file Help with bass reflex - 2x 15"

6 years 7 months ago #20335 by rastafarlig
Replied by rastafarlig on topic Help with bass reflex - 2x 15"
Sounds like I bought the wrong PA's :)
But it was a huge bargain..

So what if I choose to go with a single 15" vented, how low will it then go?

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6 years 7 months ago #20336 by chrapladm
Replied by chrapladm on topic Help with bass reflex - 2x 15"
With your limited space I would port around 50hz. That way the ports will be short. Two 4"/100mm x18"/46cm long ports will give you 55hz tune in a 30liter cabinet. If you try and tune lower you need bigger ports. And they will not fit in the cabinet.

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6 years 7 months ago #20338 by rastafarlig
Replied by rastafarlig on topic Help with bass reflex - 2x 15"
So if I go with 40liters - it will go to 51.18hz.
and then I will add two ports with the sizes 100mmx460mm?
Should I worry about the xmax in this cabinet?

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6 years 6 months ago #20363 by rastafarlig
Replied by rastafarlig on topic Help with bass reflex - 2x 15"
The Bill Fitzmaurice's Jack 15 also looks really nice..

I can't seem to find any plans, is it not free? If not, where can I buy it?
Do you think that i'm able to fit one of them in a space around 60x60cm and the height about max 80cm.

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6 years 6 months ago #20364 by chrapladm
Replied by chrapladm on topic Help with bass reflex - 2x 15"
558x558x508 for the Jack 15
457x457x558 for the Jack 12
381x406x508 for the Jack 10.
All of these designs can play pretty loud. I dont know what type of volume you need. You could also power these Jack's with as little as a 10watt amp also. 10 Watt amp could run off a couple of batteries if you want to be extremely portable. Or you could use a small battery for more wattage/running time.

Sort of just throwing ideas at you because I dont know what exactly your trying to do.

The plans are purchased from Bill's site for 15usd each. If you order more plans they become cheaper.

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6 years 6 months ago - 6 years 6 months ago #20366 by rastafarlig
Replied by rastafarlig on topic Help with bass reflex - 2x 15"
The green and the red bike on this picture sounds really good. I don't know how low it goes.
I don't know if this gives you any clue at all. I haven't got any specs, the only thing I know is that it is NEO units, and mine is not.

But as you see they managed to fit two 15" as reflex.. But I think I figured that it is only possible with one of my PD.154.. am I right? :)

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6 years 6 months ago #20368 by chrapladm
Replied by chrapladm on topic Help with bass reflex - 2x 15"
Some of those are very tall. Very tall. If this is just a matter of sounding good then a single Jack 15 would be all you need. Have a external mixer with EQ and your set. You will need to power all this with something also.

The reason I said your 15's would not fit is because you said it had to fit in the cart. But if you are not limited vertically then anything would fit. BUT a single Jack 15 would probably be just as loud as anything there and use less watts and sound better. Bill, the designer, has done an awesome job on the design of the Jacks. Very efficient and can get pretty dang loud.

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6 years 5 months ago - 6 years 5 months ago #20502 by rastafarlig
Replied by rastafarlig on topic Help with bass reflex - 2x 15"
Okay, sorry to bother you guys again..

how does this look? is it true that the pd.1550 will go down to 31hz?? :ohmy:
46.64 ltrs is a cabinet somewhere around 31cmx60cmx25cm?

If everything above is true, and i'm correct, which 12v class d amplifier would you recommend if I go with two pd.1550?

Thanks in advance

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6 years 5 months ago #20505 by chrapladm
Replied by chrapladm on topic Help with bass reflex - 2x 15"
What is your port velocities?

You need to try and keep this under 25m/s or lower depending on port size. WinISD just ports at Fs or close to it. SO you can tune lower if you wanted to. BUT for outside I would tune at tuning or higher to gain some spl.

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