[bmxmen]

Hallo Im new on the forum,so my name is Kamil, nice to meet you all!
Im building earthquake supernova 15 subwoofer. I have some queastions for you.The orginal supernova have 2,5 cuft3 i think but it is good feet for low bass ? I have slaps 15 with no mass added ,but i have seen on photos that some of supernovas have added mass to the slaps ,how much masss i must add ?The magma speaker is connect in 1.6ohm configuration or 6.4ohm ?The sub have any wool or something like that inside ?Please help my becouse it is construction of my life! Bye

 

[Mike P.]

Do you have a link to the subwoofer that you will be using?

 

[bmxmen]

I want to build that sub http://www.hometheaterhifi.com/subw.../598-earthquake-supernova-mkvi-subwoofer.html
This is the speaker 15':
http://images.google.pl/imgres?imgu...&prev=/images?q=magma++15&hl=pl&lr=&sa=N&um=1

 

[Mike P.]

The Magma 15 has dual 4 ohm coils. What amplifier will you use?

 

[bmxmen]

magma 15 has dual voice coil ,3.2ohm ich of one. I have mosfet holton and it is working on 2ohm with 800wats.

 

[Mike P.]

With the sub wired in parallel the amp will work. Shown is the Magma 15 in 1.7 cu.ft tuned to 17 hz with 800 watts power. There are no specs for the Slaps 15" Passive Radiator, you will have to contact Earthquake and ask them how much mass to add to tune a 1.7 cu.ft. box to 17 hz.

 

[bmxmen]

the orginal supernova mkvI have it 2,5ft.cu (71litres)and on the site of earthquake they recomend 2,5ft cu to a low bass,but nothing about mass. I have sent them a massage but no answer yet.Sory for the bad english. I didint get any thiele/small info about slaps radiator. Bye and thanks for response.

 

[Mike P.]

Here is also 2.5 cu.ft tuned to 15 hz. Only Earthquake can tell you if it is possible to tune a SLAPS 15" that low.

 

[bmxmen]

I think it look better in 1.7 cu ft enclusure, the bas near 20hz will be with bigger spl.

 

[Leo]

Hi,

if you want to get more punch try to reduce the volume.

Leo

 

[bmxmen]

I want get more low bas. I have heard thah 1.7ft cu encluse and add to a 11gram to a slaps and it will be good.

 

[Leo]

OK!

 

[bmxmen]

Sory wrong info. I must build 1,97cu ft (67litres) 16'16'16' cube .Must ad 312 grams ,11ounces to a slaps 15, what do you thing about it? i dont know what dimension do i have, with a amplifier inside or without. How many litres the supernova amplifier may have? i have try to calculate the dimensions what i have to a orginal supernova 18'18'20' and i thing the amplifier from supernova has 7 litres (0,247 cu ft)but i dont know the aplifier have own mini enclusure inside sub,or the amplifier is naked inside.

 

[Mike P.]

I would say the amplifier does not have its own enclosure. The displacement of the amplifier is very small, it would not make much difference in the total internal volume of the sub. 1.97cu. ft. = 56 liters, add 11 liters for driver, SLAPS and bracing = 67 liters = 16" internal cube = 18.5" external cube.

 

[bmxmen]

I dont know that I understand what mean bracking it is some wood in enclusere that make it firm? What do you think what thick of mdf it will be good? but please write it in milimetres.Driver has it 4,5 litres, slaps i dont know but not much becouse it is totaly flat it takes max 2 litres. 312 grams it is heavy and it is on smal bolt, it is possible that the bolt would broke the slaps.Bye.

 

[Mike P.]

Yes, bracing makes the cabinet firm. There is a cabinet and bracing calculator here:

http://www.hometheatershack.com/forums/enclosure-volume-calculator/

The cabinet should be built of 19 mm MDF.

 

[bmxmen]

19mm will be good?I was searching for a 30 mm mdf but it is very hard to buy it.I was thinking to putt 3 bracking inside or one big look like wall with lots of holes. Put inside some wool?

 

[Mike P.]

19mm will be good. The box will not be very big, you can brace it like this:

 

[bmxmen]

looks good but it will be hard to put this kind of crates inside becouse the speaker is big and the enclosure is small that small. If i putt a one wall with lots of holes in it.I was wonder if the orginal have it any bracking inside. This enclosure you show me is PR enclosure?

 

[Mike P.]

I was wonder if the orginal have it any bracking inside.

I would say yes.

This enclosure you show me is PR enclosure?

Yes, a 10" sub with 2 - 10" PR's. The cabinet size is 66 liters.

http://www.hometheatershack.com/for...1-creative-sound-solutions-sdx10-sub-kit.html