sub build options. Bass heads need apply - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 3 Old 02-11-2020, 03:29 PM - Thread Starter
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sub build options. Bass heads need apply

Thinking of new subwoofer project using Eminence 15" drivers. I can build them in separate boxes and wire in parallel for a 4 Ohm load or place both in the same box. Maybe dual opposed, both facing forrward, or maybe Push/Pull design.
Any Pros or cons with these Eminence woofers? (specs below) Hoping someone can model for me. Sealed and/or Ported or horn and amp requirement.

Side option: My sister let her drivers dry rot on my old M&K 212 subs. I can buy replacements for $60.00 each. Surprisingly the amp still works. They are 16 Ohm drivers but im not sure If I use a newer amp how to wire them properly (out of phase). Do I just run the Pos + and Neg - from one woofer to the next? (pos to neg & neg to pos) and does that also drop them to an 8 Ohm load?

Perhaps the Eminence drivers are the overall better choice.

Rated RMS Power: 600 Watts
Rated Max Power: 1200 Watts
Impedance: 8 Ohm
Sensitivity: 89.5db 1w/1m
Frequency Response: 20hz -250hz
Voice Coil: 3"
Magnet: 160oz. Ferrite
Overall Diamater: 15.34"
Cutout Diameter 14"
Mounting Depth 7.75"
Weight: 24lbs.


Re: 5.10 Ohms
Le: 2.85mH
Impedance: 8 Ohm
Fs: 25.6Hz
Qts: 0.35
Qes: 0.38
Qms 6.04
Vas: 125.2L (4.4cuft)
Bl: 25.31
Sd: 823.7 cm^2
Xmax: 14.25mm

Marantz 7702mk2, Panasonic 8000 w/ 130" AT Screen HTPC w/60 tb
DIY QSC SC-2150 L,C,R (10) QSC SR-8101 sides, rears & atmos/dst-x
DIY (4) Fusion Tempest, 88 Special
DIY (6) JBL cx12" UM-15", SI-18" subs, BFM Tuba HT, Dayton MKIII 15", (2) PA460 mbm
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post #2 of 3 Old 02-17-2020, 07:42 AM
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I would definitely go with 2 separate subs rather than a single, more powerful sub. Two subs have a much better chance of a smoother in-room frequency response than a single sub. As for enclosure type, I'm rather partial to large ported or large horn enclosures. There is a design in The Devastator Index for a microDevastator for 15" subwoofers that you might want to look at. Similarly, one of the smaller Marty designs would probably work well. WinISD is not that hard to learn if you want to model that speaker yourself. Just read the help file about entering TS parameters and you will be on your way.

Mike
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post #3 of 3 Old 02-18-2020, 08:57 AM
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Those Eminence drivers look decent enough, but I'm not sure what they would add to your existing stable of subs, unless they are going in a different room or are for someone else.

A classic vented alignment would put them in boxes 2.5 to 3 cubes tuned to +/- Fs. Thiele and Small would be proud.

Or you could trade off some output above 30 Hz & power handling for extension by going with boxes around 6 cubes tuned to ~20 Hz.

A classic closed box would be around 1.5 to 2 cubes.

Good luck

"Rock and roll is alive and alright" Sloan
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