Thread: RPG Modex™ Plate

(deleted)

Hi professor.
I have also heard great things about the Modex Plate.
Have you bought it ?
If not: Will you buy it?
And what other acoustic products do you have or are you planning to buy ?
Do you have any photos of your room to share on this forum ?

Having two, initially, 35Hz Modex plates delivered tomorrow, I will post my thoughts and some measurements ASAP.
Keith.

Have you tried entering your room dimensions into here?
hunecke.de | Room Eigenmodes Calculator

Keith.

I have 6 of them. They work great.

I recommend working out exactly the specific modal problems you want to address first. The modex plates are only effective if you place them in the right place in your room. They are also very expensive and, more importantly, difficult to hang on a wall. Once the plate is hung on the wall, you won't want to move it. A very good understanding of the modal peaks and dips at your listening position is mandatory before you order them, IMO.

There isn't a better bass trap I've tried and I've tried a lot of them. The other side benefit is that they don't absorb any HF. Oftentimes folks complain about bare fiberglass panels. They can be effective at wide band LF absorption, but also absorb way too much HF energy. This is oftentimes what folks are reporting as a "dead" or "overly damped" room sound. You could use as many modex plates as you wish and it probably would never make your room sound "dead" in the HF.

D Hi, what were your room's specific problems , and where did you end up placing the Modex plates?
Keith.

Originally Posted by Purité Audio

D Hi, what were your room's specific problems , and where did you end up placing the Modex plates?
Keith.

The issues were length axial modes. My room is 24' long and the room used to ring at 47hz and some harmonics of that frequency. The modex plates took care of that problem.

Originally Posted by dallasjustice

The issues were length axial modes. My room is 24' long and the room used to ring at 47hz and some harmonics of that frequency. The modex plates took care of that problem.

Coincedentally my room is almost a identical length ,with the commensurate frequency issue!
I am not sure how many panels I might ultimately need, or indeed how many I can get away with!
Did the subsequent measurements reflect the degree of absorbtion?
Keith.

Originally Posted by Purité Audio

Coincedentally my room is almost a identical length ,with the commensurate frequency issue!
I am not sure how many panels I might ultimately need, or indeed how many I can get away with!
Did the subsequent measurements reflect the degree of absorbtion?
Keith.

Yes. The room does measure better. I don't have the REW waterfalls anymore since it was a couple of years ago I started putting the plates in my room. When it comes to LF ringing I like using REW and focus on either the spectrogram or the waterfall. My personal favorite is the spectrogram. It's the easiest for me to see the LF ringing problems. The subjective impression I got before I measured was on the order of a radical bass improvement. It's like getting a whole new system. Pretty awesome! I hope you have some really good friends to help you put them up. I would get as many as you can, assuming you have space on the walls causing the ringing.
Michael.

We shall see how good my friends are when they arrive, I have been told by RPG ( UK) that they are most effective fitted flush to the wall, we have an older house with picture rails so that might be problematic .
I shall ask a couple of friends to hold them up whilst I measure!
KR Keith.

Just arrived, I see what you mean about size and weight!
Keith.

Placed next to my Cessaro horns which are over 8 feet tall.

Keith

Thanks for showing us the photo, Keith.
If you have ther RPG products too, please show photos of them also.

Dallasjustice: Do you have some photos of your room with your RPG products?

Originally Posted by PacMan

Dallasjustice: Do you have some photos of your room with your RPG products?

4 Modex Plates on frontwall, 2 on back wall. Backwall also has 3 large reinforced RPG BAD Panels offset 4" from wall and some additional tuned traps from GIK. The first picture also shows the sidewall RPG BAD panels and BAD curved. The curved BAD is reinforced and the top BAD panels are offset 4" from wall. I threw in some single shot REW measurements too. Hope you don't mind.

That is hardcore!
Even at 1/12 very flat FR!
In contrast I was ordered to cover ours in some 'Sanderson' fabric to match some cushions!
I will post some photographs once I have figured out how to wrap fabric around perforated powder coat!
Still enjoying the Mola-Molas I hope, I really like them, and am looking forward to the new dac.
Keith.

I love the Kaluga amps. They do it all in my system. It's really easy to forget they are there. I just leave them on all the time. Neutrality is not a sexy term. But when I'm trying to get my room and speakers to be as neutral as possible, it's really important that the gear is as neutral as possible.

The bass in my room is unheard by most. People who hear my system the first time are shocked with the bass. Bass is the final frontier!

Originally Posted by Purité Audio

That is hardcore!
Even at 1/12 very flat FR!
In contrast I was ordered to cover ours in some 'Sanderson' fabric to match some cushions!
I will post some photographs once I have figured out how to wrap fabric around perforated powder coat!
Still enjoying the Mola-Molas I hope, I really like them, and am looking forward to the new dac.
Keith.

Yes. I use a digital crossover in Audiolense XO. The graph follows my target curve.

Originally Posted by Davkj

Dallas,
Is the final graph with room correction? If not that is incredible!

I could easily add a turntable to my setup. In fact, Rob Robinson of Pure Vinyl uses the Lynx Hilo to play vinyl at audio shows. I don't have any interest in vinyl at this time. I may want to do some transfers later when I get the Merging Hapi but that's not a top priority for me.

