Karaoke Forums

When using a SUB with an internal crosser ( ie Peavey PR SUB)

You input your full signal into the SUB and then out to your mains.
The internal crossover should make sure the right freq go to the right speaker?

What happens to the power amp -- If I input 500w @ 4 ohms into the 8ohm sub and then connect the 8ohm main - Is this the same as hooking up 2 8ohm mains in parrallel????

Well a couple things Jam. The inputs on the PR Sub are parallel inputs so if you connect another 8ohm load your amp is going to see a 4 ohm load. However, I think you're mistaken about how that crossover works. The crossover does not affect the signal going out to the next speaker if you use the parallel connectors. Since they are parallel, it will be a full range signal going to your top cabinet if you hook it up as you've described.

Typically powered sub-woofers provide and internal active crossover and then have a High-Pass output for daisy-chaining to your top-end cabinets. I'm not sure of any passive speaker cabinet I've seen that provides this type of cross-over for speaker level signals.

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DJ Tony
Let It Rip Karaoke

Nope.

I own the PR-Sub and use it with PR-10s. But I have to send a signal into a crossover, in my case a Driverack PA, and that sends the signals to separate amp channels which I then send to the PR-Sub and PR-10s.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

MCKY

Since you havethe PR SUB ...is it any good ?

What I'm thinkin is this -- I've been using my new PR15 for an outside patio type gig
I have 2 areas to get music to --the actual patio and then the covered bar area
The covered bar area they want the music a little QUIETER if you know what I mean .

I want to run 1 pr15 off 1 side of my Yamaha Powered Mixer emx512 ( monitor) and the other PR15 and the PR SUB (mains) for the main patio ..will that work well with no extrenal crossover (just the internal) ???

Now the areas are connected and the setups on opposite sides so the music will bleed into each others area giving me good coverage ..I just don't need the added bass "undercover"

There isn't really any point in running a PR-Sub with PR-15s -- it is pretty much a PR-15 without a tweeter.

Also it does not have a crossover -- I use it with PR-10s and an active crossover (Driverack PA). It works well for karaoke in a small venue. It isn't enough for a DJ gig.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Direct from the Peavey PR-Sub product description: "It is simple to use, just connect your full-range signal and its internal crossover does the rest." Acording to the rear panel of the sub, it's crossed over at 140Hz (kinda high for a low-pass filter on a sub but whatever).

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DJ Tony
Let It Rip Karaoke

Yeah I read the same thing that it had an internal crossover--but from what you guys are saying ---"probably" not worth the effort to run with the 15" I won't see any real added bass benefits?

Well here's the deal, as mcky said, the PR-Sub has the same woofer as the PR-15, it just doesn't have a horn and they add the low-pass filter (crossover) to ensure it's only working at 140Hz and below. As a result, it isn't going to add any frequency reproduction that you aren't getting out of your PR-15's already. However this doesn't mean there is no benefit.

If you added the PR-Sub to your system you could do it one of two ways discussed here. First, if you add the sub and still have full range going to the PR-15's you have one more speaker adding additional low end. While it won't give you anything below what the PR-15's already do, it's going to give additional response in the 45-140Hz range. So if you feel you're PR-15's aren't giving you enough bass in this area, that would add some additional.

The second way you could do it is with an external cross-over so that you send high-pass signal to the top cabinets and sub-low to the PR-Sub. Again, not going to get you any lower, but what it can do is help clean-up the clarity of your PR-15's. By not asking the woofer on the PR-15's to reproduce everything from sub-low up to mid-range can help keep your voice coils cooler and improve the response as the program material nears the cross-over point (between the woofer and horn in the PR-15 cab).

Now would either of these be noticeable. The first option would be, but maybe not for the better. Without hearing your rig, I can't say if this is what you need or not. The second option is more debatable as to how noticeable it is, but this is why they build 3-way cabinets. You'd be basically building your own 3-way system.

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DJ Tony
Let It Rip Karaoke

THANK YOU !!

I guess I was under the initial impression that the pR SUB would be producing low lows and the crossover (internal) would clean up the 15" on the main.

I'll probaly going to just keep the 15" going for what they are a great liteweight speaker. This current patio type gig does not require real thumping bass per se'

on a side note I was told I would be moved INSIDE for the winter. I know they have a house system with flying speakers that they use for CLUB MUSIC on FRIDAY AND SATURDAY nights...once I get to look at the set up --I'll post more and see if its a good set up for live vocals

Thanks Again to All responders

It has a crossover in the sense that it won't use the power from the higher-freq signal. But it doesn't have a high-pass out.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Yes to be technically correct, it's not a cross-over but rather a low-pass filter.

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DJ Tony
Let It Rip Karaoke

Why does my subwoofer start soundin bad when I try to turn up it up from my headunit? I have a Pyramid 450w amp, a Pyramid crossover unit, Alpine headunit, and a 1200w 600rms Boss subwoofer. At low volumes it sounds real good and hits. But when i try to turn up the subwoofer setting or just volume on my headunit, it starts soundin bad and makin a poppin, crackling sound when it suppose to hit but sounds ok when just holding out a note. I know its not blown though. So what could be the problem?
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Could be you are asking about a car stereo issue in a karaoke forum?
That being said as a former car stereo installer, Pyramid was never a great brand, could be part of the problem. You are cracking when it's turned up, turn the bass down, obviously it cannot handle it.

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