Wharfedale Pro PA, parallel, series . What does this mean?

0:01 Parallel and series

Right guys, that tune there is by Danny J. Lewis, it's entitled Red Light and this video is a bit random. It's on about parallel series, ohms, bass cabs, mid-top, amplifiers, crossovers, what else? How do you make a stereo amp into a mono amp? Right, let's have a look. Now first of all, let's have a look at parallel and series. One of my wacky drawings here, there it is. Right now let's imagine, I didn't put that actually did I? That's 8 ohm and that one is 8 ohm. There. Right, let's imagine we've got two 8 ohm speakers and we've got them connected parallel, in parallel. They'll end up going to 4 ohms. So how do we get it? Well, what happens, if you can see the positive there is connected to the positive there.

So really what we could do, instead of it going there, there, it could go directly over to there and this one, the negative, directly over to the negative here. So that is positive and that one is negative and that is parallel. On the other hand, we could do something like this. So for example, this is an 8 ohm speaker. We're going positive to the positive terminal. From the negative terminal of the first speaker to the positive and then at the negative to the negative. So that's 16 ohms so it's doubling. So 4 ohms and 4 ohms, that's going to be 8. 2 and 2, that's going to be 4. Right, that guy there is a bit of a monster. It's from a company called Wharfdale. It's a twin sub-18. A few little things I will explain about this guy here.

2:46 This bass cab

We've got mid on top on there as well. Now, if you have a look at the back first of all. All right, delta 15 and we've got in and through. What the heck does that mean? Well, this cab here is 8 ohms. Now, if I just use an amplifier into this, I will be pushing or putting into that amp an 8 ohm load. But if I go from this guy into another 8 ohm speaker, I will get 4 ohms. That's because that speaker is connected or I would have connected the two speakers in parallel. That's what I will get. Now, most of the time, DJs will have their speakers connected in parallel. Let's have a look at this bass cab here. Right, delta 218b short for 2 18 inch bass. Now we can do parallel or we can also do something called discrete.

Simply means this. Now when if you have a look there, you're on parallel, you are using a 4 ohm or you'll be running at a 4 ohm load. When you're doing discrete, what's happening is this guy here is a speak-on and there's four connections on this. There's plus 1 and minus 1, plus 2 and minus 2. So when you want discrete, you'll actually only be running one of the 18s if you've just got two cables in here. If on the other hand, you've got four cables in here and you run it discrete, so you've got plus minus on 1 and 2, plus minus on, sorry, plus minus on plus 1 and minus 1 and then also plus minus on plus 2 and minus 2. Then you will be running the two speakers. So you would need four cables in here. It does get a little bit complicated

But the easiest way to run this guy is just parallel. Alright, let's have a look at the amps and how they're wired in. And how do we get a stereo amp into mono? Well this is known as a power amp. It's the Wharfedale Pro PM2800, 2800 and I've got one of the bass cabs into channel A, one of the bass cabs into channel B because this amp will run a 4 ohm load perfectly. So four ohms, one bass cab, two 18s there, four ohms, one bass cab in there. What I can do here, I can run two of the 15s in this guy and two of the 15s in this guy. So two 15s in one channel, two 15s in the other. So I'll go out of this one side at the back into one of the 15s out of that 15 into the other 15 out of the back on this side into one of the 15s

5:26 I hope you've got that sorted

Out of that 15 into the other one. Right, so I hope you've got that sorted. Now if we have... I'm going to try and do this now. Have a look at the back. This is going to be a bit of a little bit but very heavy. Right. Can we see input? You can just about see it there I believe. I hope so anyway. If you can't, tough. Input. And also we've got input there for jack as well. Now notice we've got input XLR, sorry and jack on the one side XLR and jack on the other. So how do we make a stereo amp into a mono amp? Now let's imagine we were just having this for the right hand side. What I could do I could go from the crossover from the mixer into here like so and then what I could do I could go out of this side because it's the same side so I could go jack out

From here into XLR here. So what I'm doing is I'm using the same signal from the one side into the other side of the amp so out of the mixer or out of the crossover into this side of the amp and then just all that's happening is going from there to there from here from my cable that I plugged into here into this side and then I can use that amp as a mono amp so if I wanted to I could use this just let's say for the right side and that let's say just for the left side gets slightly more complicated because then if I just use that for the right side and I was using 15 inch speakers then I could actually have four 15 inch speakers for one side and four 15 inch speakers for the other side alternatively I could have two twin 18 inch 4 ohm subs

8:03 Left, turn bass, point middle

For the one side and two twin 12 inch subs for the other side if I had this guy as well exactly the same as this one right so that's been a help now what I'm going to do is I'm now going to move this around come here with me get it that's heavy right what I'm going to do I'm just going to turn that up to number five there that's my base and I'm going to have that set to number two no in fact I'm going to turn that up to number seven two and a half why I'll show you right let's go back over here now now let's go and check out Mr Danny J that's Blaze bless him right turn that down now it's very difficult for you to hear that but what we've got is what we've got a beautiful bass sound with a very tiny little minimalistic kind of mid and top now that's the sort of sound

That you would hear when you turn the bass sweet on the mid and top and as I turn that up the bass will increase at the same intensity as the mid and top but you'll get more emphasis on the bass because there's more power being pushed out by the amps you'll notice as well that I've got the bass cabs either side of the room one there or one there and you'll notice you will get better bass response also let's imagine that it's the right side and that's the left side now you'll notice there I've got another mid top cab and I've got another one over there now alright let's say that is the right and that's the left do you think then if that was left and left no what I would do I would go out of that speaker and then I would go all the way across into that speaker so that one

Would be left and I'd go out of that one all the way over to that one and left if I go here to this point I would be in the middle of left and right if I go to this point here I'm now in the middle of right and left and if I go here I'm now in the middle of left and right in other words by doing it that way wherever I am in the room there's no sound all right now I hope that's been a help the tune is by Danny J Lewis it's entitled Red Light and all I'll say is practice and enjoy your parallel and series thank you

This transcript was produced automatically from the audio of the video and may contain mistakes.