Ok here goes my assault on this particular forum

[reed8857 10+ year member]

I am getting

2 x Alpine SWR-1241D (specs below) Powered by Soundstream VGA800.2 (Specs Below)

I will be wiring @ 2 Ohms RMS = 400 W each

In my searching it stated that I should build the box different from what the manufacture reccomends due to the increased wattage. However it does not state what would be ideal. What would be the ideal tunning freq? Should it be ported? Perferable I would like to keep the box simple with a sealed enclosure but if I can get better performance out of the Sub with ported than I will do it that way. Thanks for any help.

I listen to everything with rap being the most predominant

Specs: Alpine Type R (DVC..but you prob knew that already)

General-Subwoofers

Diaphragm Material : Kevlar Reinforced Pulp

Magnetic Weight : 89.4oz.

Mounting Depth (top mount) : 178mm (7”)

Mounting Diameter (top mount) : 275mm (10-7/8”)

Recommended Box Types : Sealed/Vented/Bandpass

Recommended Sealed Box Volume : 0.7 – 1.0 cu. ft.

Spider Material : Nomex

Voice Coil Diameter : 50mm

Power Handling

Power Handling Capacity (Peak) : 1000W

Power Handling Capacity (RMS) : 300W

Thiel Small Parameters

Coil Height (Hvc) : 37.74mm

Cone Area (Sd) : 467.59 sq. cm

D.C.Coil Resistance (Re) : 3.6 ohm + 3.6 ohm

Electrical Q (Qes) : 0.45

Equivalent Suspension Stiffness (Vas) : 58 liters(2.04cu.ft.)

Free Air Resonance (Fs) : 28Hz

Frequency Response : 24Hz - 1kHz

Gap Height (Hag) : 10mm

Impedance (Nominal) : 4 ohm + 4 ohm

Inductance (Le) : 3.85mH at 1kHz (1.34mH at 20kHz)

Linear Excursion (X linear) : 13.87mm

Maximum Excursion (X peak) : 27.7mm

Mechanical Excursion (Peak-to-Peak) : 55mm

Mechanical Q (Qms) : 8.31

Sensitivity : 87 dB/W/M

Total Loudspeaker Q (Qts) : 0.43

Amp Specs

Output(Watts) RMS @ 4 Ohms: 200W x 2

Output(Watts) RMS @ 2 Ohms: 400W x 2

Output(Watts) RMS Bridged @ 4 Ohms: 800W x 1

THD:

Signal to noise ration:: > 115dB

Input Sensitivity (Volts): 0.15 - 12.0

Crossover Slope: 12dB

Crossover Frequency: (Hz) 30 - 4k

Dimensions(INCHES) : 11.2" x 2.6" x 16.5"

RUBI (Rapid-Use Branched Impulse) proprietary power supply topology

STACT (ST abilized Apex Current Topology) Reduces power supply stress by 50%

Trident Amplifier protection topology

Hawkins Bass Control Proprietary bass equalization topology

IDI (Intelligent Distress Indicator) gives visual indication of amplifier

protection status

Harmonic Bass Alignment produces tighter, more accurate bass

Fully regulated MOSFET power supply

Triple Darlington Output Circuitry

BIP (Bias Input Protection)

Rail Stabilization Protection Circuitry

Bi-linear selectable two-way crossovers for amplifier and line outputs

Continuously Variable High and Low Pass Crossovers

Balanced Line Inputs for the Highest level of Noise Rejection

Vortex Induction Fan for Thermor Management

Platinum RCA Inputs and Outputs

Platinum 4-gauge Power Connectors

Tri-mode Operation

Click to read more...

 

[bonesninja 5,000+ posts]

imo--go with the sealed box--you can give it more than the recommended rms if you a sealed enclosure. thats as simple as it gets

 

[reed8857 10+ year member]

should i make it bigger? if so how big? and thanks for the repsponse.

 

[bonesninja 5,000+ posts]

i would go about 1 cube per sub---but ask one of the box builders in here like JMAC or BIA BIA

 

[jellyfish420 10+ year member]

imo--go with the sealed box--you can give it more than the recommended rms if you a sealed enclosure. thats as simple as it gets

power handling is greater in a ported enclosure around tuning...

 

[jellyfish420 10+ year member]

if they were mine i would go 1.5-1.75ft^3 per tuned around 30Hz.

 

[bonesninja 5,000+ posts]

well he said he would preferably like to keep it simple and sealed but if he could get better performance---his definition of better may be different than me or you so thats why i recommended the sealed box--he pretty much answered his own question. but you can get awesome with either ported or sealed just depends what kind of bass your lookin 4.

 

[reed8857 10+ year member]

ok time for a dumb question.......wait there are no dumb question.....just dumb people asking quetions.....anyways when someone says there going to tune does that imply that it is a ported box?

 

[reed8857 10+ year member]

I am all about different ideas the more info I have the better decision i can make

 

[JimJ 5,000+ posts]

anyways when someone says there going to tune does that imply that it is a ported box?

Yes, you're correct.

 

[reed8857 10+ year member]

Ok, I know sealed is better qaulity and ported make it louder....I know its a little more complicated than that and alot has to do with personal preference. still, knowing what I just said can anyone give me the advantages to your paticular suggestion for a box....2 sealed, 1 ported. thanks

 

[reed8857 10+ year member]

sound good to me was hoping I was not going to make a mistake, already worry enough about giving the sub more than recommened

 

[bonesninja 5,000+ posts]

sound good to me was hoping I was not going to make a mistake, already worry enough about giving the sub more than recommened

i would listen to jmac--everyone else does--i'm trusting him to design my box

 

[reed8857 10+ year member]

Yeah I have already figured him to be a more repected opinion on this forum

 

[reed8857 10+ year member]

actully the subs are rated @ 300w RMS unless I am missing something?

400 going to them rated @ 300w RMS = more than 38 over