BillFitzmaurice.info

Hi there
I did my homework and the Dayton Audio RSS315HF-4 12" fit all the criterias of the cab. It is a HF subwoofer. What does that mean? is it less good that LF subwoofer? Also it has that ruber lip on the top that none of the drivers that Bill recomand has. Is it going to fit?
It is one of the rare one still in stock...

thanks you

joblow88 wrote: ↑Fri Feb 18, 2022 2:33 am Hi there
I did my homework and the Dayton Audio RSS315HF-4 12" fit all the criterias of the cab. It is a HF subwoofer. What does that mean? is it less good that LF subwoofer? Also it has that ruber lip on the top that none of the drivers that Bill recomand has. Is it going to fit?
It is one of the rare one still in stock...

thanks you

The driver has to fit within the T/S parameter specs. The best fit for the T39 is the Eminence 3012LF. I've never seen anyone use a Dayton for Pro Sound subs. The 3012LF is about the same price, is way lighter and is the right kind of driver for this application. The Lab 12 is also an option, but there's no reason to pay more for a heavier driver with no additional output.

Plus, you want to stick to an 8 ohm driver for better use of your amps.

joblow88 wrote: ↑Fri Feb 18, 2022 2:33 am I did my homework and the Dayton Audio RSS315HF-4 12" fit all the criterias of the cab.

All except that it's not a pro sound driver. From the plans, page 1: Many hi-fi drivers have compatible specs, but they tend not to be built to the durability standards of pro-sound drivers, so I don’t recommend them.

Bruce Weldy wrote: ↑Fri Feb 18, 2022 5:36 am

The driver has to fit within the T/S parameter specs. The best fit for the T39 is the Eminence 3012LF. I've never seen anyone use a Dayton for Pro Sound subs. The 3012LF is about the same price, is way lighter and is the right kind of driver for this application. The Lab 12 is also an option, but there's no reason to pay more for a heavier driver with no additional output.

Plus, you want to stick to an 8 ohm driver for better use of your amps.
[/quote]

All the driver mentioned in the plans are back ordered ordered here in canada.... So im looking for alternatives. I figured that maybe it migt work considering the lack of alternatives, the 5 years waranty and the T/S specs. Also since the power is linked to the displacement i figured that it might be louder with the Xmax of 14.3mm.

Im just trying to get my head around this bottomless rabit hole. The more i read the less i seem to know...

From what i get you guys would recomend that i wait until the get stock again?

also, why would 8 ohm be better for the amp? I was planning to connect the two cab in series on a single chanel of my RMX 4050a and do the same thing with my PA on the other channel because it is less parts to cary around and having just one amp for off the grid shows seems like a good plan. it has ample power to drive them in all impedences.

Thanks again

joblow88 wrote: ↑Fri Feb 18, 2022 11:33 am
All the driver mentioned in the plans are back ordered ordered here in canada....

Yeah, unfortunately that's the case. Eminence can't get the parts fast enough to build what's on order. Best option is to order them and get in line as a backorder. They are making production runs every day, but are having to fill orders as they were entered. So, get in line quick!

Im just trying to get my head around this bottomless rabit hole. The more i read the less i seem to know...

Don't feel bad......I had been running sound for over 35 years when I came here. I've learned tons of science and reality here, and had to forget a lot of what I thought I knew before.

From what i get you guys would recomend that i wait until the get stock again?

Absolutely. This is a time intensive project you are taking on - don't scrimp on the drivers after you've put that much time and work into it.

also, why would 8 ohm be better for the amp? I was planning to connect the two cab in series on a single chanel of my RMX 4050a and do the same thing with my PA on the other channel because it is less parts to cary around and having just one amp for off the grid shows seems like a good plan. it has ample power to drive them in all impedences.

It's not better for your amps necessarily, but puts them to better use. Running live shows with separate boxes in series is a PITA. You have to have either special cables or break out boxes to achieve it. Much easier to have every speaker cable be able to work on any speaker. 8 ohm boxes let you run two per side with only a 4 ohm load - keeping the amp running cooler and more efficient.

One thing you'll find is that these boxes are very efficient and require much less power than direct radiators. You can run on much lighter and cheaper amps. The 3012LF needs to be limited to 50-55 volts, so you could run two per side easily on the QSC, but you could most likely sell it and buy two amps that together would weight much less than the 68 pounds of that beast.....and have a twice as many channels.

