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I wish to get a polk audio mm1240 sub.
12in - 425RMS - 4ohm
Polk Audio MM1240.html?search=mm1240&skipvs=T
Now, that's a lot of power I'll need, & I was looking at getting this digital amp from polk
which will produce 500W x1RMS @ 4ohms. Is this too much power for a 425 w rms, & could someone explain the difference between digital amps. Or better yet, could someone recommend an amp for this subwoofer?
Any help is appreciated, thank you
Are you looking to expand the system later?
That is a great amp for that sub, if you planned to later add a second sub and maybe later add two more subs or run two 600W RMS subs at 1-ohm final.
For a single sub, it's kind of expensive, and I personally would like go with the MM1240D sub and a suitable 500W RMS at 2-ohms amp. (The Alpine MRP-M500 comes immediately to mind, but there are LOTS of other good choices.)
c3peintureIs this too much power for a 425 w rms
Not at all - Polk likes a lot of power - and if you are concerned about it, you should be able to easily set the gain to limit the amp's output to 425W RMS.
c3peinturecould someone explain the difference between digital amps.
Errm - not really - I think it is a typo on Polk's site and they MEANT Class D, which is NOT digital. The JBL MS-8 comes to mind as a digital amp (LCD display, auto EQ and time correction), but it's more of a sound processor with amplifier included.
Class D amps draw less power and run cooler than Class AB amps and are recommended for subwoofer applications.
The input to the amp is analog and the output is AC voltage. I suppose a "digital amp" MIGHT be referring to running the input signal through an A-D converter before amplifying it and running it back through a D-A converter - but I don't see much point or advantage in that. Again, I suspect it's either meaningless marketing-speak (it sounds like it would be better) or a typo (which is scary that Polk doesn't know the difference), but they make good products.
Hope This Helps!!!
Anyone else have suggestions?
2002 Ford Focus JVC KD-A815 Sony CDX-GT410u Sony XT-100HD HD Tuner Stock
speakers, no amp, no subs
Great sub and amp. They will work great together.
GMC Sonoma, JVC KD-A95BT, 2 Pioneer TS-D601P in doors, 2 Pioneer TS-G4644R in dash, 2 JL W3v2-D2 10 inch subs, Lightning Audio B4.250.2, Soundstream TX1.1300D
Great response & very quick, thank you. Does the fact that 500w @ 2ohms going to differ from needing around 500w @ 4ohms, or is it okay to use?
Again, thanks for all the info so quick.
You missed a sublety.
If you go with the MM1240 - it is SVC-4-ohm and you want an amp that is 425-500W RMS at 4-ohms. The Polk you originally mentioned is fine, but pretty expensive for a single sub.
If you go with the MM1240D - it is a DVC-4-ohm sub and you would wire the voice coils in parallel and run it with a 500Wx1@2-ohms amp.
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