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Thread: Feedback on Crown DC300A as LF amp

  1. #16
    PSS AUDIO
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    Originally posted by Ian Mackenzie
    Have a look at some of the newer mostfet pro power amps, they are surprisingly cheap these days and can really dump some current into low impediance loads.

    Ian
    Good morning!

    But how do they sound?

    That IS the question, do they sound good or do they sound bad?

    What is the use spending little money for an awful sound?

    About DC and Crown DC300 amplifiers letting DC in and out, the best thing is not placing a filter in the audio circuitry as you will loose the benefit of DC sound, one must place, as I do, at the output of the amplifier a DC detector and when there is more than 2V, then the output relay disconnects the speaker from the amplifier.

    The trick is done and you can have all the benefit of those very low frequencies one cannot hear but one can feel!

  2. #17
    Alex Lancaster
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    Smile

    Loved that trick of using an amp to get 60Hz!!; Now You can buy not too expensive solid state phase inverters in all sizes, but they use to be horribly expensive, specially the motor-generator type.

    Alex.

  3. #18
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    Quote Originally Posted by SteveLeigh View Post
    This act of insanity was forced upon me (us). I traveled to Europe with a very hot band, we tried a voltage converter, but the Hammond requires 60Hz to synchronize. 50 Hz get you flat, well below pitch. It became a frantic event to get the damn Hammond to play.

    The solution was right under our noses, but it took a week to see it. If I recall properly, we sent 60Hz to the input, slowly cranked the output, and found 115vac on the terminals. 60 seconds later, the output was connected to a normal wall outlet, and during that and subsequent tours, we never had a drop of trouble with line freq synchronization.

    FWIW - the Hammond is the only motor driven instrument on stage. Everything else can get away with 56 HZ or 62 Hz.

    Side note: I bought my first JBL 4320s in 1971. Then bought a 2nd pair. Still have 'em, still love 'em. And here's the kick: they're guaranteed for LIFE.

    The foam surrounds on the 2215 LFs have disintegrated from components in the ozone *FOUR TIMES*. Complete rebild cost absolutley zero. A call to Northridge, I selected a quality recone shop locally, JBL shipped complete rebuild kits out for all 4 2215s, and replacement = no charge. Amazing for speakers originally sold in 1971.

    Plenty of interesting recording data at my site:



    Best,
    Steve "Looney" Leigh
    I tried to buy an organ from this guy, but this guy is a not job. The used organs that he had left out in the yard were worthless and overpriced. When I refused to buy one from him; I started receiving crank phone calls late at night. Then I find these two sites about him. http://www.jsbigdog.blogbus.com and http://www.greatauntirma.wordpress.com He has been charged and convicted of making harassing phone calls against someone.

    He claims to be some sort of famous musician, so he has given up his right to privacy. He is also violent. He has a restraining order from his ex-wife from when he was beating her.

  4. #19
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    Luckily, it looks to be some 6 years since he's graced this site with his presence.

  5. #20
    Senior Member jbl_daddy's Avatar
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    I used a DC300 ll running two B380's in my theater and replaced it with a crown k2. Much more distinction on the sub. I still use one in mono for a single B380 in my family room and am very happy.
    Well why not it's just one more pair...
    4340's and 250ti's what an odd pair...

  6. #21
    Senior Member louped garouv's Avatar
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    Quote Originally Posted by jbl_daddy View Post
    I used a DC300 ll running two B380's in my theater and replaced it with a crown k2. Much more distinction on the sub. I still use one in mono for a single B380 in my family room and am very happy.

    do you think it's the additional power you are liking?

  7. #22
    Senior Member jbl_daddy's Avatar
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    Yes, I immediately noticed the difference. I am a huge fan of the DC300 so please do not think i am bashing them. Ps. I own 4 DC300's and would never part with them.
    Mark
    Well why not it's just one more pair...
    4340's and 250ti's what an odd pair...

  8. #23
    Senior Member Doc Mark's Avatar
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    Greetings, All,

    I still have my first Crown DC300, which I got in a trade from our keyboard player, back around 1980. Our band used to use it for PA use, and once, up in Minneapolis, the Crown passed DC to our crappy Bose 802 copies, and friend all those little speakers!! Got the amp fixed at a Crown dealer, and it went into storage. I got it when looking for a big amp, and my friend offered to trade it to me for a VW Fastback with a blown engine! I snapped up the trade, and have used that old amp for many happy years since then, with no problems, at all!

