XTI 4000 into 2 T39's

[DJ.LJ]

I am currently in the process of building the T39's and trying to get all of my equipment together
for this project. This is the first time for me messing with amps... all of my speakers I have dealt
with were plug in play types with built in amps (JBL PRX615M's, JBL VRX918SP, QSC K12's, K8's and KSubs).

I am assuming that I can daisy chain both of them on one channel.

My question is.. what type of cable do I get?

Just a 2 conductor type or 4 or 8?

Will this fit the bill or are they too cheap?
http://cgi.ebay.com/2-25-PAIR-SPEAKON-H ... 5640a47bf8

Thanks.. LJ

[DJ.LJ]

Here is another cable I found for a good price.. I have used accucable's for DMX and seem
to work really well.

http://www.godirectmusic.com/accucable- ... 28721.html

[Lastcat]

12 ga would work. Not sure of the quality of the cables, but at least they are Speakon ends. XTI 4000 is a great choice in amps. They have DSP processing, to allow crossover, eq, limting, etc. You should download Band Manager, and using an USB Cable and computer, you will be able to control the DSP.

http://hiqnet.harmanpro.com/software/band_manager/

Using either the 25' or the 50' from one channel on the XTI, then all you would need is about 3' of cable. You could use 25' from one cabinet to the other, but you could also cut that down to 3 different 3' cables, which gives you more cables and flexibility.

I have my T39's wired with Two 2 pole speakons, and One 4 pole Speakon. I plan on running 2 per side, for a total of Four. The Channel 1 on the XTI, has a 4 pole output, that sends ch1 and ch2. That way I can run a single 12/4 cable (12ga 4 conductor) to one of the cabinets, daisy ch1, then send ch2 out to the next pair.



Hope this helps, Lastcat.

[DJ.LJ]

Ok.. that really helps. I did not know I could run both channels out from one 12/4 cable. I will have to see if
they sell a 3 speakon deep dish as I intend on doing 4 T39s eventually.

Will it hurt anything if I run the 12/4 cable into a 12/2 jack until I get the other set of T39s going?

Regards.. LJ

[Lastcat]

The 12/4 cable no problem, just build 2 "Y" cables from ch1 and ch2, for temporary use. Or just run ch1 from the 12/4, what ever fits your needs. A Speakon 4 pole cable end, will only fit into a Speakon 4 pole chassis connector. But a 2 pole cable end will fit both 2 pole and 4 pole chassis connector.

If you plan on 4 T39's, just plan what is best for you, and get the cables, connectors, speakon ends when you can. So many ways to skin a cat, no pun intended. Before I bought any parts, I spent sometime, going over all my options, past, present and future. What if I have 6 T39's? Would I be able to daisy chain? What length cables? I ended up with 12/4 at 25' for short runs, and 12/4 at 50' for medium runs, and I also picked up 2 of these:



http://www.neutrik.com/us/en/audio/210_ ... etail.aspx,

so I could extend anything I might need to 75'.

Also, if you need to build Speaker Cables, check out Sky Craft, best prices around for SJOOW, but min. buy is 100', but that was well within my reach. I also picked up some of their 12/2 SJOOW.
http://www.skycraftsurplus.com/124sjoowpowercord.aspx

Cheers
Lastcat

[BoostFab]

make sure you get the real Neutrik speakon end connectors, stay away from the generic speakon end connectors.

[SeisTres]

First off, i'll advise you to simply go with EVERYTHING as four pole speakons, jacks and cable mounts. This simplifies the whole 2/4 pole scenarios you might encounter.

And secondly, personally, i've never liked 4conductor wires. I find them that they complicate things more than they simply them and don't allow for versatility. In all of this time, my tops were in different locations than my subs. The subs are (or should be) grouped together while this is almost never the case for the tops. It might work if you're using your subs as speaker stands, but doing this is not recommended at all (read the sub placement sticky).

The way I do my set up is to use one channel and one 2conductor cable for the subs and then simply parrallel the group with 3 feet 2conductor cables. Then, for the tops, I parallel straight from the on on the second channel, so one cable goes from channel 2 to left top and another cable from teh same channel 2 to the right top. However, some people prefer to run a single cable to the left top and then run a cable from the left to the right top. But do note that is a mono setup, I never really use stereo. Since it's the single xti, I assume this will be too.

In that particular set up, I prefer to run 2 25ft cables (one for left top, one for subs) one 50ft cable (right top as amps are almost never in the middle) and one or two 3ft cables (depending if run two or three subs). And yes my 50footer is 14ga while my 25ft are 16ga to make up for the difference in length. But i guess running everything the same gauge is not bad either.

[netwerks]

First off, i'll advise you to simply go with EVERYTHING as four pole speakons, jacks and cable mounts. This simplifies the whole 2/4 pole scenarios you might encounter.

And secondly, personally, i've never liked 4conductor wires. I find them that they complicate things more than they simply them and don't allow for versatility. In all of this time, my tops were in different locations than my subs. The subs are (or should be) grouped together while this is almost never the case for the tops. It might work if you're using your subs as speaker stands, but doing this is not recommended at all (read the sub placement sticky).

The way I do my set up is to use one channel and one 2conductor cable for the subs and then simply parrallel the group with 3 feet 2conductor cables. Then, for the tops, I parallel straight from the on on the second channel, so one cable goes from channel 2 to left top and another cable from teh same channel 2 to the right top. However, some people prefer to run a single cable to the left top and then run a cable from the left to the right top. But do note that is a mono setup, I never really use stereo. Since it's the single xti, I assume this will be too.

In that particular set up, I prefer to run 2 25ft cables (one for left top, one for subs) one 50ft cable (right top as amps are almost never in the middle) and one or two 3ft cables (depending if run two or three subs). And yes my 50footer is 14ga while my 25ft are 16ga to make up for the difference in length. But i guess running everything the same gauge is not bad either.

