CRS's aren't nearly as annoying as my bigger SDA1's were around that range.

Also, every single human being hears things differently, so some of you might not even hear it and that's awesome for you. We're all different. Overall, I ended up getting another pair of SDA's (these CRS's) just because I think it's fascinating how they exaggerate the sound stage. It makes them super fun to listen to. It's not natural, but who cares. It's fun.

I spent a few hours listening to them last night. They def sound better on my tube ST 70 kit that I built. In fact, I’m shocked by how well that amp can drive those speakers.

Question:

I’m trying to further understand exactly what I did.

1. What exactly does that 5.8uf cap do for the tweeter? I’m assuming it high passes, but what frequency and what slope?

2. If I wanted to try the rdo194’s, all I would have to do is ditch that 5.8uf cap and leave the 2.7 resistor, correct?

got it..thanks..but "better" is a subjective concept..the only way to find out if you like something more or think it's better is to find out for yourself...everyone perceives sound, and life in general, differently....