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Old 18th November 2008, 06:09 PM   #1
Donovad is offline Donovad  United States
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Default Working with existing Sub enclosure

First time sub builder needs some help/suggestions from you folks. I am in the process of restoring a vintage Jensen stereo cabinet that has 2 built in "sub" enclosures in the bottom of the cabinet, originally housing two 1960's Jensen P12NF's. Since i am trying a multi-sub approach I thought i should replace the P12Ns with more of a true bass driver. I am working with cabinet dimensions of 25"x14"x13" w/ a 2" port opening and can obviously make them a bit smaller by increasing the cabinet's interior walls if necessary. Currently I am looking at some replacements that seem well suited to a 2.6cubic ft vented enclosure with a 3" port. Also trying to stay with two 8ohm drivers that i can run off of a single sub plate amp like a Bash 300 or 500.

1)Dayton ST 305-8 12" Series II

Power handling: 275 watts RMS/380 watts max * Voice coil diameter: 2-1/2" * Voice coil inductance: 2.30 mH * Nominal impedance: 8 ohms * DC resistance: 5.7 ohms * Frequency response: 27-2,000 Hz * Magnet weight: 56 oz. * Fs: 27 Hz * SPL: 92 dB 1W/1m * Vas: 5.70 cu. ft. * Qms: 11.72 * Qes: .35 * Qts: .34 * Xmax: 8.0mm * Net weight: 15 lbs. * Dimensions: Overall Diameter: 12", Cutout Diameter: 11", Mounting Depth: 6", Magnet Diameter: 6-1/8", Magnet Height: 1-7/8".


2)Pioneer A30IR50-51F

150 watts RMS/210 watts max * Voice coil diameter: 2-1/2" * Impedance: 8 ohms * Frequency response: 19-5,000 Hz * Magnet weight: 50 oz.. * SPL: 91 dB 1W/1m * Vas: 11.91 cu. ft. * Xmax: 3.1mm * Qms: 4.37 * Qes: .27 * Qts: .25 * Fs: 19 Hz * Net weight: 10 lbs. * Manufacturer model number: A30IR50-51F * Dimensions: Overall Diameter: 12-1/8", Cutout Diameter: 10-7/8", Mounting Depth: 5-1/2", Magnet Diameter: 6-1/4", Magnet Height: 2".


3)GR-Research Sw12B
Mechanical Parameters:

Fs = 18.6 hertz
Qms = 3.707
Vas = 5.05 cu.ft or 142.8 liters
Cms = 0.0688 in/Ib
Mms = 6.47 oz or 183.5 grams
Rms = 12.94 Ibs/sec
Xmax = 16 mm
Sd = 72.5 sq.in or Dia = 9.6 in or 244 mm
Electrical Parameters:

Qes = 0.38
Re = 6.7 ohms
Le = 3.9 mH
Z = 8.0 ohms
BL = 19.4
Pe = 200.0 watts
Combination Parameters:

Qts = 0.344
Sens = 85.8 dB


Other Suggestions on resonably priced, resonably effecient, mid xmax drivers ?

I am not looking for extreme HT type output. Just good stereo music use with occasional movie watching in a small room 12'x14'. A good balance between X-max and effeciency.

Thanks for your time.
Regards, Daniel.
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Old 18th November 2008, 06:27 PM   #2
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Location: North Californie
I like the GR-Research stuff ... reliable, accurate specs ... will not disappoint ...

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