Is it ok to stack receiver on top of the subwoofer?

[shokhead]

I cant belive anyone would think its ok to put a reciever on a sub. Dumb. Skip the second sub and put up a A/V rack. The amp and speaker are made to withstand all the shaking as a reciever is not.

 

[mtrycrafts]

I rest my case.

You didn't have a case to rest

 

[mtrycrafts]

The amp and speaker are made to withstand all the shaking as a reciever is not.

You really think this? Maybe an email to SVS will answer this Q.
They are off the shelf amps.

 

[mustang_steve]

Yes, keep teh HTPC away from the sub.

Vibration may not affect the CD player int hat test, but that pro sub could be far, far more heavily braced in proportion to output than most home subs...so if the cabinet is more vibration prine, more chance for damamge can happen...plus a CD doesn't spin at 7,200 RPM and actually touches the media for data access like a hard drive does....excess vibration on a hard drive is just asking for a problem.

For teh receiver, I wouldn't do it, but there really isn't any solid reason I can come up with for that...I just wouldn't. Heck I'm using a rubbermaid drawer unit with a peice of MDF on top of it for support as my system rack right now...at least it's not on the floor/speakers (I'm in the process of turning it into a ghetto rack of sorts...my inner cheapskate won out on this battle...)

 

[MACCA350]

(it wouldnt fit in the rack without cutting out the back, which I will do shortly).

As stated this is in the process of being moved.

 

[Audioholics]

Ken tested placing a CD player on top of a pro sub, did some measuring too, playing, of the analog outs. Up to 120dB spl. Nada, zilch, zippo

I won't argue that (or with you - I don't have the time to win ) but I am referring to long term effects of vibration, not how it would sound. Sub amps are usually made up of very simple components, wired in an almost DIY manner on large circuit boards. A receiver is, how shall I say, "dainty" in comparison with lots more parts and no practical consideration for having to deal with vibration.

I won't make any further comments on it, but it seems an unneccessary risk to me. Why "try" the experiment when you won't perhaps know if anything goes wrong until a year later when something stops functioning?

 

[shokhead]

A sub over time will loosen its own screws so why wouldnt it do it to a receiver or cd player? It would surly loosen or break something.

 

[warpdrive]

It just seems common sense not to risk subjecting an expensive piece of electronics to high amplitude long term vibration. Some people here are just being silly

 

[Jfconrow]

move it off the sub

 

[mtrycrafts]

Why "try" the experiment when you won't perhaps know if anything goes wrong until a year later when something stops functioning?

To see if vibration can be felt through the receiver or is a simple added foam isolator will eliminate the vibration

BUT, I was able to talk my friend into an experiment, as was suggested in the thread to place some water in a pitcher on top of the sub.
He has a 15" sub. Played a number of CDs with lots of bass, including the Telarc 1812 and their Jurassic lunch. The only slight ripple visible in the water was at the beginning of the Dinosaur's foot steps that is barely audible but the frequency is very low, below 20Hz. Absolutely nothing on the 1812 with lots of pounding, very loud, lots of power in those cannons, nor any other CDs.
Maybe it was a better sub???

 

[mtrycrafts]

A sub over time will loosen its own screws so why wouldnt it do it to a receiver or cd player? It would surly loosen or break something.

Oh, you may need to do the water experiment I talked my friend into, as was suggested elsewhere int he thread, to see the vibration.

Zilch, nada, except for a very small ripple on a very quiet but very low frequency passage on Jurassic lunch

When I helped my friend take his drivers out, those screws were very tight. I am surprised that my lug nuts don't come off the axle

 

[mtrycrafts]

It just seems common sense not to risk subjecting an expensive piece of electronics to high amplitude long term vibration. Some people here are just being silly

Perhpas a test will show you otherwise? Someone suggested a picher of water on top to see the vibration

I talked my friend into this experiment, my boombox is too small

Zilch, nada, no ripple, nothing. The only event was witht he Jurassic lunch on the Dino step at the beginning, very low level, very low frequency, well below 20Hz. it barely cause a visible shimmer. The 1812 from Telarc, very lour level, nothing, other CD with lots of lows, nothing, zero.
So, Our experience is that there is absolutely nothing there

 

[shokhead]

Go ahead. Put the reciever or cd player on the sub,i really dont care because its not mine and i know better. Oh,buy btw,i checked my 1k Klipsch sub and there were a few loose screws on it but its 5 years old,it does happen. Btw,dont forget to remove that water. LMAO.

