"Magic Box" V.2 For an 18"

[sundownz]

Been playing with it a bit and still not quite up to Magic Box v.1 performance... need to figure out what works best in this box.

Interestingly the 3 Spider Z v.2 was louder than a 3 Spider Nightshade v.1 in this box at equal power (as three NS spiders is a bit less stiff over stroke they are louder in the 15" v.1 enclosure - 2 Z v.2 spiders was roughly equivalent per watt). This leads me to believe I may need to build several 18s to see what configuration is the loudest.

Plan to build a 2 spider model and a 4 spider model and run them all to see what happens.

[sundownz]

Oh yah... rounded all outside edges of the box and around the port mouth this morning -- zero change in SPL.

[sundownz]

Results so far with Z v.2 18" D2 with 3 Spiders (too stiff for this box):

420 watts = 144.6

520 watts = 145.5

660 watts = 146.4

830 watts = 147.2

1040 watts = 148.0

1310 watts = 149.0

1620 watts = 149.8

1790 watts = 150.1

1960 watts = 150.4

2340 watts = 151.1

* Let Sub Cool for about 15 minutes *

2530 watts = 151.6

3110 watts = 152.4

3390 watts = 152.7

3530 watts = 152.9

3860 watts = 153.1

4160 watts = 153.4

All results @ 53 Hz / dB Drag on the dash sealed mic position on the TL.

Swapped to a 2 spider Z v.2 and found my frequency is actually 54 hz with this box :

920 watts = 148.6

1210 watts = 149.3

1510 watts = 150.1

* Sub cool down for 10 minutes *

1890 watts = 150.9

2570 watts = 152.2

2940 watts = 152.4

* Sub cool down for 10 minutes *

3320 watts = 153.0

3650 watts = 153.1

* Sub cool down for 10 minutes *

3850 watts = 153.4

So... SPL per watt is up now. Tried a few things to get my peak back to 53 hz with no luck yet.

[sundownz]

Threw some good power on it today and hit 155.9 dB -- really close to the v.1 box results but this is with a Z v.2 =)

Now to try an NS v.2 18 in here when they arrive !

[F1rtyfwe]

Threw some good power on it today and hit 155.9 dB -- really close to the v.1 box results but this is with a Z v.2 =)

Now to try an NS v.2 18 in here when they arrive !

vids of it ns v2?

[sundownz]

Do what ? ... Currently using Z v.2 -- will use Nightshade v.2 (NS v.2) when motors arrive. I lent out my only NS v.2 motor.

[sundownz]

Threw some good power on it today and hit 155.9 dB -- really close to the v.1 box results but this is with a Z v.2 =)

Now to try an NS v.2 18 in here when they arrive !

Same score with an NS v.1 today as well (155.9 many times) -- may be maxing out the pressure my Jeep can take with a rear-firing port.

Looks like I need to start on my forward firing setup soon!

[rc.btl]

so you can hit a 150 on 1500 watts.. thats amazing. i cant even break 145 with 2100watts. amazing box.

[audiofanaticz]

Wow, very great results for a single 18!!

so you can hit a 150 on 1500 watts.. thats amazing. i cant even break 145 with 2100watts. amazing box.

I think his 1500watts is clamped power after impedance rise, vs your 2100watts rated power before impedance rise. if so 2 totally different wattage comparisons.

Not completely sure on what amp he is using however.

[Eric B]

Wow, very great results for a single 18!!

I think his 1500watts is clamped power after impedance rise, vs your 2100watts rated power before impedance rise. if so 2 totally different wattage comparisons.

Not completely sure on what amp he is using however.

IIRC 2 SAZ4500D