djreverse wrote: ↑Thu Sep 26, 2019 2:02 pm
To start I have a stanton scs4dj multimedia mixer, a crown xls1500 running 2 jbl jrx115 top cabs, a qsc plx3602 running 2 jbl mp418s subs. I have everything running separately as each channel is being used per speaker/sub.
That's fine. Those JRX boxes will fart out long before the subs will if everything is set correctly.
They are pretty harsh in the top end and you aren't going to get a whole lot of volume from them and keep it clean - so, run it up until it sounds bad then back off.
Wasn't sure about amp linking so I didn't go that route because I don't want to cross anything. I have each amp connected to the driverack and out to the speakers and subs.
I assume you mean bridging when you say amp linking....not necessary with those amps.
Someone had mentioned to me on another forum about only running the qsc and subs through the driverack, and using the built in dsp from the crown by itself, and it would sound better like that but I'm also unsure about using that method.
Someone doesn't know what they are talking about. The DSP in the driverack is way more powerful and precise than the one in the Crown (I know, I have 7 of those amps). Stick with what you doing.
I don't have any clipping happening, but if I crank my master and or sliders up on the mixer I would for sure hit clip on the amps. I'm trying to get my system to where if I were to turn it up all the way, I wouldn't hurt anything, but also have good sound throughout the system. I believe I have the crossover set correctly through the driverack, but I want to protect everything while getting more sound by using the limiting. Does that make more sense? Or am I looking at this all wrong? Any help would be appreciated, as I'm not using the wizard. My setup doesn't sound bad, but I know it can be louder than what it is. I just want to protect everything the correct way.
You have all front loaded speakers and you can hear when they start hitting their limit based on how they sound. Limiting does not get you more sound - it keeps you from delivering more voltage to the speakers than you should.
First thing to consider is that rig is not going to be really loud. Those tops do not sound good when they are pushed. The horn is small and the crossover point is very high, resulting in the 15 trying to push the mids all the way up to about 3k if I remember correctly and the tiny, cost-saving driver gets really harsh very quickly. Not putting down your boxes, just telling you like it is. If sound quality is paramount, then you can't push these very hard. Your overall volume has to be determined by the weakest link, and in this case, it's the horn in the JRX.
As far as limiting - that is done with the amps turned all the way up. Send a 60Hz sine wave (test tone) through your mixer until the master output lights are hitting below the red. Then using a voltmeter on the amp outputs (no speakers attached), adjust the limiter on the dbx until your limit is achieved. For your subs, I'd say about 45 volts if you are high-passing around 40Hz. For the tops, I'd go no more than 35 volts using a 1khz tone.
You have to make sure that AFS is turned off on the driverack and that you are using the limiter and NOT the compressor. Do not use soft-knee either.
Once you achieve the voltage on the sub channel - run the fader all the way up and see if the voltage stays where you set it - if so, the go through the same process on the tops.