Should I get a pair of these little subs? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th June 2011, 04:27 PM   #1
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Default Should I get a pair of these little subs?

I'd like to see if anyone has any opinions on Polk Audio's MM840dvc subwoofer. They are relativly inexpensive at $80-$120 each, and from what I've been reasearching may be a great 8" subwoofer for a mid-powered system.

The amp I'll run to push these guys is an old-school Gen X Hifonics Thor, rated for 125w per channel at 4 ohms. Wired corectly, this amp should provide conservativly clean power of ~200wRMS, with loading the amplifier down to 2 ohms per channel (DVC 4ohm coils wired in parallel).

The car I'll personally be driving and playing these in is a Nissan 370z, which is a two seater sports-car with minimal trunk space. I'll be installing these subs in place of the spare tire and under-carpet tools. I'm currently running a single Pioneer pre-IB-Flat 10" woofer which sounds decent, but have been told to try 8" woofers for maximum 'impact' punch from my electronica likeness. The pioneer 10" currently sits inside of my factory spare tire.

Has anyone heard, played, or installed Polk Audio mm840 / mm840dvc subs?

Click the image to open in full size.

Polk'd website:
Polk Audio - Mobile Monitor Series - Mobile / Marine Speakers
  Reply With Quote
Old 20th June 2011, 05:08 PM   #2
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
As much as I dislike the attitude and pride of those who run "Sundown audio" products there's no arguing facts and this 8"Sub Is supposed to be a killer in low end reproduction and spl! Tons of vids on it on youtube
  Reply With Quote
Old 20th June 2011, 05:10 PM   #3
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
However I will admit I like efficiency over most other features so those polk subs may be better if you have a lower power amp. The Sundowns are rated at 400rms but I have heard of some people putting over 2k to them for burps.
  Reply With Quote
Old 20th June 2011, 05:27 PM   #4
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
I've seen those little sundown subs myself. I think they are more for ported enclosures with 80db 1w/1m and like you said; maximum SPL. There are a few problems with me running that sub, and believe me I looked at the sundowns, the JLw7, and dd1508. With the exception of the JL, the other two are more for bass hungry folks and dds only recommended for ported boxes. I'm looking for more sql which I know the JL would give but I cannot fit it in my car nor cover the premium cost for 1~2 of them.

1. 80db 1w/1m for that sundown would mean it would probably want a ported box to raise efficiency which is a buzz-kill for my install complexity and fondness of sealed box sound. Also, my amp although powerfull will not be able to drive more than just one of these subs but it could provide 4~500w if needed.
2. Those cost 2x as much. Granted they are probably 4x more powerful than the polks so maybe this isnt so bad off. I'd be able to buy just one of them.

How good do they sound in a sealed box?
  Reply With Quote
Old 20th June 2011, 05:58 PM   #5
RiLoWa is offline RiLoWa  United States
diyAudio Member
 
RiLoWa's Avatar
 
Join Date: Aug 2010
Location: Illinois
I know this may not be the most helpful, but I ran a single MM1040 for a while in about .65 cu.ft. sealed while I was refoaming the surround on my JL 10W6v1. Once I was done re-foaming the JL, I didn't put it back and kept running the Polk. I have since moved on and so has the vehicle, but I still think about that Polk. The vehicle was a Ford Expedition with the stealthbox installed in the side compartment.
__________________
Tools - 1. TPI Scope Plus 440 2. B&K 2125 20MHz Dual Trace 3. Sorensen DCR20-50B 4. B&K 4011 5MHz Function Generator 5. Weller WESD51 6. A big hammer
  Reply With Quote
Old 20th June 2011, 06:01 PM   #6
RiLoWa is offline RiLoWa  United States
diyAudio Member
 
RiLoWa's Avatar
 
Join Date: Aug 2010
Location: Illinois
As a side note, I have been thinking about trying out a pair of the JBL GT0804 which are slightly cheaper and reportedly play well in a tiny .3 cu.ft. sealed box.
__________________
Tools - 1. TPI Scope Plus 440 2. B&K 2125 20MHz Dual Trace 3. Sorensen DCR20-50B 4. B&K 4011 5MHz Function Generator 5. Weller WESD51 6. A big hammer
  Reply With Quote
Old 20th June 2011, 08:39 PM   #7
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
Quote:
Originally Posted by Dr Zeus View Post
I've seen those little sundown subs myself. I think they are more for ported enclosures with 80db 1w/1m and like you said; maximum SPL. There are a few problems with me running that sub, and believe me I looked at the sundowns, the JLw7, and dd1508. With the exception of the JL, the other two are more for bass hungry folks and dds only recommended for ported boxes. I'm looking for more sql which I know the JL would give but I cannot fit it in my car nor cover the premium cost for 1~2 of them.

1. 80db 1w/1m for that sundown would mean it would probably want a ported box to raise efficiency which is a buzz-kill for my install complexity and fondness of sealed box sound. Also, my amp although powerfull will not be able to drive more than just one of these subs but it could provide 4~500w if needed.
2. Those cost 2x as much. Granted they are probably 4x more powerful than the polks so maybe this isnt so bad off. I'd be able to buy just one of them.

How good do they sound in a sealed box?
Probably not as well, I see your more like me where SQL matters more. Then for the price range and rms handling the mm's would probably fit your liking then. I haven't heard them so I cannot comment. It's been a long time since I could find a good sealed type sub like the IDQ max's
  Reply With Quote
Old 21st June 2011, 02:57 AM   #8
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
We use the ten inch version of this sub at work and we have had very few issues with any of them and they sound very good even in the terrible enclosure we are forced to put them in. I have had thoughts of grabbing a pair of these for myself.
  Reply With Quote
Old 24th July 2011, 08:24 PM   #9
RiLoWa is offline RiLoWa  United States
diyAudio Member
 
RiLoWa's Avatar
 
Join Date: Aug 2010
Location: Illinois
Just wondering if you pulled the trigger on the Polk's.

I did on one JBL GTO-804 and just finished the .6 cu.ft. vented enclosure. Very impressive little driver for $58. I must agree with all of the positive reviews around the WEB about it. So, if you haven't bought the Polk's yet you may want to give these a shot.
__________________
Tools - 1. TPI Scope Plus 440 2. B&K 2125 20MHz Dual Trace 3. Sorensen DCR20-50B 4. B&K 4011 5MHz Function Generator 5. Weller WESD51 6. A big hammer
  Reply With Quote
Old 25th July 2011, 02:36 AM   #10
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
I just bought two mm840dvc subs but have not started on the new box. its gonna take a week or so.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pair of small subs, TH? chris661 Subwoofers 20 5th February 2011 05:39 PM
FS:1 Pair AE IB15-8 subs Rightbrained Swap Meet 1 9th February 2010 08:51 PM
Pro-amp to drive pair of subs Al Garay Subwoofers 2 20th July 2004 03:27 AM
WTB: Cheap Pair Of 12" Subs TheNoodPoopler Swap Meet 0 2nd June 2004 03:18 AM
My next *pair* of subs for sure! Circlotron Subwoofers 27 27th November 2003 10:41 PM


New To Site? Need Help?

All times are GMT. The time now is 07:18 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2