I have some 10″ subs that have been freed up recently and I was thinking about doing some experiments with PRs. Do you offer any PRs smaller than 15″? If not, would a 15″ PR be a decent option or a waste? I’m looking at a box around 1.4 cu.ft. tuned around 25 – 30Hz.
The speakers I have “left over” are Infinity Kappa DVC;s. My biggest issue with them at the moment is that they are 4Ohm coils so I would have to run them at 8Ohms and the price increase for an amp to push them is more than the cost of a 4Ohm speaker like the Infinity Kappa Perfect 10.1, which I’m also considering.
The 100.3DVC doesn’t seem to be listed on Infinity’s web site any more but the parameters are in BassBox Pro. If you can’t get them, I can pull them out later and post them here.
Here are parameters for the 12″ PR’s:
Fs: 7.3 Hz
Vas: 279 L
Mms: 670 g
Sd: 530 sq cm
There is also a 970gram model but you would be tuning about 22hz with a pair of them. Looks like a pair of the 670’s will tune you right around 27hz.
The driver you have has fairly low motor strenght but could be ok.
Electromotive force can be found by squaring Bl and dividing my Re. The resulting number is one you can use to easilly compare from driver to drive, very much like horswpower for a car. 100 is 2x as strong as 50.
BL = 14
Re = 7.8
BL = 9
Re = 1.9
Which one is stronger? Driver two by almost a factor of 2. Many MFR’s will give a BL rating for coils wired in series, but show the DCR as paralell to try to make you ‘think’ it has a stronger motor.
Marketing types. (Can’t stand em)
Very loosely – yes.
B is the measure of flux density across the magnetic gap (strength of the magnetic field) and L is the length or quantity of wire in the coil submersed in that magnetic field.
X size magnet, and Y size coil do not always add up to x+y however.
Magnetic material grade, and level of magnetization, as well as magnetic conductivity of the steel used in the return circuit, the shape of that steel and whether it’s saturated or not, all affect B.
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