I prefer a neutral sound so I can just hear the music. I am from the school of thought that the music stands on its own and mastering/recording engineers' errors are always a mere fraction of the distortions the playback chain introduces.

You or anyone else is welcome over anytime. I live 10 minutes from DFW airport.

Originally Posted by mep

Dallas-That's a boatload of room treatment you have there. I dare say you have more money invested in your room treatments than some people have in their entire systems. I also know you have invested a boatload of your time and money beating your room into submission with all sorts of DRC. Even though your system can only play digital source material, I would still love to hear what you have wrought with all of your hard work and the money you have invested in your room. It would be interesting to know if your idea of neutral translates to my idea of natural.

A flat frequency response just means that you are hearing the file,cd, vinyl as the artist intended, 'soul/emotion' is your response to the music,
I respect anyone who has gone to great lengths with respect to their listening room , IME rooms are sadly neglected whilst listeners are encouraged to purchase equipment which will not make any or very little difference to the sound quality.
Keith.

Originally Posted by mep

So are you in the business of selling room treatments or audio equipment? I thought you were an audio dealer.

The two are inextricably linked, but if your point is that most dealers would purely prefer to sell you ever increasingly expensive boxes ,without consideration to the room, then I would agree.
Keith.

Originally Posted by Purité Audio

A flat frequency response just means that you are hearing the file,cd, vinyl as the artist intended, 'soul/emotion' is your response to the music,
I respect anyone who has gone to great lengths with respect to their listening room , IME rooms are sadly neglected whilst listeners are encouraged to purchase equipment which will not make any or very little difference to the sound quality.
Keith.

Well said!

Great job, Michael.
I am sure the acoustic products improved the sound a lot.
Further more, my impression is that RPG is among the best out there (maybe the best?).

By the way, here is a video called acoustic panels effect.

MiniDSP, Trinnov and soon to be added Illusonic cover electronic room correction, we have just started to represent RPG and Spiers Robertson in terms of physical acoustic equipment.
Keith.

I believe RPG makes the MODEX Plate in Germany under a license. The price is very high but it's totally worth it. RPG makes the best room treatment gear and have legit testing measurements to back their claims. The others also have some good products. I also have MSR Springtraps, some auralex t'fusors and a few prime acoustic corner traps I've modified. I'm not a fan of the bare fiberglass panel. However, fiberglass can be modified to be very good.

Room treatments can be tricky. I personally made a lot of mistakes years ago when I first started with treatments. Unless one is very knowledgable about room acoustics, I wouldn't start buying treatments without first consulting a pro acoustician. The first thing he or she will do is get room measurements and construction materials to build a model. After that, one needs to measure the room with a mic. Room treatments are also a little like speakers. You want to get the highest performing gear possible since the areas to treat are limited.

MEP,

I only treat the areas where treatment improves the performce. I only posted pix of the treatments because PACMAN wanted to see some RPG. So, there many other parts not treated.

Originally Posted by mep

Looks like you have pretty much every square foot covered.

What have you done with your room?
Keith

Originally Posted by Purité Audio

What have you done with your room?
Keith

Is that MEPs room or an earlier iteration of your own Dallas?
Keith

Originally Posted by dallasjustice

Originally Posted by Purité Audio

Is that MEPs room or an earlier iteration of your own Dallas?
Keith

That's MEP's room.
KEF LS50 loudspeakers

Originally Posted by dallasjustice

I only posted pix of the treatments because PACMAN wanted to see some RPG. So, there many other parts not treated.

It is highly appreciated that you posted the photos: It shows us more clearly how your acoustic products are in a room, and it is interesting to see your choices (product placement etc.).
How many square feet (or in meteres) is your room?
My room is approx. 430 square feet.
Later this year, I will invest in Modex Plates (behind speakers) and other RPG products, too: Most likely Modex Edge (corner), BAD Arc (on a wall opposite to the "behind speakers" wall) and Absorbor (on the speakers' side walls). Currently, my room does not consist of any acoustic treatment products.
Attached is a photo of a Modex Plate.
The sketches are preliminary suggestions sent to me by a retailer selling RPG products.

Where is the seated position supposed to be? In the corner of the room?

My room is 14'6"x24'x9'3".

Originally Posted by PacMan

It is highly appreciated that you posted the photos: It shows us more clearly how your acoustic products are in a room, and it is interesting to see your choices (product placement etc.).
How many square feet (or in meteres) is your room?
My room is approx. 430 square feet.
Later this year, I will invest in Modex Plates (behind speakers) and other RPG products, too: Most likely Modex Edge (corner), BAD Arc (on a wall opposite to the "behind speakers" wall) and Absorbor (on the speakers' side walls). Currently, my room does not consist of any acoustic treatment products.
Attached is a photo of a Modex Plate.
The sketches are preliminary suggestions sent to me by a retailer selling RPG products.

Originally Posted by dallasjustice

Where is the seated position supposed to be?

In front of the BAD Arc products.

How thick will that wall behind the seated position be? Do you know which construction materials will be used with that wall?

It is a 3.5 inches thick gypsum wall.

First two Modex plated covered in cushion matching fabric, and just roughly installed.


Keith.

Other one,


Keith.