 

[mtrycrafts]

Go ahead. Put the reciever or cd player on the sub,i really dont care because its not mine and i know better. Oh,buy btw,i checked my 1k Klipsch sub and there were a few loose screws on it but its 5 years old,it does happen. Btw,dont forget to remove that water. LMAO.

Why remove the water
It keeps humidity constant?
Reminds my friend of the claims some make

I told him it gives that liquid sound to the bass

 

[nibhaz]

So this discussion has gone on for awhile and I hadn’t planned on putting in my two cents, but for some reason I feel compelled to do so today. Just as others have stated before it’s an unneeded risk and probably not a good idea. Surely you’ve heard a car go by with a pounding sub and heard the vibration of loose body parts and such. Why put less robust PCR boards and their gazillion solder points through needless stress?

mtrycrafts I usually agree with you or at least enjoy your throw caution to wind approach but not today. After reading your post I just had to try the water test for myself…I just could not believe that you witnessed no water movement with Telarc’s 1812 cannons.

So I conducted my own unscientific experiment to see what’s up.

Equipment and supplies used:

B&W ASW600
Technical Specifications : ASW 600
Freq. Response: -3dB 26Hz – 33/150Hz adjustable (EQ at A)
Freq. Range: -6dB 22Hz – 40/180Hz adjustable (EQ at A)
Drive Units: Unit 1: 250mm (10 in) dia paper/Kevlar® cone long-throw
Sub Woofer Amplifier: Class B
Power Output: 150W continuous
Rated Power Consumption: 220W

0.4 Gallons [US] of water = 3 lbs.
1 pitcher (plastic) 1 lbs.
1 12x8 Pyrex casserole dish 3.5 lbs

First I would like to state that it is my belief that my subwoofer is not of the same caliber as many of those being used by others in this forum…thus if it is able to produce significant vibrations then surely a more power/lower going sub would be able to create even more vibration. (Of course I’m ignoring the fact that my sub is only 43 lbs. and may be less solid then other subs, however since I already stated that this was an unscientific experiment so I can do that)

So I started with the pitcher first and Telarc’s 1812 cannons. This resulted in a slight back and forth movement of the water in the pitcher along the same axis as the driver’s movement. By in larger it was fairly uneventful…hmm, perhaps you were right I thought, but then I grabbed one of techno CDs which has a nasty little base sweep in it. This resulted in the whole pitcher shifting about a ½” forward and then back along the axis of the driver’s motion. But there still seemed to be little movement on water’s surface. At this point I wondered if the 6” column of water was damping the bass’s kinetic energy before it reached the water’s surface. So into the kitchen I went and out came the casserole dish. This container obviously allowed the water to have a much larger surface area and reduced the water’s depth to 7/8” So back to the 1812’s cannon…well not much different perhaps a slightly larger wave…perhaps not…to close to call even for this sloppy experiment. So in with the techno….and here is when it got interesting…well at least for me it did This dish was placed so that its 12” length was perpendicular to driver’s axis. After starting up my CD it was apparent something was going on because the dish started to rotate… it rotated 90 degrees and stopped, the whole time displaying a checkered ripple pattern that was only visible from aprox. 1 ft. from further distances is just appeared as a slight disturbance of the meniscus.

So what does this mean…well, nothing really Except that in my environment, with my taste in music, and my equipment there is kinetic energy and the resulting forces doing something on top of my sub. Will this hurt a receiver…who knows…over time…who knows…but it all comes back to why risk it? Gamble at a casino not with you’re A/V equipment!

Who has to much time on their hands…me

 

[mtrycrafts]

So this discussion has gone on for awhile and I hadn’t planned on putting in my two cents, but for some reason I feel compelled to do so today. Just as others have stated before it’s an unneeded risk and probably not a good idea. Surely you’ve heard a car go by with a pounding sub and heard the vibration of loose body parts and such. Why put less robust PCR boards and their gazillion solder points through needless stress?

mtrycrafts I usually agree with you or at least enjoy your throw caution to wind approach but not today. After reading your post I just had to try the water test for myself…I just could not believe that you witnessed no water movement with Telarc’s 1812 cannons.

