8" Sub BOX recommendations...
11-01-2007, 07:39 PM
#11
50 Watt CAFz'r
Thread Starter
Join Date: Oct 2007
Posts: 141
For an 8" driver in a low-power application, why not try building your own enclosure? 8" prefab boxes are uncommon, and most shops don't stock them though could order one from hammerhill etc... You mentioned a 220 watt alpine amp...do you mean a MRP-T220? If so, that's only 140w RMS @ 4ohm mono, or 2x50w RMS. It's a small amp, the bare minimum for a subwoofer application, however it should be adequate for your Polk 8".
I'm not familiar with the Polk woofer, but it should accommodate a very small enclosure (basically big enough to hold the speaker itself)
I'm not familiar with the Polk woofer, but it should accommodate a very small enclosure (basically big enough to hold the speaker itself)
the amp that i will buy is the Alpine MRP-M450 stated at 220W RMS.
i think it will be ok for the 8" 200W PolkMomo. right?
Jazz
11-02-2007, 01:03 AM
#13
500 Watt CAFz'r
Join Date: Apr 2006
Posts: 633
Well from what I can tell, those MOMO subs come 4 ohm DVC, meaning that either you will get too much power from the amp (400rms at 2 ohm) or not enough (100? at 8 ohms) So if you're looking at running only one sub, try finding a smaller mono block that will give you 200rms at 2 ohms. I might be wrong about the coil configurations, but I'm assuming that they only come dual 4's. I have an re8 and it is also dual 4.
11-02-2007, 05:44 AM
#14
50 Watt CAFz'r
Thread Starter
Join Date: Oct 2007
Posts: 141
Well from what I can tell, those MOMO subs come 4 ohm DVC, meaning that either you will get too much power from the amp (400rms at 2 ohm) or not enough (100? at 8 ohms) So if you're looking at running only one sub, try finding a smaller mono block that will give you 200rms at 2 ohms. I might be wrong about the coil configurations, but I'm assuming that they only come dual 4's. I have an re8 and it is also dual 4.
Details:
mono subwoofer car amplifier
220 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms)
variable low-pass filter (50-200 Hz, 24 dB/octave)
tuned Bass EQ (0-12 dB bass boost at 50 Hz)
subsonic filter (15 Hz, 24 dB/octave)
MOSFET power supply
CEA-2006 compliant
STAR Topology (minimizes internal noise and prevents ground interference)
speaker- and preamp-level inputs
gold-plated screw terminals
fuse rating: 20A x 2
8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
9-3/4"W x 2-3/8"H x 9-9/16"D
warranty: 1 year
Want more peace of mind? Extended Service Plans Available
SUB
Details:
8" 4-ohm subwoofer
metalized polypropylene concave cone with high-roll butyl rubber surround
non-resonant, heavy-gauge stamped steel basket
suitable for marine use
professional grade, nickel-plated, locking push terminals
power range: 30-200 watts RMS (400 watts peak power)
frequency response: 26-200 Hz
sensitivity: 85 dB
top mount depth: 4-3/16"
sealed box volume: 0.35 cubic feet
warranty: 3 years
will they work?
Jazz
11-03-2007, 03:54 AM
#15
500 Watt CAFz'r
Join Date: Apr 2006
Posts: 633
Providing that it is a 4 ohm single voice coil sub it appears to be a good match. So how much room are you willing to sacrifice for the sub? I would make a decent (big) sized box and tune it low and you will probably be amazed that it's an 8. Do any of your friends have a set up with 8's? A buddy of mine had 2 8's in a big ported box and it sounded great. Best of luck.
11-03-2007, 02:06 PM
#17
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11-03-2007, 08:16 PM
#19
11-04-2007, 03:41 PM
#20
50 Watt CAFz'r
Thread Starter
Join Date: Oct 2007
Posts: 141
Providing that it is a 4 ohm single voice coil sub it appears to be a good match. So how much room are you willing to sacrifice for the sub? I would make a decent (big) sized box and tune it low and you will probably be amazed that it's an 8. Do any of your friends have a set up with 8's? A buddy of mine had 2 8's in a big ported box and it sounded great. Best of luck.
thanks
Jazz
