1st post here please be gentle!

Just started up again after 20 year break !!!!!!

Have got the following kit so far:

Numark CDN22 MK4
Citronic 7.2 Mixer (6 years old never used)
IMG Stageline ST-500 Amp

The Question:
Citronic 7.2 mixer outputs 7.75 volts. Stageline ST-500 amp needs 1.3 volts to run 200 watts RMS x2 into 4 Ohms (full power rating) according to the manual

Question is, do I somehow double the mixers' output or is there a typo in the ST-500 manual? e.g. will 7.75v be enough to drive the amp at full power (or near it)

20 years ago 7.75v was an industry standard. (I used to have a Fal Ranger so I know!)

Hi and welcome.

Surely you mean 0.775V?


Looking into it.......
Amp specs

Can't find the tech specs of a Citronic CDM 7:2 anywhere, hopefully someone else will be along shortly to help.

Firstly, to DJs United.

Feel free to add your comments, opinions, past experiences etc to any of the topics on DJU either current or past.

The output of most mixers through their outputs (especially through phono/RCA connectors) is usually .(point)775millivolts, eg: about 3/4's of a volt.

Amplifiers tend to accept inputs upto 1.1~1.3 volts eg( 1100 millivolts to 1300 millivolts). So on the upside, you're safe in thinking that (on paper) you're not going to "blow" the inputs of the amplifier with the mixer outputs.

However...theres a second bit of "smallprint" as it were with mixer outputs...

Mixer outputs are normally quoted/spec'd as .775 millivolts @ 0db level.

Your mixer may have an output level meter on it, such as a line of bouncing LED's. If the meter is calibrated properly at the factory/design stage then the meter will probably show a change of colour when the output level is 0db - eg: where the green LED's change to be Amber or Red LED's. When the 0db is lit, the mixer will be sending .775mv to the amp.

However, most mixers can (if pushed) send much higher levels out to an amplifer eg: if you increase the master output, equalisation controls, channel faders, input gains etc on the mixer - you'll exceed 0db and be off into the red.

Certainly a mis-match of these outputs/inputs is nothing to be concerned about (not when they're this way around anyway). However, if you're worried that you're not quite getting as much "omph" out of the amp as you want, then it would be better to buy an equaliser or other clean in-line effect effect/enhancer which offers an amount of signal gain between mixer and amp, rather than thrashing the mixer, input levels etc.

Incidently, you mentioned above that you amp is rated at "200 watts RMS x2 into 4 Ohms (full power rating)". Are your speakers 8 ohm or 4 ohm?

Once again, Welcome to DJs United.

Thanks for the speedy replies guys.
My fault, it is of course .775v
On the impedence front, the pair of 15's I am running are 8 Ohm but I will soon add a 12" midcab wired in parallel to arrive at 4 Ohms, so using the 200 watt RMS/channel.

Surely 0.775V is the mixer output measured RMS and the amp input is peak to peak?

And 0.775 RMS = 1.1V p-p

I would take it that the mixer output is .775v RMS and assume that 1.3 v is a peak input power for the amp.

The mixer has a bank of LED's. 4 green and 3 red (first red at 0Db)

Thinking about it, the mixer (Citronic CDM 7:2 circa 1998/9) may have to be changed. Shame because it has only had about 3-4 hours use in all the time I have had it. The "layout" is too cumbersome. It is a "battle" type mixer and not one of the easiest to cue up either.

I also want 1 maybe 2 extra line inputs, over and above the main 2 channels for a minidisc deck and a Laptop.

Yes I agree, therefore plug the mixer into the amp without any problems. I've repaired the ST amps many a time and not noticed anything untoward.