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  1. #1

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    Default SDA SRS to vintage

    I tried this in "basic hook-ups", lots a views, no comments. Is there any problem hooking up these speakers to my vintage receiver. I ask because I read something about a ground issue with the speakers.

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    What is your vintage receiver?

    The short answer is most, if not all, receivers are common ground, so that shouldn't be a problem. However, the problem you're going to have is that the speakers are 4 ohm nominal loads and most receivers are not rated to drive 4 ohm loads. Even if a receiver is rated to drive a 4 ohm load, a receiver is not going to drive those speakers properly.
    'Political Correctness'.........defined

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    Ditto what F1nut said! If you have SRS, you really need at least 200W/channel, capable of 4ohm load and high current capability and or course common ground. You can hook them up to a receiver, but you will not begin to scratch these speakers capability. Also, look at the upgrades for these speakers if you have not done so. Many are fairly inexpensive, easy to do with the great step-by-step instructions, and can improve your listening experience immensely!
    SDA SRS modded: X’ovrd, de-polyed, inductorized, interconnectorized, re-posted, dynamited, RDO’d, spiked, gasketed, ringed (Larry's), and grill cloth blinged! Done this on my own? Not a chance. Thanks to Raife and all who forged easy to follow upgrades. At least a 100% improvement in sound and my personal listening pleasure! Pass XP-10 preamp, Parasound A21 amp, Pioneer Elite DV-58AV (Ric Shultz modded), Audioquest Sky IC's, No longer need my Sunfire sub after mods...

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    Sounds like you just want to see it they work to just get started.
    Well if you have 4 ohm capability and at least 50 wpc you can use it till you get something better.
    Just don't crank it way up, you know.

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    He has an SX-1980, you're golden -- that's tons of power.
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    I see it is rated at 270 wpc @ 8 ohms and although it indicates 4 ohm capability I ddin't find any wpc specs at 4 ohms. Therefore, crank with caution.
    'Political Correctness'.........defined

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    oh well yea should be good, did you read his mind?

    Quote Originally Posted by Nightfall View Post
    He has an SX-1980, you're golden -- that's tons of power.

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    Quote Originally Posted by PolkieMan View Post
    oh well yea should be good, did you read his mind?
    No, he has another of this exact thread in Hookup/Wiring I think.
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    Thanks for the replies. Yes, I did post in another forum, but got nothing there. Cool, so my 1980 will power them. It's just been re-built, and my tech said it's putting out right at 350 wpc before clipping. This will have to do 'till I can get into separates. Thanks again.

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    oh I thought that you were like the late great Johnny Carson when he played that physic guy (Carnac the Magnificent) with the turban and everything he held up to his head he knew about it.

    http://www.youtube.com/watch?v=9m_dT0wsrGI

    Quote Originally Posted by Nightfall View Post
    No, he has another of this exact thread in Hookup/Wiring I think.

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    Quote Originally Posted by drumiv View Post
    Thanks for the replies. Yes, I did post in another forum, but got nothing there. Cool, so my 1980 will power them. It's just been re-built, and my tech said it's putting out right at 350 wpc before clipping. This will have to do 'till I can get into separates. Thanks again.
    I like how that will have to do. You'd have to be in a pretty large room for that NOT to be loud.
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    It is in a large room, and still gets loud. Past 10:00 o'clock through my L112's, and my ears ring for days.

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    F1nut is right on......The problem with most receivers that drive a 4 ohm load, the receiver will be at the point of a soft clip or (with the volume up, at clipping into 4 ohm loads). This is what fries the voice coils of both the high freq drivers or the mid-bass drivers. I have a set of RTA12c I purchased new in 1984 and drove these with a receiver, I frequently fried voice coils, I was younger and stupid with the ole volume controll, Polk replaced all the drivers I destroyed. But I now drive these speakers with a Parasound HCA 3500 dual mono amp. 500 watts into 4 ohms with ultra High Current capibilities, I have had this set up for 12 years now with no problems and the RTA12c's love this amp. Do yourself a BIG Favor, when you can afford it, purchase a High Current amp that is designed to drive 4 ohm loads at loud listening levels (If that's what you like) We all crank up the volume on our rigs at times, it only takes a second to fri a voice coil.
    Regards: Don scheer

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    I do plan on being very careful with the volume. Usually, 9 0'clock is the norm. As soon as I sell some gear off, I'll start the process of collecting separates (I'm sure the wife will be thrilled).

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    Don't get rid of that 1980. It deserves to be in the hands of someone that will care for it, which it sounds like you are. They're only going to get harder and harder to come by.
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    Oh, the 1980's not going anywhere. I'm going to loose the 1250,1050, the OLA's, L50's, maybe the L100's, maybe the KLH Fives.

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    Quote Originally Posted by dscheer View Post
    F1nut is right on......The problem with most receivers that drive a 4 ohm load, the receiver will be at the point of a soft clip or (with the volume up, at clipping into 4 ohm loads). This is what fries the voice coils of both the high freq drivers or the mid-bass drivers. I have a set of RTA12c I purchased new in 1984 and drove these with a receiver, I frequently fried voice coils, I was younger and stupid with the ole volume controll, Polk replaced all the drivers I destroyed. But I now drive these speakers with a Parasound HCA 3500 dual mono amp. 500 watts into 4 ohms with ultra High Current capibilities, I have had this set up for 12 years now with no problems and the RTA12c's love this amp. Do yourself a BIG Favor, when you can afford it, purchase a High Current amp that is designed to drive 4 ohm loads at loud listening levels (If that's what you like) We all crank up the volume on our rigs at times, it only takes a second to fri a voice coil.
    Regards: Don scheer
    Have you done any mods to your 12C's? I have a pair that I also bought new in '84, and mods (Xovers, BH 5, etc) really take them to another level. They do love power.