I've been using Crown XLS series amps for 10 years with no failures - and they come in at about 11 pounds. There are good options from QSC also - the GX7 is a good amp (not the same as the GX3 or 5).

Eminence isn't the only choice, there's Faital Pro, B&C, Beyma and others. So long as the specs are right and its a pro sound driver you're OK.

Here ya go, man. 4 available.

https://www.ebay.com/itm/Eminence-KAPPA ... 632-2357-0

joblow88, did you check this site?
https://qcomponents.ca/products/eminenc ... 7bdb&_ss=r

Fs 49.8
Qts 0.47
5.72 Xmax
Pro Driver
In Stock
$90

Seth wrote: ↑Fri Feb 18, 2022 11:11 pm Fs 49.8
Qts 0.47
5.72 Xmax
Pro Driver
In Stock
$90

Cheap, but lousy xmax for a sub. That's gonna' limit the power you can put to 'em. I'm a proponent of putting the best driver you can in subs that balances price and output. Just doesn't make sense to have to build two of 'em to get the output of one if you'd only used a better driver to start with.

Two T39s loaded with them would give better results than one 3012LF loaded T39, and in a permanent install I'd lean towards doing that. I wouldn't with a system that I had to move from gig to gig.

Bruce Weldy wrote: ↑Sat Feb 19, 2022 9:31 am

Seth wrote: ↑Fri Feb 18, 2022 11:11 pm Fs 49.8
Qts 0.47
5.72 Xmax
Pro Driver
In Stock
$90

Cheap, but lousy xmax for a sub. That's gonna' limit the power you can put to 'em. I'm a proponent of putting the best driver you can in subs that balances price and output. Just doesn't make sense to have to build two of 'em to get the output of one if you'd only used a better driver to start with.

Gonna treat that as a Devils Advocate response (which it is) and Devils Advocate your Devils Advocate ...

Cheap, but lousy xmax for a sub.

I don't agree. "Lousy" is a judgement that's unfair in my opinion. It costs less and has more Xmax than the least expensive recommended driver in the plans. Perhaps Bill should change the recommendation to nothing less than the most you can get (or can't get, as the case seems to be)? (Playful satire. But, satire none-the-less)

I'm a proponent of putting the best driver you can in subs that balances price and output.

I am too. But, let's not ignore everything else, such as availability. The 3012LF isn't currently available. Given that, what's your choice driver? Seems ridiculous to argue in favor of an option that doesn't exist at the moment. What is the best driver you can get that balances price and output at this moment in time? Given the two, would you be in favor the (not pro audio, 4Ω) $200+ Dayton Audio RSS315HF-4 he originally mentioned, over the (pro, 8Ω) $90 PRV? Maybe a different option that hasn't been mentioned?

Just doesn't make sense to have to build two of 'em to get the output of one if you'd only used a better driver to start with.

IMO, this really, truly, honestly depends on the specific goals and requirements of the end user and their intended use. In reality, two cabs with half the power each will outperform one cab with twice the power every single time, every day of the week. If transport considerations rule out 2 cabs as an option, there's little point in considering the difference. However, if transport isn't a limiting consideration, two cabs (at roughly the same cost as one) absolutely makes more sense. Two cabs loaded with the driver I mentioned will outperform one 3012LF loaded cab.

Just doesn't make sense to have to build two of 'em to get the output of one if you'd only used a better driver to start with.

So, realistically,... out of drivers that are currently available, what would you choose and recommend?

This one: https://qcomponents.ca/products/eminenc ... 7bdb&_ss=r

Bill Fitzmaurice wrote: ↑Sat Feb 19, 2022 12:19 pm

Seth wrote: ↑Sat Feb 19, 2022 11:18 am
...So, realistically,... out of drivers that are currently available, what would you choose and recommend?

This one: https://qcomponents.ca/products/eminenc ... 7bdb&_ss=r

Bamm-O!

Scoop up all 4!

Seth wrote: ↑Sat Feb 19, 2022 11:18 am
So, realistically,... out of drivers that are currently available, what would you choose and recommend?

My recommendation was stated a few posts up in the thread. Wait until the better drivers are available. If you just have to have 'em now, then take your best shot and hope for the best - that's just not my recommendation.

Hopefully, he'll jump on the ones that Brian found.