BillFitzmaurice.info

Try this to see if there is a pair of 12s with the right specs that equal or beat the 3015LF Vd, which would require 8mm xmax. http://www.loudspeakerdatabase.com/

Bill Fitzmaurice wrote: ↑Tue Jun 06, 2023 10:18 am Try this to see if there is a pair of 12s with the right specs that equal or beat the 3015LF Vd, which would require 8mm xmax. http://www.loudspeakerdatabase.com/

Is that something new? What a great tool.

Bruce Weldy wrote: ↑Tue Jun 06, 2023 11:09 am

Bill Fitzmaurice wrote: ↑Tue Jun 06, 2023 10:18 am Try this to see if there is a pair of 12s with the right specs that equal or beat the 3015LF Vd, which would require 8mm xmax. http://www.loudspeakerdatabase.com/

Is that something new? What a great tool.

Right? I've been wishing PartsExpress had search functions like that for ages.

It took me two minutes to find the 3012LF and these:
http://www.loudspeakerdatabase.com/Beyma/SM-212
http://www.loudspeakerdatabase.com/Oberton/12B45V

As a side note, part of the goal, if he chooses the dual 12" route, is to find two 12" drivers that cost about the same as one 3015LF.

I'm not sure how tax and shipping works over there but I've found the Fountek FW322 4ohm driver on UK sites between 119€ and 146€

I ran a pair of Fountek FW322 4ohm drivers in parallel in my not-exactly-right 30" T48 hornresp model against a single 3015LF, both on 35 volts and this was the result...


Thoughts?

I wouldn't go down the 2 ohm road.

Bill Fitzmaurice wrote: ↑Tue Jun 06, 2023 12:44 pm I wouldn't go down the 2 ohm road.

The 12v automotive amplifier he has is rated for a 1 ohm load. And if he ever wanted to run it from a standard mains powered amplifier, he could simply rewire them in series for an 8Ω load.

Additionally, in my Hornresp model of the T48 (admittedly, probably not exactly right) that driver is at it's 10mm Xmax right at 35Hz and 35 volts, so it's a good match to the amp's capabilities and a 40Hz highpass engaged.

Seems to make a lot of sense. No?

Mishkin wrote: ↑Sat Jun 03, 2023 5:33 pm this Emphaser amp (I've heard good things about them) promises 1 x 600 W RMS at 4ohms.
https://www.emphaser.com/products/monol ... 1/?lang=en

That amplifier has specs that are essentially the same as what you already have.

Seth wrote: ↑Tue Jun 06, 2023 2:03 pm

Mishkin wrote: ↑Sat Jun 03, 2023 5:33 pm this Emphaser amp (I've heard good things about them) promises 1 x 600 W RMS at 4ohms.
https://www.emphaser.com/products/monol ... 1/?lang=en

That amplifier has specs that are essentially the same as what you already have.

Are you sure about that Seth. The stated watts at 4ohms are double what you said my current amp would put out (ish). Or have I missed something again ?

If its somehow about voltage where did you see that? Or how did you work it out? I'm just interested so I can do the same when hunting for upgrades..

Cheers,
K

Bill Fitzmaurice wrote: ↑Tue Jun 06, 2023 12:44 pm I wouldn't go down the 2 ohm road.

Is this because it works the amps too hard in the longterm? . Or because of a sound quality issue?


What about doing as Seth described but with two of the 8 ohm version of the fountek FW322 driver?



Regards.

Kairos

Seth wrote: ↑Tue Jun 06, 2023 12:22 pm As a side note, part of the goal, if he chooses the dual 12" route, is to find two 12" drivers that cost about the same as one 3015LF.

I'm not sure how tax and shipping works over there but I've found the Fountek FW322 4ohm driver on UK sites between 119€ and 146€

I ran a pair of Fountek FW322 4ohm drivers in parallel in my not-exactly-right 30" T48 hornresp model against a single 3015LF, both on 35 volts and this was the result...



Screenshot (254).png

Thoughts?

Seth, I could get two off these founteks , either the 4or 8ohm Version, for a nice chunk less than a 3015LF costs here, including delivery and tax..

Hmmm, holdup... the vd seems to be considerably lower in the 8ohm Version fountek though. On loudspeaker database ..

Mishkin wrote: ↑Wed Jun 07, 2023 1:25 pm

If its somehow about voltage where did you see that? Or how did you work it out?

Use this....but, make sure you are using RMS power when converting amplifiers....not their stupid peak numbers.

http://www.sengpielaudio.com/calculator-ohm.htm

Mishkin wrote: ↑Wed Jun 07, 2023 1:25 pm

Seth wrote: ↑Tue Jun 06, 2023 2:03 pm

Mishkin wrote: ↑Sat Jun 03, 2023 5:33 pm this Emphaser amp (I've heard good things about them) promises 1 x 600 W RMS at 4ohms.
https://www.emphaser.com/products/monol ... 1/?lang=en

That amplifier has specs that are essentially the same as what you already have.

Are you sure about that Seth. The stated watts at 4ohms are double what you said my current amp would put out (ish). Or have I missed something again ?

I'm actually not sure about that. Is EM-PHASER a relatively well known and well respected brand over there? I've never heard of it before. In my experience, not-so-well-known amp companies, well known budget amp companies, and sometimes even well known and respected amp companies only advertise their "peak" output and are bold enough to even claim it's RMS. Almost none state an honest and true RMS without also stating a max output. If their "rated power output" IS truly continuous RMS figures, then you're right, it is double. I'm doubtful that's the case. But, I've been wrong many times before and will wrong again.

The Pioneer specs indicate both, continuous and maximum output figures, and I find it believable.

If its somehow about voltage where did you see that? Or how did you work it out? I'm just interested so I can do the same when hunting for upgrades..

You can use an online calculator like Bruce posted. But, the calculations are easy enough, that for me it's easier to just punch the figures in a calculator real quick, than it is to search for an online calculator and enter the figures in... even if I'm already on my PC.

Volts x Volts ÷ Ohms = Watts
The Square Root of (Watts x Ohms) = Volts

But, like Bruce said, the numbers are only helpful if you're fairly certain it's a true and honest RMS figure.

Mishkin wrote: ↑Wed Jun 07, 2023 2:38 pm Seth, I could get two off these founteks , either the 4or 8ohm Version, for a nice chunk less than a 3015LF costs here, including delivery and tax..

Like I said before, if there's a chance this cab could become part of a larger multi cab system in the future, my vote is the 3015LF. Four 30" 3015LF loaded T48's will play to quite a crowd and be reliable if properly limitted and high-passed.

And if the Van/bicycle system is likely to be the end game for this cab, I personally think the 4Ω Founteks will suit you really well and not require you to also upgrade the amp to get the most out of them. Save money on the drivers, save money on the amp, invest it in the Dayton Audio DSP-408, and you'll truly have a kick ass system with amazing sound quality once it's all tuned.

Running a 3015LF with the amp you have will be down 5.7dB from using an amp capable of producing the full 60 volts. A noticeable difference, but not a huge difference. In my not-perfect model of the T48, the 3015LF at 60v is very similar in output to two of the Founteks wired parallel on 31volts, I don't think you'd notice a peak volume difference between the two.