Built a box to small

[brdhntr]

Vas was supposed to be 1.094 cu ft, I built .55 cu ft. I am not a sound guru, so I require very basic responses. My main question is what effect does this have? My perception is not enough low freq. Is this a result of building my box to small? What can be done to limit the negative effect of under sizing the box? Thanks for any input into what may be seen as another annoying novice post.

[Inductor]

You don't say the basics. What is your driver? Maybe we can help. Is like saying you have a car but is not a Ferrari, what's wrong with it's engine.

Originally Posted by brdhntr

Thanks for any input into what may be seen as another annoying novice post.

No problem mate.
Imperial or metric? (I can't see your country) I see it's Imperial, ok.
Please describe the box you already have. (Dimensions int. or ext., Material Thickness, Ports if any)
Maybe this can help as a first approach to the problem
Speaker Box Enclosure Designer / Calculator
Enclosure Volume Calculators (EVC)

[brdhntr]

Specifications and Small Signal Parameters
Voice Coil Impedance: 4 ohm
Rated Frequency Response: 40 - 5k Hz
Sensitivity: 89 dB SPL
(Average 500 - 2.5 kHz, 2.83V, 1 meter)
Rated Power: 40 watts
Program Power: 80 watts
Magnet Weight: 340 gr (12 oz)
Fo: 45 Hz
Re: 3.5 ohm
Qts: 0.51
Qms: 7.84
Qes: 0.54
Vas: 31 liters
Xmax: 3.8 mm
No: .49 %

This woofer features a polypropylene cone with santoprene rubber surround.
6.57" outside diameter
5.59" cutout diameter

My box is approx 17.5"h x 9.5" x 9.5" external dimensions, and the box is constructed of 1" MDF

This the info on the cross over:

SPECIFICATION:
Type: 2-Way
Crossover Frequency: 5000Hz
Slope: 6dB Low Pass / 12dB High Pass
Impedance: 8 ohms
Power Handling: 150 watts

[srinath]

I put a 12 inch replacement woofer in a box that was just under 2 cuft. That speaker was ideally designed to go into a 3.2 cuft box. Its calculated response in my box is 38-39 hz, but in its perfect box it would be closer to 28 hz.
That only is where there is a 10 db drop from its curve plateau if I understand. So it will play less loud at the location near the lowest freq. That's it. Also I thinnk the vent for a large box is smaller I believe.
Cool.
Srinath.

[brdhntr]

Also, box is sealed

[MJL21193]

Originally Posted by brdhntr

My perception is not enough low freq. Is this a result of building my box to small? What can be done to limit the negative effect of under sizing the box? Thanks for any input into what may be seen as another annoying novice post.

Yes, the box is too small. It is a closed box, correct?
Not much to do other than make the box bigger.

[bastek]

Over stuff it, to make the driver Think its a bigger box?
I don't know where i heard that before.

[MJL21193]

That'll give you 10% maybe, not 50-60%

[brdhntr]

If I built a stand for these speakers, and opened the box into the stand would that work?

[planet10]

You aren't going to get much more bass out of that woofer in a sealed box. Stuffing it or making it aperiodic can lower the Q.

dave