Crown XLS2500

jgpeacock

I've recently purchased a pair of Crown XLS2500 amps to use with 2ea Yamaha 115V Mains and 2ea Yamaha SW118V. I have a DriveRack PA+ for processing and will be running this in a stereo configuration. I see that the manual has tunings for the speakers, but not the Crown amps. Would anyone be able to offer information about the tuning for these amps. Is there a comparable model of Crown amp in the tunings I could use?

Thanks. 8)

Kennk

Just use the custom setting for the setup and follow the instructions for setting the Gian structure for your system in the manual, or read the very first post at the very top of the page . There is a wealth of information in this forum . You just have to sift through it . I just used my PA for the very first time with the PA+. I did a gain structure setting at home before the show . Did not have time to do the auto EQ or any thing just used wizard for the initial setup . The EQ settings was pretty flat right off the bat . All it took was a little gain adjustment in the crossover section to balance out the levels and all was OK . I will do the auto level and EQ the next time I do a outdoor show . This is my first PA and I am not a sound guy but have a good ear . and it sounded very good for the first setup . Good luck with yours . Ken

Dra

viewtopic.php?f=61&t=959

DRA

Gadget

viewtopic.php?f=60&t=1340

Here is an post I found on the net and re-posted here without ANY permission WHATSOEVER... but then there wasn't a name to put with it

Just how far do we have to turn up the volume to get maximum output power from our amplifier?

Look at your amplifier's manual and find the sensitivity value for the input you are using. The value it gives is the input voltage required in order to produce maximum rated power when the volume control is set to maximum. If the input signal you are feeding to the amplifier is greater than the sensitivity value, then maximum output power will be produced before full volume on the control.

Let's work through a real example to make things easier to follow (using data for my Pioneer SX-1250 receiver and Marantz CD-65SE CD player - typical of many vintage amp / modern CD player combinations) :

Input sensitivity of SX-1250 "Aux" (and "Tape") inputs : 150mV
Output voltage from CD-65SE at maximum signal level : 2000mV (2V)
So the CD player output signal is 20 * log(2000 / 150) = +22dB higher than that required for full output power from the SX-1250.

What this means is that the receiver's full power of 160 watts will be produced with the volume control set to -22dB (referenced to maximum = 0dB). Fortunately, in common with much high-end equipment, the SX-1250 has a volume control marked in -dB, making it easy to see where this occurs.

Perhaps the most "surprising" thing to come out of this calculation is just how little the volume needs to be turned up to get full output : -22dB on the SX-1250 corresponds to somewhere between the 11 and 12 o'clock positions.

So the next time someone tells you how loud their system is even at low "volume" settings (and implying that it would be ten times louder if turned up fully), just pause for a minute before you get too impressed and instead consider if they may have an amplifier/source sensitivity "mis-match"

G