A New Amp Stand Experiment On Its Way

László

Too Many Notes
Joined
Apr 26, 2012
Messages
34,598
Location
Michigan
You guys know me. I have to be experimenting in the studio or I'm just not happy.

For many years, I've been searching for the most effective way to isolate my guitar and bass speaker cabs from the floor for recording. There are a few problems that always need to be solved.

The first problem is the speaker cabinet transferring its vibration to the floor, thereby causing structure-borne vibrations that in turn cause various items in the room to rattle and buzz. This noise gets picked up by the microphones. Ever record your amp and you hear something in the track that sounds vaguely like the phone ringing (usually your electric light bulbs), or a buzzing noise (often your heat registers buzzing against the walls, etc)? That's structure borne vibration. It's a track killer. It's also the thing that makes your wife want to kill you when your amp makes the whole house feel like it's going to shake apart.

The second is getting the amp far enough from the floor to prevent half-space bass reinforcement resulting from sound reflecting off the floor, which causes muddy sound.

And the final one is to use something sturdy enough to hold the cab in a stable position, even while tilted.

I've tried everything from foam platforms (commercial and home-made), speaker stands, tube traps, hockey pucks, milk crates, stools, chairs, you name it. I have yet to find the long-term solution. The foam platforms come with foam attached to wood to stabilize the thing, but the wood itself resonates and has an effect on the tone. And the foam deteriorates over time.

But I just ordered something that looks like it will do the trick and solve these issues. It's made by a company called Isoacoustics, and it's designed to hold very large monitor speakers and guitar cabinets, and isolate them via decoupled pistons from the floor. It also lifts them a few inches. In addition, it can work on a bench or table if I need to lift the amp higher off the floor, and isolate the cab from whatever it's resting on.

It's this:



And you put your cab on it like this:



Basically, the part that interfaces with your cab is completely isolated from the part that touches the floor via piston-like gadgets that are suspended in special rubber mounts. It'll hold 100 pounds, it raises the amp off the floor a few inches, and the studio monitor versions have been very well reviewed. The amp stand gizmo is a new product for them. From what I gather from the reviews of their similar studio monitor stand products, this company is the real deal, and the isolation really works and results in much clearer acoustics.

This should get rid of most of the mud, and get me more clarity in the all-important midrange, which is where guitars live.

Surprisingly, it's not very expensive for what it is. I will report back once it arrives, and give you guys the skinny on whether it delivers on its promises.
 
Last edited:
Wow, pretty fancy stuff Les. If it works, I bet it'll be great. My 2x12 shakes pretty much everything in my practice space, so I can see why this would be a good thing to have!
 
Should be here tomorrow, guys, and I've got some ad recording to do all weekend, so the timing couldn't be better.

My Genelec monitors have an ingenious decoupling material attached to the bottom of the speakers that the speaker cabinets rest on, and they absolutely are the business. So my hopes for this product are high.

I will definitely report back as soon as I have some experience with this product.

Unfortunately due to the deadlines I'm working under, I won't have time to record "before" and "after" clips, because both projects that have to be delivered Monday, and I'm in the middle of my usual "Gaaaah! I'm falling behind!!!" freakout. So when the thing comes, I'm going to stick the cab on it right away and keep working.

But I'm familiar enough with my room and how the cab sounds recorded that I should be able to give a somewhat accurate report.
 
Last edited:
I guess Fedex had weather delays, and it won't arrive until Monday.

So...yet another project will be done before I get the gizmo I ordered. Ah, well...
 
Subscribed. I'm curious how this compares to the Auralex Gramma. Or, are they 2 totally different animals?

They are designed to do very similar things, namely get the amp off the floor a few inches, and decouple the speaker cab from the structure.. I'll let you know my thoughts once I test it out.
 
I like the Auralex Gramma under my Fender SS22. On the floor, the bass is muddy and boomy, on the Auralex Gramma, the bass seems to be tighter, more defined and not muddy. Does this make sense? I'm not good at describing sound.
 
I like the Auralex Gramma under my Fender SS22. On the floor, the bass is muddy and boomy, on the Auralex Gramma, the bass seems to be tighter, more defined and not muddy. Does this make sense? I'm not good at describing sound.

It makes perfect sense. What is happening is that by decoupling the amp from the floor, and raising it a little, two things are happening that are good:

1. Vibrations aren't being directly transmitted to the structure, they are being absorbed by the foam; thus there aren't sympathetic resonances that muddy tone to anywhere near the same degree.

2. The speakers are a bit farther from the floor. This reduces reflections from the floor that are called "half space doubling." The bass clears up as you move away from the surface of the floor because less bass is reflected by the floor.

The idea of the Isoacoustics product is to take this concept a little further.

1. The Isoacoustics stand is more rigid than a foam platform, and is designed to reduce the back and forth movement inherent in a cabinet with a large moving piston (i.e. the speaker), thus making the sound less smeary, and more focused in one spot on the mic.

2. There is no platform to diffract or reflect sound coming off the speaker. In theory, this should result in even better sound than I got with the Gramma. Also, it fits wider amps than the standard Gramma.

I do like the Gramma and I think it works pretty well, so if this is an improvement, great!
 
Last edited:
I look forward to reading your comments once you have the Isoacoustics stand and try it out for a while.
Thanks for your input.
 
You don't need a new stand, Les.

Just move outdoors! The snow makes a wonderful de-coupling media. It even dampens the ambient sounds of the woods!

sg39c.jpg
 
Back
Top