|   ????? can you use subwoofer for speaker stand??? | pinetop
Feb 25, 2002 3:45 AM | | Iwant to use a velodyne sub for a speaker stand anyone see a problem here? Iwant to mount a speaker on top of the sub will there be a sound problem or will i be ok. thanks |
| This looks like a job for............Norm Strong! | Ajani
Feb 25, 2002 5:43 AM | | If I remember correctly Norm has one of his front speakers mounted on a subwoofer. So I think that you should be alright. Apart from the possibility of the speaker vibrating off onto the floor - I don't perceive there being a problem.
Ajani |
| This looks like a job for............Norm Strong! | pinetop
Feb 25, 2002 5:52 AM | | Well if it works for norm it should work for me thanks. bob d |
| re: ????? can you use subwoofer for speaker stand??? | Old_lane
Feb 25, 2002 8:44 AM | | I wouldn't do it if I were you. It just seems impossible that setting a speaker on top of a vibrating surface wouldn't degrade the sound. that coupled with the fact that the speaker would be knee level while sitting. Assuming your sub is on the floor. Also positions for best imaging don't correlate with best bass response. Usually a sub is set in the corner where the proximity of the two walls making up the coner helps to boost bass response whereas speakers should be set about 2-3ft away from any walls so you don't get unwanted reflections. |
| thanks old lane guess i | pinetop
Feb 25, 2002 8:55 AM | | will build some speaker stands. Out of pine of course. |
| Sub as speaker stand = worst possible position | Richard Greene
Feb 25, 2002 11:35 AM | | Even if the subwoofer was the right height for a speaker stand, why not use a pair of real speaker stands?
Locating a subwoofer away from high acoustic pressure zones (such as room corners) usually results in poor bass frequency response and considerably lower output when measured in rectangular and L-shaped rooms.
Using two subwoofers as left and right speaker stands is even worse because adding a second sub located away from the first sub adds cancellations at certain bass frequencies
(in addition to the problems mentioned above). |
| Question bout that last part? | Old_lane
Feb 25, 2002 11:54 AM | | Would these cancellations be more prevalent in this setup? Due to the fact that the two subs would then equidistant from the listener. Or is it simply a bad idea to have two subs and not have them stacked? |
| Second part... | Terrible Terrence
Feb 25, 2002 1:02 PM | | "Would these cancellations be more prevalent in this setup?"
It is prevalent in any setup that includes spaced speakers reproducing mono imformation. And yes it is a bad idea to have two subs and not stack them. Subs can be seperated if they reproduce two seperate signals like the bass from the left and right channel, or bass from the front speakers, and rear speakers. In these cases the bass is decorrolated by time, frequency, and phase and will not produce cancellations.
Terrence |
| How about? | Richard Greene
Feb 25, 2002 2:16 PM | | You should explain decorrelated signals.
Would acoustic cancellations still be possible if there happens to be bass at a specific frequency coming from two or more speakers at the same time?
It shouldn't matter if a bass guitar is playing on one speaker ... while a second speaker plays an explosion
... while a third speaker plays the sound of a car rolling down a mountain ... and the fourth speaker is playing Terrence after eating three cans of baked beans
(how did THAT get in the mix?)
If there is 60Hz. content at the same time coming from several different speakers spread around the room, there should be acoustic cancellations. Right? |
| How about? | Terrible Terrence
Feb 25, 2002 2:56 PM | | "You should explain decorrelated signals."
Decorrelated signals are signals that do not share the same time and phase in audio reproduction.
Would acoustic cancellations still be possible if there happens to be bass at a specific frequency coming from two or more speakers at the same time?
Absolutely. And it is not narrowed down to the bass frequencies either. Two spaced center channel speakers will produce cancellations. The only time you will not experience cancellations is in the upper treble where the wavelengths are too small.
"It shouldn't matter if a bass guitar is playing on one speaker ... while a second speaker plays an explosion
... while a third speaker plays the sound of a car rolling down a mountain ... and the fourth speaker is playing Terrence after eating three cans of baked beans
(how did THAT get in the mix?)"
It does matter. If none of these events shares its output with any of the other channels, it is NOT likely to produce any cancellations. It is also likely that these events will produce bass that is sufficiently delayed, different in amplitude, and have a different duration and decay. That will be enough to NOT cause any cancellations. If there are any cancellations, the next question would be are they audible amoungst all of the other things happening at the same time. Beans are not my problem, dairy is. And there are NO cancellations in THAT output!!!
"If there is 60Hz. content at the same time coming from several different speakers spread around the room, there should be acoustic cancellations. Right?"
Most definately. And it will be both audible and measureable.
Terrence |
| Here I go again,insert smiley face here....... | yogo
Feb 27, 2002 7:43 AM | | "bass guitar is playing on one speaker ... while a second speaker plays an explosion ... while a third speaker plays the sound of a car rolling down a mountain ... and the fourth speaker is playing Terrence after eating three cans of baked beans".
In this case wouldn't there be a problem when the bass freqs interacted with each other when they were the same? i.e. a low E on the bass and a low E from Terrence (sorry Terrence)? Or would that be a non issue because of timing? I would think a sub should handle ALL low freq to avoid ANY interactions. |
| thank you dr greene that helps a lot | pinetop
Feb 25, 2002 12:56 PM | | i thought as much but wasn't sure, well i am right now going to fire up the table saw and get craking thanks again. bob d |
| Or use milk crates. | SmokE
Feb 25, 2002 3:43 PM | | They are free, light and can be stacked for optimum height...just be sure to scratch-off the warning on the side that said: "Do not use for personal use"  |
| re: ????? can you use subwoofer for speaker stand??? | sam9
Feb 25, 2002 4:38 PM | | It won't get you pristine, perfect sound if only because the optimum location for satellites is usually not the same as for the sub. This is moot if you don't have a lot of options for locating speakers.
It won't get you horrible results either. I wouldn't worry much about one or the other vibrating. If there is a significant amount of external vibration, the speaker isn't too super anyway.
By thew way, have yopu got 2 subs or is this for only one speaker? |
| re: ????? can you use subwoofer for speaker stand??? | pinetop
Feb 26, 2002 4:26 AM | | only 1 sub, speaker is not a satellite,, it's 24 inches high 12 inches wide and weighs 35 lbs mounted on top of the sub witch is about 19 inches high. the tweeter is at ear level |
| I would think that's bad idea... | yogo
Feb 27, 2002 7:46 AM | | Everyone speaks of speaker stands being solid and non-resonant. In theory, a sub is just that but in reality.... |
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