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Hi guys,

What's the best way to get a subwoofer output from my mixer?

The only low-pass filter references in the user's manual are related to the effects.Would I be better off using one of these effects with all the parameters BUT the LPF zeroed out, or would it be better to use an Aux Mix with EQ applied?

Of course, I'd want to apply a high-pass filter on the mains, too. That seems a bit more straightforward.

Please explain it like I'm 5 years old. Okay, maybe not 5; how about 15?

Thanks a million!

Brad
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by wahlerstudios on Fri May 17, 2019 5:25 am
The Series III mixers have a physical Mono output, but it's only the new StudioLive 64S which is really using it (LCR, LPF). For all other SL consoles it's just a summed signal of PA left/right, which is muscially more or less useless. The Low Pass Filters in the FX machines are there to "shape" the sound of a particular effect, not the general sound or controlling subwoofers. The FX machines anyway have no physical output, unless you route/send them to a fixed subgroup or a flex mix.

There are simply no Low Pass Filters available on the 32-channel Series III mixers and the rack mixers. Already for some years, being able to use LPFs and HPFs on the inputs and outputs has been one of the highest voted feature requests, which the PreSonus engineers study thoroughly every day, as we all know.

You are not describing which kind of subwoofer or subwoofer system you are using. Mono subs are an option, but not a must. Do the subwoofer/s see the whole music program, just reduced in freqency range, or do you want to send selected instruments to the subwoofers? In this case "Aux Subs" are a good concept. Link two auxes (9+10 for example, the last two on your SL16), rise the faders (kick, toms, bass, tuba, alpine horn...) and the aux master and - in the aux master - adjust the parametric equalizer to your taste. Depending on the loudspeaker/s you are using, sometimes it doesn't need a lot of frequency manipulation. If the speaker range ends at 400 Hz, it can not transmit higher frequencies, hence you don't need to "eliminate" higher frequencies.

You can also route two of the graphic equalizers to aux 9+10 for frequency adjustments. Together with the 6-band parametric equalizer there should be enough possibilities to manipulate the sound of your subwoofer/s. This is not the professional way of dealing with this subject, but it works... Always better is a active external x-over or controller.

SL16 | 32R | 16M

Apple routers | iPads | PreSonus SW5E & Motu AVB switches | Alesis iO Dock with AudioTools' Smaart RTA & Spectograph extension |
Yamaha S112, S15e, S10e, SM12, SM10 | Galaxy Audio Hot Spots | Mac mini | Lenovo Laptop | Studio One Pro 3.5.6
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by bradwaite on Fri May 17, 2019 8:56 am
Thanks for the response, Hans-Martin.

Based on the manual and forum, I wasn't expecting a separate mono output with a true LPF on my older SL16.

And of course, the FX weren't designed as LPFs, but I was thinking of them as a workaround, routed as you mention, to a flex mix.

This is a smaller church auditorium (250-seat) with a single JBL CBT70J main speaker and JBL SRX828S passive sub, both mono. I was expecting to send the whole program below ~80Hz to the sub. And while sending the full-range audio to the sub would work, it's by no means ideal for the sub, the mains, the amps, or the listeners.

Yes, an outboard crossover is ideal, and is what we're using right now. But I'd like to see how well it works using the mixer.

I'm not sitting in front of it right now, and the routing/Fat Channel adjustments would probably be more obvious if I were.

I'll report back after I've had a chance to toy with it, but if anyone has any other suggestions, I'm all ears.
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by wahlerstudios on Fri May 17, 2019 9:20 am
Interesting... Who has recommended using these loudspeakers? This combination does not fit together at all! Honestly, I would say, forget this mono bass thing. Do something on your PA. 250 pax is not much. My two aged S112IV would easily make that job, even with a full band.

Just my 2 Euro cents.

;-)

SL16 | 32R | 16M

Apple routers | iPads | PreSonus SW5E & Motu AVB switches | Alesis iO Dock with AudioTools' Smaart RTA & Spectograph extension |
Yamaha S112, S15e, S10e, SM12, SM10 | Galaxy Audio Hot Spots | Mac mini | Lenovo Laptop | Studio One Pro 3.5.6
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by bradwaite on Fri May 17, 2019 3:41 pm
Why don't you feel that these speakers work well together?

And why forget the mono bass thing? Bass is omni-directional to human ears, so other than filling in for room modes, I don't see the advantage of multiple subs.
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by wahlerstudios on Fri May 17, 2019 4:15 pm
The JBL CBT70J "Column Speaker" belongs to the wall-mountable series of loudspeakers for fixed installations, which is used primarily for spoken word. It has 16x 1" speakers and 4x 5" speakers. There is no bass cabinet available in this series. If there was one, it would probably be a 10" speaker.

The JBL SRX828S is a 2x 18" subwoofer, which is completed by a JBL SRX815 (15" speaker + 1.5" horn) or a JBL SRX835P (15" + 6" speaker and 1.5" horn). There is also a JBL SRX812 (12" + 1.5"), which can be used as monitor, front or satellite system. Together with a JBL SRX818S (1x 18") this is the "JBL SRX800 Passive Series of PA loudspeakers for touring".

The SRX speakers were built for live music and they are much more powerful than anything which is "wall-mountable". If you would add one or two JBL SRX812P to your subwoofer, you would hear the difference right away. You need to use the same type / family of speakers. It makes no sense to look for a solution for your bass system while the top speaker is the problem...

SL16 | 32R | 16M

Apple routers | iPads | PreSonus SW5E & Motu AVB switches | Alesis iO Dock with AudioTools' Smaart RTA & Spectograph extension |
Yamaha S112, S15e, S10e, SM12, SM10 | Galaxy Audio Hot Spots | Mac mini | Lenovo Laptop | Studio One Pro 3.5.6

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