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Messages - Luddite

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The original "magic cable" was only for digital amps that do not have a common ground. The 10k resistor was to isolate the grounds so the amp didn't self destruct.
 
I hope this helps clear up a little confusion if any existed. :)
Ed

Thanks for the clarification, Ed. I never knew (or perhaps forgot) that the 10K resistor only applied to digital amps. I assumed (yes, yes, I know) that it had something to do with the attenuation of the signal into the subwoofer amp. So for a "normal" amp, an interconnect with no added resistance would work? If so, that's even easier.


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Capt. Z, I agree with your instructions to vrod, except that Ed's "normal" Magic Cables used a 10K resistor per channel, but in this thread from 2013 https://tubehifi.websitetoolbox.com/post/Subwoofer-Project-6426090?&trail=135 Ed recommended using a 600 ohm resistor per channel when used with the Crown XLS series of amps.

Vrod, measure the resistance of your Magic Cable(s). If they're approximately 600 ohms you don't have to do anything except hook them up off your main amp's speaker terminals, as Capt.Z suggested. If they measure closer to 10K ohms, you may want to either change the resistors to 600 ohm, or just build yourself a new set of Magic Cables.

Oh, and one more thing. If you're going to bridge your Crown to take advantage of the 1550 watts (and you really should!) your XLS-1502 is capable of bridged, then you're going to need a Y RCA (two female to one male) adapter. The Magic Cable male RCAs will plug into the adapter, and the adapter into Channel #1 of the Crown, then select Bridged mode from the main menu.

Here's a link to the Crown XLS owners manual, if you don't have it. Refer to page #7 for connecting a single sub (your Cube) in bridged mode. https://www.crownaudio.com/en/product_documents/5055568_xlsdc2_mnl_print_050615-pdf-3c14253d-8643-4157-ba5d-cee9232d2a32
 

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General Discussion / Re: Crown xls
« on: February 22, 2021, 04:47:02 PM »
Thank you Ed. My system is apart at the moment, while I take up the old wall-to-wall carpeting underneath it. When I hook everything back up, I'll try the Crown in "stereo" (as opposed to "bridged") and report back.

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General Discussion / Re: Good to see The Horn Shoppe Forum again
« on: February 06, 2021, 02:23:29 PM »
Hey guys, the old forum went away. The data base is still there but SMF can't access it so I just started over. Sid and Hayden tried for a few hours to "fix it".
Ed

That's not good to hear, but thanks to Sid and Hayden for trying.

I do have a couple of pictures I've saved, like Ed's "Magic Cable in progress", showing resistor placement. Also Ed's Great Horned Heil crossover sketch, Dayton APA-150 sub amp hookup configuration, and "test point" photos for zero biasing The Truth, if anybody needs them.

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General Discussion / Re: Crown xls
« on: February 06, 2021, 02:10:38 PM »

just split the output......it should be fine, I'm doing just that now for "convenience". The Truth can drive 2 outputs but given a choice I go the other way.

Hope this helps.
Ed

It does help, Ed, thanks. With my tube amps I do have the Magic Cable choice, but not with the First Watt F1J, as you know.

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General Discussion / Re: Good to see The Horn Shoppe Forum again
« on: February 04, 2021, 02:32:25 PM »
I'm on, Sonic, but I'm at a loss as to how to answer.


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General Discussion / Re: Good to see The Horn Shoppe Forum again
« on: February 02, 2021, 02:12:14 PM »
Hopefully the others find their way in.

Thanks Sonic.

It took a while to find the Forum again (my old bookmarked link no longer works), and I had to re-register, as my log-in wasn't recognized. I just got my approval this morning.  I'm really hoping there's a back-up, and the previously posted topics can be restored. There's a LOT of valuable information regarding The Truth, Horn/Heil crossovers, etc. etc. and hopefully that wasn't permanently lost.

And speaking of "lost", where's the big guy? Hopefully he's doing OK.

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General Discussion / Re: Crown xls
« on: February 02, 2021, 01:59:04 PM »
Quote
Is it ok to use the Crown xls with the Cube. To me it seems like overkill. I thought I read in the old forum that you could'nt use the Crown XLS in the bridged mode( the cube is a 4ohm  load

Hi Vrod,

Yes, it's OK to use the Crown XLS series with the Cube. I've done it several times with my XLS 2002, without incident. Ed goes into detail about bridging the XLS here https://tubehifi.websitetoolbox.com/post/Subwoofer-Project-6426090?&trail=15, saying he parallels his bucket subs with the XLS, which he reminds us would be a 4-ohm load.

And from page 7 of the Crown XLS users manual: "BRIDGE mode delivers the power of both amp channels into a single load of 4Ω or greater".

As for whether using any of the XLS amps with the Cube is "overkill", that, I suppose, is subjective. But my own experience has been that I got much better performance from my Cube with the XLS 2002 than I did when I ran it with the Dayton APA150 amp I first used it with.

I hope that helps.

I have the parts for my Bucket Subs, and spent last night reading the thread linked above, trying to sort out how (or more accurately, "If") I'm going to be able to use them. I can't use Ed's "Magic Cable" off the terminals of my First Watt F1J amp because of the type of circuit it is. It would likely "smoke" the Crown. The dilemma is, the F1J is easily my best sounding amp with my Horns/Heils, and I've never been willing to give it up.

I've thought about adding an extra pair of RCA jacks on the output of The Truth to drive the Crown, but reading that Transcendent Sound forum Bucket thread again last night, Ed was pretty adamant that it would degrade the sound. My only other choice would be to sideline the First Watt and use one of my tube amps instead. Either way is a compromise, and so far I've opted for less bass and a better mid-range and top end.


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