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 The Official Subwoofer Thread v2, Everything you need to know about bass!

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mys_terious
post Oct 7 2009, 11:55 AM

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QUOTE(htkaki @ Oct 6 2009, 11:20 PM)
No worry, typo as I do not have the actual list wt me.
Easternred's unit should be the final 2 direct shipments to Malaysia  smile.gif
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mine also final few izt
SUSlogit85
post Oct 7 2009, 01:07 PM

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edit

This post has been edited by logit85: Oct 7 2009, 11:33 PM
mpyw
post Oct 7 2009, 02:27 PM

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Great article on where to place your sub-woofer:-
QUOTE
Subwoofer Placement

HomeToys Article - Subwoofer Placement
Author: Steve Feinstein, Atlantic Technology

“Where do I put the subwoofer?” This is probably the most often-asked question when putting together a home theater system. It can be dazzlingly confusing, or strikingly clear, depending on how you approach it. We prefer the ‘strikingly clear’ approach ourselves. We’re sure you will, too.

Probably the most important thing to remember is that all rooms have what engineers refer to as “room modes” or “room resonances,” whereby the room’s dimensions will either reinforce or weaken certain bass notes where the bass wavelengths correspond to the room’s dimensions.

With traditional box subwoofers, it’s best to experiment with placement, since no two rooms are exactly alike. Keep this in mind: room boundaries—such as floors, walls, and ceilings—act like “acoustic mirrors,” and will reinforce the subwoofer’s output. Therefore, a subwoofer placed 3 feet out from all the sidewalls behind a chair, for example, will sound thinner and weaker than the same sub in the same room placed directly at the floor-wall intersection.

Probably the most important thing to remember is that all rooms have what engineers refer to as “room modes” or “room resonances,” whereby the room’s dimensions will either reinforce or weaken certain bass notes where the bass wavelengths correspond to the room’s dimensions.

Asymmetry is your friend! (Huh?)

The best way around this (especially if you aren’t using expensive, complicated room diagnostic tools and fancy equalization) is to locate the subwoofer asymmetrically in the room with respect to the room’s dimensions.

Even if you have an “auto-EQ” subwoofer system, locating the subwoofer(s) in a good place to start with greatly increases your chances of getting good, powerful, uniform bass in that room.

For instance, if the sub is going to be placed along an 18-foot wall, try locating it, say, five feet out from the corner. Five and thirteen feet are mathematically unrelated, which is good. (Remember your 6th grade arithmetic: 5 and 13 have no common factors, and 13 is not evenly divisible by 5. Got that? Mrs. Gunderson would be so proud of you.).

Therefore, those distances (5 and 13 feet) don’t conspire together to reinforce or cancel harmonically-related frequencies. On the other hand, if you located the sub 6 feet out from the corner, then you’d be left with 12 feet. Not as good, because 12 and 6 are directly related (2:1 or 1:2), and you could get either a buildup of room modes around harmonically-related frequencies (imparting an objectionable, thick drone to the bass) or a destructive cancellation, robbing the bass of its body and weight. 9 feet out (mid-wall) is even worse, because then it’s 9 feet and 9 feet.

If you have the space and budget for two subwoofers, that’s even better. Not only can you achieve higher bass loudness levels in your room with lower distortion, but as you now know from the preceding discussion about room dimensions, you can really randomize the effect of room resonances by placing the two subwoofers asymmetrically in the room. The response will be very smooth, with great impact and definition.

You get the idea. Experiment with placement. Keep the placement asymmetrical (see Fig 1). If you have two subs, locate them in a non-mirror-image manner (see Fig 2).

user posted image

user posted image

anfieldude
post Oct 7 2009, 02:30 PM

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QUOTE(mpyw @ Oct 7 2009, 02:27 PM)
Great article on where to place your sub-woofer:-
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Great find mpyw!

The only problem is in most cases people are not that flexible with moving the subwoofer!
SUSHornyAngMoh
post Oct 7 2009, 02:42 PM

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QUOTE(mpyw @ Oct 7 2009, 02:27 PM)
Great article on where to place your sub-woofer:-
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I am using Fig2 placement.........except the front left sub is about 1' from wall, right back sub is about 1' on each side in a corner. Measuring output from both sub need spl meter so that sub vol output is about the same due to using different sub & sitting position. smile.gif
anfieldude
post Oct 7 2009, 03:20 PM

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QUOTE(HornyAngMoh @ Oct 7 2009, 02:42 PM)
I am using Fig2 placement.........except the front left sub is about 1' from wall, right back sub is about 1' on each side in a corner. Measuring output from both sub need spl meter so that sub vol output is about the same due to using different sub & sitting position.  smile.gif
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Alternately u could use AS-EQ1 and it would do it for u....
SUSHornyAngMoh
post Oct 7 2009, 03:34 PM

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QUOTE(anfieldude @ Oct 7 2009, 03:20 PM)
Alternately u could use AS-EQ1 and it would do it for u....
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AS-EQ1 only meant for elite lah. sad.gif Peasant like me have to use ear & feel for the bass...........so if for eg when testing U571 whole room & even floor vibrate then feel very good already ( even if hotel California sound like bass makenic tongue.gif ) .
He! He! I am sure my setting if can produce graph sure got big mountain deep valley wan. tongue.gif

