chris226

Powerbase 3 Sensitivity

Recommended Posts

chris226    0

Given: PB3 reaches full power at 0.775v input @ at full gain.

Question: Where (approx) would I set the gain dials (as the clock points) to have a sensitivity of 1.23v (or +4dB)?

Thanks,

Chris

Share this post


Link to post
Share on other sites
Given: PB3 reaches full power at 0.775v input @ at full gain.

Question:  Where (approx) would I set the gain dials (as the clock points) to have a sensitivity of 1.23v (or +4dB)?

Thanks,

Chris

3026[/snapback]

If you look at the rear of the amplifier, you'll see a rectangular removable

panel. Behind the panel is an input sensitivity switch. You can flip the switch

to 1.4 volt, (Crown, factory defaults @ 0.775 v) which will give you the headroom needed.

I generally calibrate my PB3/CSL1400's with my MA's. So, the MA's will act

like an input level indicator for the PB3/CSL1400's If you own MAs you

can do the same.

Either way you put it, owning the manual is essential. So, you should download

the instructions in Crown's PDF section.

Best Regards,

Elliot Thompson

Share this post


Link to post
Share on other sites
DGlass    0

Elliot is correct in that there is a switch on the back of the amplifier to select the input sensitivity of the amplifier. The PB series Reference manual can be found on our web site at: http://www.crownaudio.com/gen_htm/legacy/legacamp.htm

Just a side note on gain: It has been a common misconception that the input level controls on an amplifier are gain knobs. This is probably because so many people will say “I need to turn the gain up on the system”An amplifier will have a fixed amount of gain basically set by the input sensitivity switch. The input level controls only adjust (attenuate) the amount of input drive signal that the amplifier is receiving. In other words with the input level controls turned all the way up and the amp set for .775 volts input sensitivity should the amp get a .775 volt input signal you will get full output of the amplifier. Likewise if the amp is set for 1.4 volts and the input level controls turned all the way up and the amp input gets a 1.4 volt input signal you will get full power from the amp.

Now…… if you turn the input level controls down…. Yes…. it will take a larger input signal to get to full output because the input signal is being attenuated but the gain of the amplifier hasn’t changed only the amount of signal getting to the amplifier.

Think of the input level controls as being the same thing as if you had an external level control before the amplifier (and the amp had no level controls). :)

The 1.4 volt setting is as close as you are going to get with our amps to +4 db(1.23 volts), or in most cases 0VU, from a mixer.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now