DriverackPX Powered Tops PRX515 with passive Subs

desiBel

Hi guys,

Can anyone help?

I'm a novice to complex pro audio; however, I have worked with basic PA setups for a number of years!

I have:
1 Studiomaster Powered Mixer (Horizon)
x2 JBL PRX 515 Tops (Active)
1 Studiomaster 1600D Amplifier
x2 Precision Device Subs (Passive)

I know this may sound silly, but as it stands I am unaware of how to link up my non-powered subs to the Driverack PX my mixer only has the two left/Right line outputs which are conneted to the left/right tops (JBL PRX 515).

Now, I am a bit perplexed as to how to take a line out from my mixer to the amplifier, to the subs and have two-way sound???

Ps. Life was simpler using two JBL Eon15 tops (passive) through my powered mixer and using the built in crossover and taking a line out to an amp for the subs.

Would appreciate any advice?

Gadget

First off let me introduce you to one of the most helpful parts of this site, THE READ ME FIRST BEFORE POSTING SECTION section...
http://www.dbxpro.com/forum/viewforum.php?f=62
http://www.dbxpro.com/forum/viewforum.php?f=61
http://www.dbxpro.com/forum/viewforum.php?f=60

Now...the filter set is the same as the DRPA.. 260 even 480 and 4800...

When we use a fullrange speaker we use a bandpass filter, with an HPF and possibly an HPF...when we add subs, or bi-amp, we then us a crossover... a crossover is like 2 bandpass filters (or three.. or 4 as in a bi-amp top and subs or tri-amp tops with subs)

Now without knowing what SPECIFICALLY your subs are... it's pretty hard to nail down a setup... but I'd start with:
HPF 40hz BW18
LPF 100 hz LR24
that's the sub...
tops:
HPF 100 hz LR24
this would be a 2X4 setup, or a 2X3 with mono sub in the PX...

So, out from mixer to ins on PX hi outs from PX to 515's low outs to amp and then subs...
G

desiBel

Hi Gadget,

Thanks for your reply. I have tried to read alot and there is so much to learn, one thing leads to another!

I now understand the basic connections, as you so kindly explained however, still need to read up on a few things you mentioned about the sub settings.

I don't want to get on anyone's last nerve and so I'm trying my best to take it all in.

I have the specs for my Subs, they are 18\" Precision Device Subs (Company in England, also produce the old Fane brand name).

18\" PD Subs - Nominal Diameter 46 cm (18�)
Power rating 1 600 Watts
Frequency range 40 to 3 kHz
Nominal Impedance 8 Ohms
Sensitivity 2 (1 W 1 M) 98 dB
Resonance 40 Hz
Enc.Vol. Recommended 80 to 350 Litres
Displacement limit 14 mm (0.55�)
Voice coil diameter 101 mm (4.0�)
Voice coil Copper
Voice coil winding depth 19 mm (0.75�)
Suspension (Spider) Dual Fabric
Magnet gap depth 11 mm (0.43�)
Magnet material/mass Ceramic/2.6 Kg (95 oz.)
Magnetic assembly total mass 7.8 Kg (17.24 Lbs.)
Flux Density 10,500 Gauss
Cone type/material Paper
Surround Fabric
Dust dome Paper
Connectors Spring loaded push button
Polarity Positive Voltage on Red Terminal gives forward cone motion
Notes
1. AES Standard (50 to 500 Hz) Program 1200 Watts
2. AES Recommended Practice.THIELE - SMALL PARAMETERS
RESPONSE & IMPEDANCE
DETAIL
Response measured in a half space environment.
MECHANICAL DATA
Fs 34.98 Hz
L1 1.26 mH
Revc 5.73 Ohms
L2 2.83 mH
Res 110.47 Ohms
RMSE-load 2.92 Ohms
Qts 0.28
RMSE-free 2.60 Ohms
Qms 5.78
Vas 419.98 Litres
Qes 0.30
Mms 103.98 grams
Sd 1225.42 sq cm
Cms 199 µM/N
R2 8.85 Ohms
BL 20.90 T/m
Notes
3. Thiele - Small Parameters follow a 600 Watt preconditioning period.

They will be powered by a Studiomaster Amp 1200Watts
(don't have full specs)

I haven't tried to hook it all up yet tho.

I have run my mains (JBL PRX515) with the DR-PX alone in my lounge and they sound good.

Will post back when I've done more research on this site.

Thanks again.

desiBel

Oh just one more thing to clarify?

I read on another post 'PA v PX' that one can only have either a 2x2 or 2x4 setup.

I understand this to be either a 2 top 2 sub setup or a 2 top 4 sub setup.

Does this mean I can't have a mono sub setup 2 tops 1 sub?

Thanks,

Tony

Dra

2 x 2 = Full range stereo (2) in and full range stereo (2) out.
2 x 4 = Full range stereo (2) in and stereo highs (2) & stereo lows (2) out. (4 total outputs)

If you only have 1 sub, select mono sub when setting up the configuration wizard. That should be in the manual.


DRA