This post has been edited by HornyAngMoh: Oct 7 2009, 03:35 PM
mpyw
post Oct 7 2009, 03:52 PM

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AS-EQ1 now only $749 if buy direct from SVS
Add $90 for shipping = $839 x 3.53 = RM2,961 if no tax brows.gif
mys_terious
post Oct 7 2009, 04:11 PM

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QUOTE(mpyw @ Oct 7 2009, 03:52 PM)
AS-EQ1 now only $749 if buy direct from SVS
Add $90 for shipping = $839 x 3.53 = RM2,961 if no tax brows.gif
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or can get antimode 8033 read the reviews saying it does a good job too
jchong
post Oct 7 2009, 04:59 PM

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QUOTE(mpyw @ Oct 7 2009, 03:52 PM)
AS-EQ1 now only $749 if buy direct from SVS
Add $90 for shipping = $839 x 3.53 = RM2,961 if no tax brows.gif
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The $90 shipping is to MY?

Key statement is: if no tax. biggrin.gif
ar188
post Oct 7 2009, 05:08 PM

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QUOTE(mpyw @ Oct 7 2009, 03:52 PM)
AS-EQ1 now only $749 if buy direct from SVS
Add $90 for shipping = $839 x 3.53 = RM2,961 if no tax brows.gif
*
ron won't ship to malaysia direct.. biggrin.gif (htkaki hamplang sapu malaysia liao) thumbup.gif

also you need to send back to where ever u bought it if need repair.. (if buy from USA, send back to there first..)
ERN2
post Oct 7 2009, 05:52 PM

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New owner of used velodyne CHT-12R.

Please add me. t.q.

put in 10X15ft room, happy with it.
mpyw
post Oct 7 2009, 06:01 PM

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QUOTE(ERN2 @ Oct 7 2009, 05:52 PM)
New owner of used velodyne CHT-12R.

Please add me. t.q.

put in 10X15ft room, happy with it.
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Bought from arj?? rclxms.gif rclxms.gif
Welcome to the sub club rclxms.gif
Reix
post Oct 7 2009, 06:20 PM

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So if my room is 11" long, I can put 2:9, 3:8, 4:7, 5:6, 6:5, 7:4, 8:3, 9:2
Cool, so many choices
arj
post Oct 7 2009, 06:39 PM

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QUOTE(mpyw @ Oct 7 2009, 06:01 PM)
Bought from arj??  rclxms.gif  rclxms.gif
Welcome to the sub club  rclxms.gif
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Yup. Face to face nego during the SVS event laugh.gif
SUSlogit85
post Oct 7 2009, 11:34 PM

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Elemental Designs yestaday i chat about LFE he said If you send Left Channel information, and some receivers do have .2 for subwoofers allowing you to have a left and a right then yes you can send left channel information only to the LFE input on the subwoofer

Why LFE dont have Right channel i realy need it
i know LFE left channel only but can't get right channel
but got RCA input left channel and right channel but problem Crossover will cut hz
if use LFE we can disable Crossover but if use RCA still enable Crossover we can't disable Crossover
sad cry.gif
eugenengkarmeng
post Oct 7 2009, 11:47 PM

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QUOTE(logit85 @ Oct 7 2009, 11:34 PM)
Elemental Designs yestaday i chat about LFE he said If you send Left Channel information, and some receivers do have .2 for subwoofers allowing you to have a left and a right then yes you can send left channel information only to the LFE input on the subwoofer

Why LFE dont have Right channel i realy need it
i know LFE left channel only but can't get right channel
but got RCA input left channel and right channel but problem Crossover will cut hz
if use LFE we can disable Crossover but if use RCA still enable Crossover we can't disable Crossover
sad  cry.gif
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Alamak its you again, need Panadol lol! doh.gif doh.gif doh.gif rclxub.gif
mpyw
post Oct 8 2009, 08:02 AM

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QUOTE(arj @ Oct 7 2009, 06:39 PM)
Yup. Face to face nego during the SVS event laugh.gif
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aiks....curi customer dari htkaki? sweat.gif tongue.gif
htkaki
post Oct 8 2009, 09:23 AM

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It's ok lah as long as arj taking the PC13-Ultra. LOL....



ERN2
post Oct 8 2009, 09:48 AM

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QUOTE(htkaki @ Oct 8 2009, 09:23 AM)
It's ok lah as long as arj taking the PC13-Ultra. LOL....
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Sorry tauke, curi your nice place for the deal.
listen to SVS bought Velo... blink.gif tongue.gif

Although I cant feel it, but I belive the worth of mouth from so many sifus...my next upgrade will be SVS...... rclxms.gif drool.gif

but all my ht rigs are 2nd hand............. rclxub.gif poor guys what to do doh.gif whistling.gif

This post has been edited by ERN2: Oct 8 2009, 09:49 AM

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