Plate Reverb pre EQ Issue

[RoadrunnerOZ]

Ecoplates had stainless. If you think Ecoplates had cold rolled steel please post a source.

The original plate was cold rolled or stainless:

 

[RoadrunnerOZ]

@RoadrunnerOZ "the thinner the plate material needs to be but the more air resistance damping comes into play." What does it mean?

"so as it seems you’re planning on using springs" I must say that I have not.

Air resistance to movement will have a greater back effect on the lighter material so ring time is reduced - the input signal is short but the plate ring-on time is dependent on the mass of metal moving and the factors that impede that movement - as it has a large surface area the air damping factor is considerable.
As far as the springs go you posted a video of the construction of a plate which I assumed patterned what you were going to build - post #61 - that construction uses springs - shown at 02:00.

 

[Sounddesign84]

Air resistance to movement will have a greater back effect on the lighter material so ring time is reduced - the input signal is short but the plate ring-on time is dependent on the mass of metal moving and the factors that impede that movement - as it has a large surface area the air damping factor is considerable.
As far as the springs go you posted a video of the construction of a plate which I assumed patterned what you were going to build - post #61 - that construction uses springs - shown at 02:00.

That was before the alchemical secrets of Hermes were revealed to me. Now I can see more clearly what needs to be done!

 

[Sounddesign84]

Do I need to investigate the quality of the electricity that comes out of the sockets in my house? I live in an old building...

 

[Sounddesign84]

This design from here

https://groupdiy.com/threads/building-a-real-plate-reverb-drawings.34153/

Looks to me like a build I saw of a guy that made a Le Mans car, beautiful.

 

[Sounddesign84]

I have trouble deciding between the bigger and the smaller size, for the bigger my worries is:

1# Dampening, is good/bad is dampening with a towel? How advanced is the construction of the dampers in relation to the rest of the construction, and to go without damper then maybe the smaller will be more suited for music production since it has shorter decay.

2# For the bigger size I guess the steel frame tubings will be more difficult to drill and cut.

 

[jazzcrisis]

I have trouble deciding between the bigger and the smaller size, for the bigger my worries is:

1# Dampening, is good/bad is dampening with a towel? How advanced is the construction of the dampers in relation to the rest of the construction, and to go without damper then maybe the smaller will be more suited for music production since it has shorter decay.

2# For the bigger size I guess the steel frame tubings will be more difficult to drill and cut.

Bigger. If you want it to really sound good, you need to be in the ballpark of EMT, Ecoplate, etc. size. Otherwise the resonances will be too prominent in the midrange. I have experimented with this directly. Steel or similar frame is a must for the amount of tension required. It isn't terribly difficult to work with.

 

[Disco Volante]

Not sure what M-12-O is - Im semy joking, there is a supplier that ask what quality I need the sheet to be in. So I asked him for cold rolled and stainless and he still asks me what quality/kind so to specify exactly I would need to give him a type number in order for him to give me quotes.

25 mm it is then.

stainless comes in several qualities, 304, 316(L) (in order of stainlessness). 316 is the hardest. There are other denominations, like 1.4301 (roughly eq to 304) and 1.4404 (eq to 316L). 304 is basically less acid resistant.
I surmise the resonance harmonics would be higher the stiffer the material is.
If you want to roll a 0.6mm sheet, be sure to make a large roll, and be prepared to counter-roll it once it's in place..
I would not recommend it. We recieve all our sheet material in flat-packs and store them flat.

 

[RoadrunnerOZ]

Do I need to investigate the quality of the electricity that comes out of the sockets in my house? I live in an old building...

Only if you decide to wear an aluminium foil hat to ward off alien radio transmissions. Good luck with that one…..

 

[RoadrunnerOZ]

I have trouble deciding between the bigger and the smaller size, for the bigger my worries is:

1# Dampening, is good/bad is dampening with a towel? How advanced is the construction of the dampers in relation to the rest of the construction, and to go without damper then maybe the smaller will be more suited for music production since it has shorter decay.

2# For the bigger size I guess the steel frame tubings will be more difficult to drill and cut.

In the Ecoplate the damper used was made from Owen’s Corning acoustic ceiling panel and supported in a 3/4” channel frame almost the full size of the reverberation plate - see fig.4 of the construction drawings. The proximity of the damper reduces the ring time by damping the movement of the plate through air back pressure. The whole damper frame assembly is swung in towards the plate at a uniform distance to increase damping effect. I don’t think a towel is going to do much.
Steel box section is easy to cut and drill.
If your metal sheet is transported flat in Corflute (taped either side of the metal sheet to prevent kinks and creases) you should be able to manoeuvre it as a flat pack (maybe with some minor bending) around and up a staircase over the bannister. I’ve done this with full sized solid core acoustic doors and large sheets of 8mm and 12mm glass in some studio builds I have done. Corflute comes in lots of different sizes - 2400 x 1200 x5mm is a standard size - it’s tough, semi rigid but a little flexible and can be cut with a box cutter:

 

[RoadrunnerOZ]

There are plenty of YouTube videos of the damper plate assembly of the EMT 140 working to clarify what it does. It’s a simple enough mechanism but would take a bit of work to design and construct/fit to the frame of the plate.

 

[RoadrunnerOZ]

 

[Barry Farmer]

I built one for Pathway Studio, in London. Similar to those detailed but I used ceramic pickup cartridges on the edge of the plate - which worked OK, plus a Goodmans Vibrator as driver. It was used on countless recording sessions including Nick Lowe, Elvis Costello, the Police, the Damned, Curved Air to name a few. Plate was housed in the office and we'd have to ask for quiet when we were mixing!

 

[RoadrunnerOZ]

The first studio I helped build in 1977 had an EMT which was upstairs in the office in its own little soundproofed room with the cables going straight down through the floor into the control room below. I had to damp the stairway as it was Jarra timber (very hard) treads on a steel beam framework, rang like crazy and would feed into the plate and the live room when people went up and down. The soundproofed room under these stairs ended up as a great little reverb chamber for vocals and snare and sax.
We also had a long concrete pipe with a speaker at one end and an SM57 on a wire pulley as a delay/reverb unit although this was soon replaced by electronic units.
There are plenty of high quality acoustic guitar piezo pickups available that are suited to this application and matching preamps are available for a lot of these.