Help with PX and RCF PA

teb335

Hi,
Am looking for some advice re my pa which is as follows...

2 RCF 725A tops,2 RCF 8003AS Subs, driverack pa PX
Band plays covers rock - AC/DC etc, through Kings of Leon/Killers etc.

Attached as the specs sheets for the two speakers.
http://www.rcf.it/en_US/professional-sp ... t-7-series
http://www.rcf.it/en_US/professional-sp ... pro-series

Have done quite a bit of reading of the posts on here, which are very helpful, but i'm still a bit puzzled on best way forward to get the best out of the equipment.

** Gain structure - think im clear on this, though havent done it in anger yet...waiting for mrs to go out to have a good blast.
** Xover - based on the specs of the speakers, was wondering what maybe a good start point for the xover frequency ?
** EQ - Have had a try of the auto eq - however did this in a room of house (Not practical to take gear outside this time of year in northern England) - as far as i can see from the specs of the speaker the results were not that suprising - ie big cut at 75h big boost at around 50 and a few other minor ups/downs. Felt rather pleased with myself...then last night i read some more on the forum and understand that doing the auto EQ in a room is not the way to go, found the post on the new indoor method but cant find anything on how to apply to a top/sub combination.
So am wondering wether to abandon the auto eq and simply apply one or two PEQ settings to try and flatten the sub with a 75 cut and 50 boost - does this make sense or am i missing something ? and if it does make sense and guidence on what would be good Q and +/- db to start with.
Finally on the EQ adjustments, assuming I end up (one way or another, with quite a boost at say 50hz level on the subs, am i right in thinking that as long as i then have the gain structure re set properly I will not damage the sub or is that a risk of boosting the lower frequencies ?

Thanks in advance

Gadget

Hi,
Sorry for the delay...saw this yesterday but was too busy till now.

I would start with the sub and let it provide the HPF...this would mean once you have your setup extend/drag the HPF to below that of the subs HPF.

So then it goes like this...
In the wizard:
Select your equipment from the menu if it's there.. if not select "custom" it really makes no difference except.. if the manufacturer of the speakers provided a crossover point, and the equipment is in the menu then select it.

Load the preset...

press the preset button and look at the HPF of the sub, the LPF of the sub and the HPF of the tops. If your speakers were in the menu then there should already be a set of filters and crossover points provided.. If not:

Select the sub HPF and set it @ 30hz BW18
Select the sub LPF and set it @ 100hz LR24
Select the tops HPF (there is no LPF on the high outs on the PX and DRPA+) and set that the same as the sub 100hz LR24

then last night i read some more on the forum and understand that doing the auto EQ in a room is not the way to go, found the post on the new indoor method but cant find anything on how to apply to a top/sub combination

When you have a subs tops config and your doing the indoor method the subs will not auto eq well... because of standing waves and modes, that is only a few frequencies anyway.. so do those by ear

*note* there is usually (in front loaded subs) a peak @ about 60 hz and another @ about 100hz and represent the high efficiency points for the design... I recommend a PEQ at these locations.. if you download the GUI available in the download section when you click the TECH SUPPORT link you can get a visual representation of what you are doing with the PEQ's and other functions like shelves and filters and such. It's not the PX but it does pretty much the same thing...

Try setting up a bell PEQ with a Q of around 4-5 and a cut of about 7-8 dB you then move that around till you get a null (low volume)in the BOOM department ... then adjust the Q till it's not affecting more of the spectrum than necessary...now adjust the gain till you are only removing the stuff that is louder than the rest of the bass around it...Same with the 100 hz freq and don't worry about the 100hz crossover ...there is significant info above the crossover point.

assuming I end up (one way or another, with quite a boost at say 50hz level on the subs, am i right in thinking that as long as i then have the gain structure re set properly I will not damage the sub or is that a risk of boosting the lower frequencies ?

Be aware that if you end up with a big boost @ 50hz the available power will be reduced for the less efficient LF frequencies. That is to say, the more low LF you add it will take more of the power away form the overall product.. and with only 1000 watts the more extreme LF you add the less overall volume you will have for the WHOLE sub..

Gadget

teb335

Hi Gadget - thanks very much for taking the time to do such a detailed response - really appreciated - will have a run thru' all recommendations tomorrow.

Thanks again