power amp to 8x10

[sykes of christ]

I'm getting a great deal on an Ampeg 810. My current amp is a crest ca9.

It can run at 2000 watts bridged at 4 ohms, the cab is rated at 800 rms at 4 ohms, would any of you run it bridged?

Or should I just go stereo?

[otis_thick]

Originally Posted by sykes of christ

I'm getting a great deal on an Ampeg 810. My current amp is a crest ca9.

It can run at 2000 watts bridged at 4 ohms, the cab is rated at 800 rms at 4 ohms, would any of you run it bridged?

Or should I just go stereo?

Run stereo with a limiter b4 input!!! The amp manual says 900watts @ 4ohm Even if you run quietly bridged and there is a glitch in the signal (bad cable or unplugging b4 turning down etc) a momentary 2000w peak could fry the cabinet!! This is a case of "balls too big for underwear" good luck!!

[sykes of christ]

What is a limiter?

[sykes of christ]

What is a good limiter?*

[BassmanPaul]

As the CA9 gives 900W@4Ω per channel I'd just run the cabinet from one channel. It's really is pointless, in my mind, to give a cabinet so much more than it can make use of. Using one channel will allow you to use the second channel for other things.

[sykes of christ]

I know the cab is seperate, you can run it as 2 seperate 410's at 8 ohms or run both in mono at 4. If I ran the power amp in stereo with one 410 going to the right side of the power amp the other 410 going to the left side of the power amp.

Would the power amp be running at 8 ohms stereo?

[BassmanPaul]

Yes the amp would be at 8Ω in stereo for 600W per channel or 1200W total. My comment still applies. Too much amp for the cabinet. You must remember that cabinet wattages are usually the drivers thermal limit. That's the spot where the voice coils melt. Usable wattage is something around half that.

[sykes of christ]

I'll listen to you, Paul. I'm not sure if you're familiar with the power amp I have, but to take it out of bridged mode is a real pain in the ass.

[BassmanPaul]

Until recently I have been using a pre/power rig since the Sixties. I am familiar with the CA9 but not the little details of how it's configured. They vary from manufacturer to manufacturer.

Edit: I have never felt the need to bridge any of my power amps. I've always run them in parallel with one cab per channel.

[otis_thick]

Originally Posted by BassmanPaul

Until recently I have been using a pre/power rig since the Sixties. I am familiar with the CA9 but not the little details of how it's configured. They vary from manufacturer to manufacturer.

Edit: I have never felt the need to bridge any of my power amps. I've always run them in parallel with one cab per channel.

Here guys
http://www.crestaudio.com/assets/lit...A9-AB_7719.pdf

Some power amps always run the output at full while the volume regulates the incoming signal. That's why it is very important not to over load the cabinet!! Its a very good amp
but IT CAN KILL if not used properly!!!

[sykes of christ]

Originally Posted by otis_thick

Here guys
http://www.crestaudio.com/assets/lit...A9-AB_7719.pdf

Some power amps always run the output at full while the volume regulates the incoming signal. That's why it is very important not to over load the cabinet!! Its a very good amp
but IT CAN KILL if not used properly!!!

I'm not sure as to what you're saying? I'm familiar with the manual.

[ulrich]

Originally Posted by sykes of christ

I'm not sure as to what you're saying? I'm familiar with the manual.

Basically: the volume control doesn't control volume. It's actually an input sensitivity control. Even with the gain set low, a hot enough signal, can drive the amp to full volume.

[sykes of christ]

Oh... I'm aware of that. Thanks for the help.

[projectMalamute]

Originally Posted by sykes of christ

I'll listen to you, Paul. I'm not sure if you're familiar with the power amp I have, but to take it out of bridged mode is a real pain in the ass.

How so?

On mine you just flip the switch.

[BurningSkies]

Er, a quick look at the manual suggests that it should be quick and easy to go from bridged to regular usage?

[sykes of christ]

Originally Posted by projectMalamute

How so?

On mine you just flip the switch.

So you have a crest ca9? Have you flipped the switch? I tried to flip the switch after I got mine, thats what the seller told me I had to do. But there isn't a switch, you have to open the power amp and search for a tiny jumper, when you find the jumper you need to get a needle nose pliers and hope you don't drop the tiny jumper in the amp somewhere.

[somegeezer]

Online manual says it's a simple switch on the back.

[BurningSkies]

Originally Posted by somegeezer

Online manual says it's a simple switch on the back.

The picture supports this:



I know there are two versions, one with speakons, one with individual posts, but the manual shows both with switches.

[projectMalamute]

Originally Posted by sykes of christ

So you have a crest ca9? Have you flipped the switch? I tried to flip the switch after I got mine, thats what the seller told me I had to do. But there isn't a switch, you have to open the power amp and search for a tiny jumper, when you find the jumper you need to get a needle nose pliers and hope you don't drop the tiny jumper in the amp somewhere.

I have no idea what you have there, but the three CA9's I own and the half a dozen or so I've used are all set up the same way.

The only internal jumper I've seen is the sensitivity adjustment. Ground lift and bridge/parallel/stereo switches are on the back of the unit.

[projectMalamute]

Originally Posted by BurningSkies

The picture supports this:



I know there are two versions, one with speakons, one with individual posts, but the manual shows both with switches.

That's what every CA9 I've ever seen looks like.