So I conducted my own unscientific experiment to see what’s up.

Equipment and supplies used:

B&W ASW600
Technical Specifications : ASW 600
Freq. Response: -3dB 26Hz – 33/150Hz adjustable (EQ at A)
Freq. Range: -6dB 22Hz – 40/180Hz adjustable (EQ at A)
Drive Units: Unit 1: 250mm (10 in) dia paper/Kevlar® cone long-throw
Sub Woofer Amplifier: Class B
Power Output: 150W continuous
Rated Power Consumption: 220W

0.4 Gallons [US] of water = 3 lbs.
1 pitcher (plastic) 1 lbs.
1 12x8 Pyrex casserole dish 3.5 lbs

First I would like to state that it is my belief that my subwoofer is not of the same caliber as many of those being used by others in this forum…thus if it is able to produce significant vibrations then surely a more power/lower going sub would be able to create even more vibration. (Of course I’m ignoring the fact that my sub is only 43 lbs. and may be less solid then other subs, however since I already stated that this was an unscientific experiment so I can do that)

So I started with the pitcher first and Telarc’s 1812 cannons. This resulted in a slight back and forth movement of the water in the pitcher along the same axis as the driver’s movement. By in larger it was fairly uneventful…hmm, perhaps you were right I thought, but then I grabbed one of techno CDs which has a nasty little base sweep in it. This resulted in the whole pitcher shifting about a ½” forward and then back along the axis of the driver’s motion. But there still seemed to be little movement on water’s surface. At this point I wondered if the 6” column of water was damping the bass’s kinetic energy before it reached the water’s surface. So into the kitchen I went and out came the casserole dish. This container obviously allowed the water to have a much larger surface area and reduced the water’s depth to 7/8” So back to the 1812’s cannon…well not much different perhaps a slightly larger wave…perhaps not…to close to call even for this sloppy experiment. So in with the techno….and here is when it got interesting…well at least for me it did This dish was placed so that its 12” length was perpendicular to driver’s axis. After starting up my CD it was apparent something was going on because the dish started to rotate… it rotated 90 degrees and stopped, the whole time displaying a checkered ripple pattern that was only visible from aprox. 1 ft. from further distances is just appeared as a slight disturbance of the meniscus.

So what does this mean…well, nothing really Except that in my environment, with my taste in music, and my equipment there is kinetic energy and the resulting forces doing something on top of my sub. Will this hurt a receiver…who knows…over time…who knows…but it all comes back to why risk it? Gamble at a casino not with you’re A/V equipment!

Who has to much time on their hands…me

Thanks for your experiences. I will see if I can convince my friend for more experimentation

We will try shallow dish. In the first experiment we used a large measuring cup, clear. Not even up close could we see anything except that shimmer with Jurassic lunch dino step.
Maybe we need a laser pointer and see if a dot on a far wall will move or not, aligned with axis and 90 deg out
If the dish moves, so should the water. Nothing. But, lets see further. Maybe we need more power into that 1812.

Maybe your dish had a rounded bottom to cause it to rotate?

Now about those resonating parts of a car. That doesn't take much at all
Nor to resonate loose objects in a house with that sweep frequency discs. That is easy. That happens at one resonant frequency only. Damping changes that. That is why I also suggested foam under the receiver's leggs since the poster was in extremis about space

 

[mtrycrafts]

My friend was laughing his head off on my return trip for another demo. We used a shallow, 10"-12" dish, very flat bottom
The 1812 did make some waves in that this time. However, placing my hand on the cabinet made a bigger wave
I suspect high frequency vibration would affect the receiver more than the periodig low frequency And we know how much of that is in a sub

 

[nibhaz]

My friend was laughing his head off on my return trip for another demo. We used a shallow, 10"-12" dish, very flat bottom
The 1812 did make some waves in that this time. However, placing my hand on the cabinet made a bigger wave
I suspect high frequency vibration would affect the receiver more than the periodig low frequency And we know how much of that is in a sub

There were some other factors that I purposly failed to mention Like the fact that my SACD player only allows the front channels to be set to large...and when one of the cannons goes off primarly from the right channel I still got a small wave The right 604 is only about a foot from the sub...and on the left side my rack is where the sub is at on the right however I wasn't about to set an open container of water on top of my receiver to see what was going on there...but I have my suspisions