    OK, enough reminiscing, here is my question: What are the differences/upgrades from the Crown DC300, to the DC300A, to the DC300A II, and then the PS 400? I have that old DC300, plus two DC300A's, and recently scored a D150AII and D45A, and want to use the lot of them in an all active system. As a side note, my old friend from whom I traded my VW for the DC300, recently gifted me a huge Peavey CS1200X amp, which is a real brute!! As a subwoofer amp, that one might have some use..... But, an all-Crown system rather calls to me, too.....!! Thanks for any thoughts, or comments, on the differences between the old Crown big amps. Take care, and God Bless!

    Every Good Wish,
    Doc
    The only thing that can never be taken away from you, is your honor. Cherish it, in yourself, and in others.

  9. #24
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    Someone may well be more knowledgeable than I on this, but my rather vague recollection is that the A had "IOC", input output comparison, essentially clipping indicators. I seem to recall that there was even an upgrade kit available at one time. As to the II series, I'm afraid I don't know as that was after my time. Hope that's of some help!

  10. #25
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    I don't know much about the DC300A except that it's rather industrial looking and most wives wouldn't want it sitting in the living room. To appease the wife I put my DC300A in a nice walnut Phase Linear case...It fit perfectly without any modification. The only issue is the walnut case can cost nearly as much as a used DC300A.
    Attached Images Attached Images  

  11. #26
    Senior Member Doc Mark's Avatar
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    Hey, Paul and Bill,

    Thanks, very much. Bill that old Crown looks great in it's new home. Nicely done. I'm lucky in that Sweet Bride knows that musicians needs their "stuff about them", and she has no problem with Crown amps, or just about any other musical gear, in the living room, as long as it's arranged nicely. If this Crown amp project comes to fruition, I'll have to change my Hi-Fi cabinet, as the current one, which I built back in 1983, is chock-full, and there is not more room. I'd like the Crowns to be rack-mounted, as they are easier to hook up, and maintain, that way. At least for me..... Thanks, again, for your comments, and I look forward to hearing more comparisons from other members, too. Take care, and God Bless!

    Every Good Wish,
    Doc
    The only thing that can never be taken away from you, is your honor. Cherish it, in yourself, and in others.

  12. #27
    RE: Member when? subwoof's Avatar
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    300

    there were at least 9 versions of this amp - and I have used / serviced /still own one of each vintage in my collection.

    The very first 2 gens ( DC300 as used at woodstock ) were different ( no opamps. hysteresis switch ) and they are the only ones that have a continuous front panel with fuses - all the "A" subsequent versions had ears that could be removed but no "end bars" were ever made available like the other "D" amps so they did not sell as well as the 150 or 60/75's that could.

    sub

  13. #28
    Senior Member martin2395's Avatar
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    Is this the oldest version of the DC300?

    Name:  1967-crown-DC300.web.jpg
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  14. #29
    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by Doc Mark View Post
    What are the differences/upgrades from the Crown DC300, to the DC300A, to the DC300A II, and then the PS 400? I have that old DC300, plus two DC300A's, and recently scored a D150AII and D45A, and want to use the lot of them in an all active system.
    Yes, the DC300A added IOC lights. The -II was all black with the front knobs all on the right side and the back was a flipped version of the previous model. The PS-400 added a bit more power, new circuitry, the ability to use balanced XLRs through an adapter, more enclosure over the electronics hanging out the back, as well as turn-on delays, monitor jack, signal-presence lamps, and other upgrades. The PS-series was intended to replace the D-series but the increase in price helped to maintain the D-series popularity and kept those in production nearly as long as the P-series.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  15. #30
    Senior Member Doc Mark's Avatar
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    Evening Sub, and BMWCC,

    Much appreciated, Gentlemen. The little D45 arrived today, and I only wish ALL my amps were in the nice condition of this little amp! I'll test it, and the D150AII, in the next few days, when I drag out some speakers, about which I don't care much, so I don't damage my good speaks. Thanks, again, and God Bless!

    Every Good Wish,
    Doc
    The only thing that can never be taken away from you, is your honor. Cherish it, in yourself, and in others.

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