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Carvin BX1500: A Love Story

scottfeldstein

Roots and fifths and a little extra.
Jun 20, 2011
6,544
4,412
57
San Marcos, California
endlessblue.bandcamp.com
Carvin BX1500, how do I love thee? Let me count the ways.

Seriously. I picked it up used on Ebay a year or two ago for like $600. This thing has every feature imaginable. Does it have a direct out? Yes. But does it have an adjustable output level? Yes. Is it pre- or post-eq? Yes, yes, yes! Does it have a tube preamp? Yes. Can you bypass it if needed? Yes. Does it have a built-in adjustable crossover? Yes. How about a compressor? Yes! Does it have both parametric mid control and a graphic eq that you can drop in and out of with a switch? Yes it does.

But I think the thing that I love most about it is that it's a "dual mono block" head. That is to say that it puts out 300w at 8 Ohms, 450 at 4 Ohms, and 750 at 2 Ohms. And then it has a whole second amplifier that does the same thing. (And yes! They do go down to 2 Ohms!)

I could, if I went absolutely insane, run eight 8 Ohm cabs off this thing, four per amp at 750w, going down to 2 Ohms a side.

I can, if i felt like it, cast caution to the wind and do what every TBer knows you're not supposed to do: use mismatched cabs. I could just run them each with their own separate amps and volume knobs.

And here's the real insanity. If you bridge the two amps together you get 900w at 8 Ohms and 1500w at 4 Ohms. (Doesn't do a 2 Ohm load in this configuration.)

This is the most fully featured, highest wattage amp I have ever owned. Also, it weighs 10 pounds.

What does it sound like? Nothing, mostly. A little warm, I think. I just came home from a pit rehearsal where I ran 300w into an Ashdown 112 with my Warwick Corvette Rockbass $$ 5-stringer. It sounded big and warm with enough mids to give me a nice burp where I want it. The amp itself was totally flat. Bass, mids, treble, all at noon, and the graphic eq off.

In conclusion: best amp ever. If you didn't know, now you know.

Edit: I thought of something I do not love! That tube preamp, I mentioned? It has a 12AX7 tube. When you turn it up around a quarter way, it sounds like nothing. Turn it up halfway, still sounds like nothing. Turn it up 3/4 of the way up and it sounds... like nothing! You'd think that the whole reason for having this is so that you could get a little grit out of it but it actually does no no such thing. It still baffles me.
 
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I've got the BX500, and it has just about all, if not all, the same features (except power/dual mono). It's a truly amazing amp, and is incredibly versatile.

It really just struck me as a Swiss army knife of bass amps. Does it do this? Yes. Does it have that feature? Yes! Having it is incredibly liberating.

My latest victory is that I've been snapping up cheap 112 speaker cabs. One alone would work for at home practice or maybe a coffee-house gig. Two would be called for in a bar with a rock ensemble. What if I had a bigger gig? An outdoor festival or a larger indoor venue? With another amp, I'm out of luck. With my Carvin I could add a third or even a fourth 8 Ohm 112 cab if I wanted!
 
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Had one for a few years. Very versatile bass head, but also one that should be rack mounted. If you don't mind that, then you really could not ask for more. I actually liked the Graphic EQ and used it over the semi para EQ. Also thought the one dial compressor was actually good. Clean those ribbon cables periodically and you're good !
 
Had one for a few years. Very versatile bass head, but also one that should be rack mounted. If you don't mind that, then you really could not ask for more. I actually liked the Graphic EQ and used it over the semi para EQ. Also thought the one dial compressor was actually good. Claen those ribbon cables periodically and you're good !

I have mine in a nylon Gator rack. Just so it can have handles and a shoulder strap. There's nothing else in it. Also, I tend to use the graphic EQ as a slap setting. I scoop the EQ and then just flip it on for the songs I'm going to get slappy on. The other EQ settings I tend to leave pretty flat.
 
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I had a BX500, one of the first that came out. I loved it, but it had issues.

A few years later I picked up a BX700. Loved it, and it had NO issues.

I've now played hundreds of gigs with it and love it like nothing I ever played through before. I've owned GKs, Hartkes, Ampegs, Fenders, Peaveys, and a bunch more I can't remember. This head stopped any and all amplifier GAS dead in its tracks.

I can get any sound I want out of this amp, in any setting.

So sad they don't make them anymore.
 
I have the BX1500 also. Very versatile, but about a month ago, I started getting this static/hiss sound coming from the preamp section. When I bypass the onboard peamp by running a preamp pedal into the effects return it sounds great. My local electronics tech can't seem to figure it out. Kind of frustrating.
 
I have the BX1500 also. Very versatile, but about a month ago, I started getting this static/hiss sound coming from the preamp section. When I bypass the onboard peamp by running a preamp pedal into the effects return it sounds great. My local electronics tech can't seem to figure it out. Kind of frustrating.

Maybe the tube is shot? And can't you bypass it with a switch on the back?
 
I hear you. My amp GAS stopped when my current rig came together: Epifani 4x10 capable of handling 1000 watts at 4 Ohms powered by a Carvin B2000. You wanna talk power? It currently pumps the full 1000, and I could, if I wanted to send the hurricane back out to sea, add a 2nd compatible cab and run it at 2 Ohms and 2000 watts. Though considering I've never needed to run the current rig over about 3, even live without a PA, that seems unnecessary. Talk about headroom! And it sounds great.
 
I've had both a BX 500 & a BX1600.......without doubt the best value & sound for the dollar.
But, yes that tube was a gimmick, which was a shame, think how much better it could have sounded
had it been utilized correctly in the circuit. Maybe a hobbyist could modify it & turn it into the "Holy Grail" ?
 
and I could, if I wanted to send the hurricane back out to sea, add a 2nd compatible cab and run it at 2 Ohms and 2000 watts.

Sometimes someone says something and I get to wondering...in this case, what is the power output of a hurricane?

A LOT, as it turns out. 6.0 x 10^14 Watts.

Or to put it in ways that don't require math, something I am awful at anyway:

"Every second a hurricane releases as much energy as the explosion of a atomic bomb at Hiroshima. The energy released by a hurricane would, if converted into electricity, power the United States for 3 years."

So much for my plan of grabbing all my power amps and cabs and becoming the Savior Of Florida.
 
I have the BX1500 also. Very versatile, but about a month ago, I started getting this static/hiss sound coming from the preamp section. When I bypass the onboard peamp by running a preamp pedal into the effects return it sounds great. My local electronics tech can't seem to figure it out. Kind of frustrating.
Did you run a short cable between the Send and Return jacks ? Also, it may be the aforementioned ribbon cables contact points that need a bit of Deoxit. Suggest it to your tech if the Effects Loop trick doesn't work.
 
Clean that ribbon cable!
The pre amp can get staticy and/or intermittant if it is making poor contact.

If you don't have good speaker, you still haven't heard all it has to give.
I bridge my BX1500 into a fEARful 15/6/1.
Clear, clean punchy full range up to insane volume.

Get the two button footswitch.
You can kick in the graphic EQ for a whole different sound and go right back to
flat or whatever you had before.
I like to use the second function for the mute.
 

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