    Sorry for the derail - carry on.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills, polyswitches removed, Lg Solen inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips installed on back wall behind MW's & Tweeters, interior of cabinets sealed, AI-1 interface with 1000VA A-L transformer

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    I have done some minor mods to my RTA12cs, But!...I need to do a through rebuild on the crossovers and a few other things.
    My problem is, I rather listen to music than take time to tear apart & rebuild. I know I should do this, But, I never get to it.
    I need to get all the necessary parts and just do it ..Period.

    I love my RTA12Cs.
    Regards: Don Scheer

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    Quote Originally Posted by Nightfall View Post
    Don't get rid of that 1980. It deserves to be in the hands of someone that will care for it, which it sounds like you are. They're only going to get harder and harder to come by.
    For what people are paying for those things, you can rest assured that whoever buys it for $3,500 or $4,000 will take care of it. Unless there is a sentimental attachment, you can sell that thing, have the money to buy some more than adequate separates and really hear what those speakers can sound like.

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    George, I've got more than $4k into the 1980, so it will take a little more than that to pry it away. The separates are almost done; The Holman preamp is finished, the Soundcraftsmen is almost there, and the Carver is waiting on the big caps. I can't wait to hear the big guys on this stuff, but I must say, the 1980 is no slouch.

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    350 watts is enough to get them nearly to their maximum db output isn't it? Something about each 3db increase takes a certain multiplication of watts to achieve.
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    Yes, but separates is where it's at, once you step into that, everything changes..
    No Way But The Hard Way, So Get Used To It!!!

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    Nightfall, 350 wpc is definitely enough to make them happy, but is putting a serious load on the mighty 1980; they are the only speakers I have that put it into protection. I did have the volume at 1:30, listening to Nora Jones. That might have had a little to do with it.

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    I had the same problem. Was running SDS SRS's with a pioneer sx-1250. Did a good job up until the 11 or 12 o'clock position. Then would start to go into protection mode. Moved the sx-1250 to tuner duty and purchased a Parasound amp and Preamp. The Halo A21 and P3. Now running 250/400 wpc 8/4 ohm. What a difference this made.

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    I have an unrestored sx1980 which I think sounds good... I can't imagine what it would sound like fully restored. Thats amazing... It definitely shines like jewel under the light.
    I can usually control my volume knob until friends come over and want to hear my speakers. The SDA's blew them away... some started laughing hysterically since some of them only own those crappy ipod docks and this definitely scares me cranking an unrestored amp, I would be furious with myself if I damaged it.

    Currently running a kenwood 700m and I'm happy with the synergy between that and the sda 2.3s. It's only rated at something like 170wpc. Loud enough for me and sounds great at low volumes as well. Tried my qsc mx 1500a - rated at 350wpc rms and I found I prefered the sound of the kenwood by a huge margin even though it was lower powered. Someone once told me the design of the kenwood amp employs minimal negative feedback, true or not?, but maybe thats why I'm hooked on the sound. Very natural sounding.

    What I learned from that is, although more powerful amps will go louder they may not necessarily sound better, imho watts are not created equally. Maybe it is a unfair comparison between a home stereo vs. pa but just some food for thought. I wish there was a 500wpc kenwood supreme to compare it to.
    Last edited by MAD; 09-22-2013 at 12:18 AM.

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    What I learned from that is, although more powerful amps will go louder they may not necessarily sound better, imho watts are not created equally.
    You have learned well.
    'Political Correctness'.........defined

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    Quote Originally Posted by MAD View Post
    Currently running a kenwood 700m and I'm happy with the synergy between that and the sda 2.3s. It's only rated at something like 170wpc. Loud enough for me and sounds great at low volumes as well. Tried my qsc mx 1500a - rated at 350wpc rms and I found I prefered the sound of the kenwood by a huge margin even though it was lower powered. Someone once told me the design of the kenwood amp employs minimal negative feedback, true or not?, but maybe thats why I'm hooked on the sound. Very natural sounding.
    I'm not disputing what F1 just agreed to. At all. I'm just throwing out that you are not only comparing "watts" here, you're also switching preamps.

    Just looked at a picture of the 700M. That thing is simple, to the point, and gorgeous.
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    Maybe I missed it, but I don't think he mentioned what pre amp he was using.
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    Quote Originally Posted by F1nut View Post
    Maybe I missed it, but I don't think he mentioned what pre amp he was using.
    My reading comprehension sucks. He was only comparing the two amps, the SX1980 was not a result of his final thoughts. Sorry!

    Everything I've read about that Kenwood is highly looked upon by. Are three of them really worth anything near 15k?

    http://www.ebay.com/itm/3-Kenwood-70...item2581fbac66
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    I just got my first taste of the separates thing; Apt Holman pre & Soundcraftsmen MA 5002. First impression, I'm not happy. The 1980 blows them away SQ wise. It seems as though everything I loved about the SDA's is gone. I'm still waiting on the Carver M-4.0t to get finished. The plan was to use the Carver up top, and the MA 5002 for the bottom. I'm holding out hope for the Carver, but am going to look at something else to replace the 5002.

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