Timpelay - NR200CH

[Timpelay]

It's about time we put two NR200P in stereo.

 

Idea:

Build bookshelf sized stereo speakers using Masterbox NR200P cases.

 

Hardware:

• Case - NR200P
• Tweeter - Focal Flax Evo TAM tweeter (Aluminium/Magnesium ‘M’-profile inverted dome tweeter)
• Woofer - Focal Flax Evo PS 165 FXE 6½" (165 mm) 
• Filter - Focal Adjustable Crossover 12-18dB/oct @3kHz
• Cables - Oehlbach Twinmix One 3 mm²
• Terminals - Dayton Audio BPA3-8 Gold

 

Sponsors:

AAMP Nordic (Supporting with Focal)

Cooler Master (NR200P was sponsored in an earlier stage for previous projects and now disassebled and reused for this project)

 

 

 

 

 

 

 

 

 

 

 

 

Edited December 21, 2022 by Timpelay

[Timpelay]

I will be working towards these three pilars doing my best to compromise in the best possible way.

• Aesthetics 
• Sound quality
• Versatility

Since I'll be building powerful speakers using a thin steel case to start with, it will be difficult to deal with vibrations and dynamic pressure.

 

Design:

The case will be standing on its backside, with the top used as speaker front.

I've decided to use dual tempered glass side panels to create complete see-through speakers, this is no ordinary MDF speaker.

I will design my own bass reflex port for the back of the speaker with the possibility to fine tune it.

Overall the NR200P design will be kept as much as possible which makes it more challenging but also more fun.

Speaker feet is still under consideration. One idea is to use the original case feet for a complete NR200P design, but since they are made of plastice I have second thoughts...

[Timpelay]

One of the benefits with using Focal speakers is that they supply technical sheets for all their products.

Helps alot to have those mechanical drawings to model my replicas after instead of measuring myself.

 

  

 

I will model the entire speaker and the parts I'm using from the NR200P case to get it all together as a 3D model.

Then I'll fabricate all the pieces and assemble them. At first only by mechanical solutions but when I got it all figured out final assembly will probably include glue/sealant.

[Timpelay]

Woah, two wild NR200P appeared!

 

 

Pretty cool to have them stacked actually. But stereo won't work that way 

 

 

More something like this.

 

Fronts up the chassis is pretty much perfect in size for a bookshelf speaker/studio monitor.

 

[Timpelay]

Mmh some different hardware goodies compared to all computer parts that go through my workshop.

 

It took me many hours founding the speakers I wanted, and I'm really happy unboxing these beauties.

The Flax cone of the woofer is really something.

 

 

 

[Timpelay]

Lets go! 

 

This project will require alot of 3D-modeling. I'm planning to model pretty much the entire speaker assembly and parts of the case I'm keeping.

 

 

I'll start with the speaker element assebly.

It will be a sandwish type built by many layers, each one doing something visual or structural.

My idea is to not have any visual screws at all exept on the back side. This will require proper planning and step - by - step assembly.

 

Acrylic panels will be laser cut and other parts 3D-printed.

 

 

[Timpelay]

The "Bass Ring". Connection ring between inner case and subwoofer element.

Will also work as fastening plate for the woofer.

 

The only 3D-printed part in the front of the speaker.

 

 

Printed and equipped with these wonderful Ruthex brass M4 threaded inserts.

 

 

 

 

Edited October 27, 2022 by Timpelay

[Timpelay]

More parts modeled and ready for printing!

 

First up is the cable terminal.

 

 

The bass reflex port will be a two-part assembly with the large internal pipe and the backside port.

 

 

 

[Timpelay]

Front pieces ready to be laser cut.

 

 

Woofer assembly with the 5 mm mounting bracket and 3D-printed transfer ring in beautiful purple.

 

 

 

Front piece in 8 mm with neoprene rubber stripes filling the gap against the frame.

 

 

Woofer fits with a couple of millimeters between those front parts of the frame.

The assembly is mounted as a clamp with guidance holes in the 5 mm bracket securing it to the steel frame.

 

 

The front is mounted from the inside securing the woofer bracket and frame into a solid assembly.

 

 

First part done and now off for some interior panels.

 

 

[Timpelay]

The assembly process continues with front and bottom internal parts.

My whoe idea is to use as few screws as possible and design the parts to look them selves in pace together with the steel frame step by step.

 

Also here, a sneak peek of more parts to come.

 

 

I will make the inside with white sheets to get som light there. The tempered glass side panels are tinted and will naturally make the inside a bit darker.

 

 

Woofer transfer ring fits perfect flush against the inside front sheet. When mounted it requires some force and then stays solid in place. If nesessary it can be glued together later.