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Go Back   Blu-ray Forum > Audio > Subwoofers

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Old 07-29-2009, 03:11 AM   #1
mj79 mj79 is offline
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Jun 2009
San Antonio/ Duluth Mn
Default Is this true? Downfiring vs front firing..

Someone told me depending on the floor that. Downfiring sub has a tendancy to make you feel the bass more and it will be more " boomy" because it will give a better rolloff. While a front firing sub tends to be louder due to it firing I to the room. I understand all subs have different sounds but is this rule at all correct?
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Old 07-29-2009, 03:45 AM   #2
Driver_King Driver_King is offline
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Jan 2008
Tampa Bay, Florida

Subwoofers produce non-directional sound that is not dependent on how the driver is placed. Shortest answer: no.
My recommended setup for Home Theater Virgins:

Speakers: Polk Monitor 50's, Polk Monitor 40's, Polk CS2 Center, and eD subwoofer or
HTIB: Polk 5.1 system and
Receiver: Non-Network Onkyo TX-SR608 or Onkyo HT-RC180 Network Receiver
Monoprice-For all your cable needs...

Personal Setup + Subwoofer
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Old 07-29-2009, 03:47 AM   #3
cartman781 cartman781 is offline
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Sep 2007
In a van down by the river

I prefer down firing but that's just me, no science to back it up just my opinion
Sony KDS-50A2020
Pansasonic Blu-ray Player
PS3 and 13 games
Onkyo 805:)
Polk Audio Rti10 x2, Polk Audio Monitor 50 x2,Polk Audio CS2,Infinity Primus 250 x2,Klipsch Sub-10
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Old 07-29-2009, 04:09 AM   #4
Rob J in WNY Rob J in WNY is offline
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Dec 2008
'Western' N.Y. State (MEMBER OF THE "ECPP")

With a downfiring subwoofer port, and the sub resting on carpeting, make sure that the bottom of the enclosure (and port) is high enough so that it doesn't "sink in" up to the carpeting. This will restrict the free flow of air through the port, affecting the audio quality - usually for the worse. Elevating the subwoofer on either a stand for this purpose, or even a wood panel (like I do), when on carpet will prevent this.

Sonically, there should be no important differences, except perhaps that if the particular sub has problems with "chuffing" (audibly turbulent airflow through the port opening), a downfiring port may make it less of an audible nuisance.
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Old 07-29-2009, 07:16 AM   #5
Big Daddy Big Daddy is offline
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Jan 2008
Southern California

The placement of a subwoofer in the room is the most important factor in the level of bass output. The orientation of the driver does not play an important role.

If you have children or pets, buy a down-firing subwoofer. If you don't have children or pets and enjoy looking at a woofer, buy a front-firing subwoofer. In general, the quality of the bass sound is not affected by the driver's orientation.

This is a quote from Sunfire, a manufacturer of high-end subwoofers:
The woofer cone can be mounted one of two ways. The first way is called, down firing and the second is called front firing. Subwoofer cones that are down firing are typically on the bottom of the subwoofer cabinet. When they are front firing they are on the side of the cabinet. One of these is not necessarily better then the other. It's just a matter of design and your own personal taste.
Here is what Dr. Poh Hsu of Hsu Research said in an interview by GoodSound:
SE: I've noted that many subwoofers with good reputations for music applications use down-firing rather than front-firing drivers. Is this just coincidence or does it reflect a particular design philosophy?

PH: I feel that's just a coincidence. In the case of the VTF-2, the down-firing design was chosen to save money. A down-firing woofer doesn't need a grill to protect it. The upcoming VTF-3 will have a forward-firing woofer because the box is larger. We feel it would look too plain and large without a grille.
And finally, a discussion of down-firing versus front-firing subwoofers on Hsu Research forum:
HT Room: Panasonic PT-AE8000, Epson 1080UB Proj., Mitsubishi 65" Diamond Series HD TV, Yamaha-RX-A3010 Rec., CinePro 6-Ch. Amp. (350 W/Ch, 8 Ohm), Proton D1200 Amp., Behringer EP4000 & EPX3000 Amps., Oppo BDP-83, Sony BDP-S790, Audio Technica Tuntable, Mitsubishi S-VHS, 2 Def. Tech. Super Towers w 15" subs, 1 Def. Tech. Center & 1 Martin-Logan Center, 2 Def. Tech. Surr. & 2 PSB Surr., 2 Cadence Presence, 2 Bose 901 Rears, 2 Modified HSU 12" Subs, 1 ED DIY 12" Sub, 1 ED DIY 15" Sub, Velodyne SMS-1 Subwoofer Equalizer, DirecTV HD, Monster HTS 5000 & APC H15 Power Conditioners.
Two-Channel Room: XiangSheng Tube Preamp., Carver TFM-45 Amp. (375 W/Ch), Behringer EPX4000 Amp., Onkyo CD player, Denon Turntable, Yamaha Tuner, 2 Vintage Polk RTA-15TL Speakers, 2 LCY 100 Super Tweeters, 2 DIY Folded Horn Super Towers with 15" Sub., 1 Modified AA HD-SUB12
Family Room: Mitsubishi 73" Diamond Series TV, Yamaha DSP-A3090 Rec., DirecTV HD-DVR, PS3, Zvox Speaker, 1 DIY 12" Sub.
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