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Post subject: Blues Jr and PA system
Posted: Mon May 17, 2010 1:53 pm
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I play in some blues jams. The organizer likes to run everything into the PA system. I have both a Blues Jr and a 75 Watt Line 6 Spider Jam.

Is there anything to worry about plugging my Blues Jr into a PA system out of the speaker jack?

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Post subject: Re: Blues Jr and PA system
Posted: Mon May 17, 2010 2:14 pm
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markara wrote:
Is there anything to worry about plugging my Blues Jr into a PA system out of the speaker jack?


I can promise you one thing......you'll only do that once!

:mrgreen:

Your sound man needs a line-level signal (ie: from your BJ's preamp). That's about 750 millivolts. Your speaker output is generating around 70 volts -- it will without a doubt fry the PA's mixing board so bad they'll be able to smell the smoke all the way up in Heaven.

Basically, you can't get "there" from "here". Thus, stick with a microphone on a stand.

HTH

Arjay


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Post subject: Re: Blues Jr and PA system
Posted: Mon May 17, 2010 2:15 pm
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markara wrote:
I play in some blues jams. The organizer likes to run everything into the PA system. I have both a Blues Jr and a 75 Watt Line 6 Spider Jam.

Is there anything to worry about plugging my Blues Jr into a PA system out of the speaker jack?
I guarantee you will let out the flying monkeys. :shock:


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Posted: Mon May 17, 2010 2:56 pm
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Lots of magic smoke and yep, you'll only do it once. :shock: I'd just mic it.

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Post subject: Re: Blues Jr and PA system
Posted: Mon May 17, 2010 2:59 pm
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budglo wrote:
markara wrote:
I play in some blues jams. The organizer likes to run everything into the PA system. I have both a Blues Jr and a 75 Watt Line 6 Spider Jam.

Is there anything to worry about plugging my Blues Jr into a PA system out of the speaker jack?
I guarantee you will let out the flying monkeys. :shock:


I wouldn't mind if he does fry the PA. I am not being plugged into the PA for not enough sound, what he wants to do is control all the sound himself.

So what I am understanding here is that this is a bad idea for him but won't harm my gear? is this correct?

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Posted: Mon May 17, 2010 3:53 pm
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No. Plugging anything other than a speaker into the speaker out jack of your Blues Jr. will destroy your amp. The only ways of safely making a BJ louder without ruining it are (1) an extension cabinet of the same impedance as the amp (8 ohms, I believe); or (2) putting a mic in front of it.

There is no way to run a line out to a PA from your amp. DON'T DO IT OR YOU WILL BE BUYING ANOTHER AMPLIFIER.


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Posted: Tue May 18, 2010 1:46 am
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If you unplug the speaker from your amp and then turn it on it will be history. Don't do it!

Cheers,

Snowy


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Posted: Tue May 18, 2010 3:18 am
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I played a Festival in Country South Australia where it was a 300 km drive from the city I live in.

For such a trip I threw in the boot of my car my Blues Junior as opposed to the HRD 410. I think my car appreciated that...LOL...

I had never tested the BJ for an outdoor gig before this, so I was a bit nervous as to whether the BJ would cut it.

I had the Sound Engineer mic it up with an SM57 and had him give me a send through my fold back and whammo...tone tone tone with no break up and less work.

This was with a Reggae Band, that is why I couldn't have the amp breaking up on me for those clean Reggae Chops...

Line up was; Drums, Bass, Keyboards, 2x Guitars and a Harmonica player...

The BJ didn't let me down...

Mic it up Mate... :wink:


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Posted: Tue May 18, 2010 3:58 am
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Agreed,

I find when using the BJ on gigs I just wind the Master Vol to 12 and then just bring up up the Volume knob until I hit the sweet spot where I just get that edge of breakup, usually around 5. Really just treating the amp like a Non-Master amp I guess. Then mic the amp and just bring enough level through the PA so that you can hear the sound fill-out.

Interesting thing is I've never had anyone say that sounded "boxy", only ever had compliments, so definitely mic it up, it's worth the little extra effort, your sound guy will have the control he wants and your amp will sound huge.


Cheers,

Snowy


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Posted: Tue May 18, 2010 10:08 am
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As an alternative to the Sure SM57, I really like the Sennheiser 609. It is a 'flat' mic and all I do is hang it over the front of the amp with the mic cable through the amp handle. It eliminates the need for a mic stand or other mic holding device (although some people use this same method for mics shaped like the SM57....but hanging the SM57 makes it more suseptable to feedback).

The 609 will run $100-$120 plus you'll need a mic cable of sufficient length, probably around $25 for a mid grade one.

Listen to what the others have told you! Don't do anything but mic it!

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Posted: Tue May 18, 2010 6:21 pm
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Gosh. A sound engineer that wants to control the sound himself.. how odd :wink:

I do like the SM57 for mic'ing cabs and can see why it's probably the industry standard. It's the small capsule - makes the mic more honest and analytical - and doesn't flatter the sound the way larger capsules will.

A stand is always useful though, rather than hanging over the cabinet. You need to be able to move the mic away to control the bass proximity effect you get when using dynamic mics close up.

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