Sorry I cant help you = totally lost when it comes to techie stuff

but they’res loads of peeps on here that should be able to help you out when they next post,

best wishes!!

you connect the mixer to a device what filters this low level audio output into the low (sub) and other frequencies. this provides filtered low level outputs which connect to the relevant input of each amp and then the speakers.

Behringer do a low cost graphic EQ which has a subwoofer output. if you can hold on until tomorrow I will have a closer look at the one I’ve got. this might make it way easier if you are just starting out than buying a complex crossover unit.

the one I have is a Behringer FBQ1502. if you look it up on their website the whole manual can be downloaded. I haven’t used the sub output myself as its in a home studio and I’ve already got enough sound in it but it seems to be just right for your configuration.

Although Behringer kit isn’t seen as the most robust I’d suggest putting it in a decent flightcase and treating it as gently as it can be, as when your crew has “grown out” of this and wants something else in the way of crossovers you can use it for your home setup…

What I’ve got is definitely an EQ (which is why I got it) but has a subwoofer output.

its on the back, prominently marked as such. I haven’t tried it myself but it is definitely there. I’ve not seen an EQ with one before either, but it doesn’t seem like that daft an idea for smaller rigs.

Crossover Not Required
Speaking of special low-frequency tools, all three FBQ-PRO models feature a dedicated subwoofer output with an adjustable (30 – 200 Hz) cut-off frequency. Balanced XLR Outs are provided so you can connect to power amps, or directly to your active subwoofers, without any additional hardware—just another example of how BEHRINGER saves you money.

on mine there’s EQ sliders for 20,40, 63 100 and 150 Hz so if you were using the sub out (which I don’t as it would mean another amp and I’ve got everything and this computer on one cheap UPS) you could use the EQ to attenuate these low frequencies as you wished… the configuration would most likely be to use a sub to provide a bit of extra bass to other “full range” loudspeakers which lacked the 20-100 Hz range – basically a static version of what many folk might have in their car…

my own setup is a very quick and dirty lashup of 2 x JBL control 1s and below them the CPC “Norfolk kiddy rig” “PA” speakers with the harsh piezos disconnected but the passive crossover left in, both connected to a Sony Hi Fi receiver. It certainly isn’t “top range pro audio” but I’m in a room of about 15 m^2 and works and sounds better than you would think.

@MadPsy 494578 wrote:

You’ll find if you attenuate the low frequencies nothing will come out of the sub output (unless sub out is pass-through). Like you say it’s most likely use is to bolster a full range set. In which case it’s not really a cross over 🙂

I haven’t tried it but it does appear to be a completely separate output with an adjustable low pass filter (it wouldn’t make sense for it to be anything else). From chutneyjoes description it sounds much more like what he already has is a full range set of speakers and some other subs – he lives in the same region as me (albeit at the other end more towards London) and most newer crews start off in this way.