+1 exactly how I do it. Easy peasy.

[DJ.LJ]

I never seen anyone hook up 3 subs to one channel before.. isn't it advised to go in pairs? How would the
ohms load work out for 3 - 8 ohm subs work out for that wiring config in parallel? Is that possible? If so I
would be able to hook up to 6 subs on one amp.. right?

I thought Lastcat's scenario sounded pretty good as that would be only one wire running to the sub group
then daisy off of that to 2 subs per channel at a 4-5 ohm load. That would keep the amp running cooler.

[SeisTres]

I never seen anyone hook up 3 subs to one channel before.. isn't it advised to go in pairs? How would the
ohms load work out for 3 - 8 ohm subs work out for that wiring config in parallel? Is that possible? If so I
would be able to hook up to 6 subs on one amp.. right?

I thought Lastcat's scenario sounded pretty good as that would be only one wire running to the sub group
then daisy off of that to 2 subs per channel at a 4-5 ohm load. That would keep the amp running cooler.

Just reread his post and actually noticed that he was talking about keeping the subs together. I went by the picture and was misled since I had not noticed the sizes on the smaller cable. However, my amps were usually closer to my tops than my subs were, so I still prefer the 2conductor cables.

The horn adds a little impedance to the cab, so this is the reason why I run three per channel even when all of my amps are rated for 4ohms. Do note that the xti is a 2ohm cable amp, so technically, four cabs per channel should be fine. It all depends on how much you want to push your gear. And when paralleling cabs of the same kind, you simply divide the impedance by the number of cabs to get you final impedance. (eg 10/3=3.33ohm). The reason why they're recommended to go in pairs is because usually everyone still only does 2cabs per channel which is pretty much an industry standard and amplifiers and speakers are usually run this way. The other big thing with pairing up these particular cabs is because they are horn loaded and you can vplate them to extends the horn which gets you better performance, almost like adding a third cab, but using just two.

Again, this is something I almost never do so for me it is not preferable, but it does for alot of people here. Floor space always seems to be at a premium so I would just add a third cab instead of vplating. But do note that this is coming from someone who has six of them and can choose at will if I should use 2,3,4, or 6. However, i'd be surprised if there was not enough floorspace in an event that required 2vplated 3012lf-loaded t39's. So yes, stick with pairs.

[netwerks]

I never seen anyone hook up 3 subs to one channel before.. isn't it advised to go in pairs? How would the
ohms load work out for 3 - 8 ohm subs work out for that wiring config in parallel? Is that possible? If so I
would be able to hook up to 6 subs on one amp.. right?

I thought Lastcat's scenario sounded pretty good as that would be only one wire running to the sub group
then daisy off of that to 2 subs per channel at a 4-5 ohm load. That would keep the amp running cooler.

You can safely run up to 4 T39 per channel on an XTI 4000.

[DJ.LJ]

You can safely run up to 4 T39 per channel on an XTI 4000.

So you run your 4000 like that? .. Down to 2 ohms? Does it get really hot? Maybe it is
safe as long as you don't bridge it.

[netwerks]

You can safely run up to 4 T39 per channel on an XTI 4000.

So you run your 4000 like that? .. Down to 2 ohms? Does it get really hot? Maybe it is
safe as long as you don't bridge it.

Yes it runs fine. I have not run it balls out @ 2 ohms but I haven't needed to because the cabs are so loud with so little power I don't need to turn it up very loud to fill the room.

There's no need to bridge the 4000 has more than enough headroom to run T39 to max 50v.

You can also run 2-3 tops on one ch and 4 subs on the other.

I ran a gig last night in a small gym using 4 OT 12 and 6 T39 on 2 of my XTI 4k (tops on one amp bottoms on the 2nd amp) for a charity Zumbathon and it sounded amazing.

When we started the first song people's jaws dropped, the sound was thunderous and filled the entire room. I've seen systems with 3x as much equipment that couldn't touch this rig. I had several of my friends say "I can't believe you built those 'effin speakers in your garage" and on top of it this was in a small town, I had friends texting me that lived 10 blocks away that could hear it in their garage.

I didn't do an SPL check (I should have) but there were a couple songs where I actually had to turn it down a little, not that people complained but I personally thought it was a little over the top and I've never had to turn something down and the system was still coasting before I turned it down and even before I turned it down we were nowhere near war volume.
Hope this helps.

[netwerks]

I am currently in the process of building the T39's and trying to get all of my equipment together
for this project. This is the first time for me messing with amps... all of my speakers I have dealt
with were plug in play types with built in amps (JBL PRX615M's, JBL VRX918SP, QSC K12's, K8's and KSubs).

I am assuming that I can daisy chain both of them on one channel.

My question is.. what type of cable do I get?

Just a 2 conductor type or 4 or 8?

Will this fit the bill or are they too cheap?
http://cgi.ebay.com/2-25-PAIR-SPEAKON-H ... 5640a47bf8

Thanks.. LJ

As bill would say "copper is copper"

You can buy 2 conductor 10ga speaker wire on ebay, it's very inexpensive @ 100' for under <$50 and works great. You don't need 10ga so you could go to 12 maybe even 14 ga for your runs if they're shorter...

[Lastcat]

I ran a gig last night in a small gym using 4 OT 12 and 6 T39 on 2 of my XTI 4k (tops on one amp bottoms on the 2nd amp) for a charity Zumbathon and it sounded amazing.

Yep, same as I will be doing, as far as setup and amps. Except 4 DR200's and 6 T39's, on 2 XTI 4000. Wish I was there, that must have sounded great .

Lastcat