[pace88]

I also have two component silicone but it’s more expensive and kinda Messi (brand is trollfactory)

Agar-agar is plant based and is also used for cooking, you can get it in the grocery store. To turn it into the impression material you need to add glycerin, the recipe is somewhere here in the thread.

If you have a dreve shop they will sell you the impression material too. Maybe it’s easier for the start to go with that.

additionally
two-component silicon (transparent) is very good for molding, its strength is very strong, it will tear and will survive in the same time without significant shrinkage, in my opinion it is a patent, for agar2 types it will shrink at certain periods more easily torn compared to the type of silicon, the excess he can be melted back, so in my opinion get it so that maybe from dreve or similar products or you make your own DIY (gelatin)

 

[Kulgrinda]

Thank you @Kulgrinda, I just want to confirm when you say "low-pass" does it mean that it Filters high freqs so low freq can pass, right? As far as the project I guess I will have to figure out how to add the acoustic foam or damper. The holes of the 3D printed acoustic structure look smaller than a damper, judging by the pictures, I will have to investigate.

That is correct. Filter's naming is self explanatory - "low-pass" would cut higher frequencies and let the low frequencies pass by.

There are different diameter filters available from Knowles. Firstly I would suggest stuffing the high frequency sound bore with a piece of acoustic foam or wool just to check if effect is noticeable. If a filter gets stuck you won't be able to pull it away. Of course with wool you will not get that consistent result as with a dedicated filter, but for testing purposes it is fine. I managed to tame some overly enthusiastic high frequencies in some KZ earphones with acoustic foam.

 

[stephensynanta16]

Just finished a set of universals using the RAB 32257 design by dhruvmeena and Choy Wei De. I wanted to build something inexpensive to use with a Bluetooth adapter while at the gym or climbing. This is only the second set of universals I've built. Previous builds include three iterations of customs with Knowles GV, one universal with GV for my girlfriend, and a B6 + zobel ciem that I'm currently working on.

I think these sound great for a sub-$100 build. Bass reproduction is lacking a bit and treble could use a bit more taming to prevent fatigue. Overall, the quality for price is amazing and the work put into the zobel and tubing (dhruvmeena & Choy Wei De) for this is very impressive.

Following Choy Wei De's post for the tubing didn't take much time at all and I was able to finish it within 20 minutes. The zobel took a bit longer just because I was working with 0805 & 1206 size parts. I used uv solder mask to protect the joints and prevent shorts when compressed into the very small shell. The shell I used was perfect for this build, which is nice because I couldn't fit anything larger into them.

I think they turned out pretty nice and I'll definitely feel more comfortable using them at the gym than my customs.

Hi, nice shell u got there. Where can i find that kind of shell?

 

[Lucas Taboada]

Hi, I know this its kind of stupid. I confused myself with many variations of RAB-p tubing.

Does anyone has the final version of RAB-p tube length?

Hi, this is what I have in my notes, but I don't know if its the final version, I'm a bit confused too

RAB-P
Resonator(shifted near horn, for less tube effect)
1.2mm ID 2mm OD(6.5mm length from spout)
2.0mm ID 3mm OD(1.0mm length, Resonator, Buffer Mouth for horn)
1.2mm ID 2mm OD(2.5mm length)

Horn
2.0mm ID 3mm OD(2.5mm length) -> White Damper
3.0mm ID 4mm OD(3mm length)

Zobel circuit
Cz = 4.6uF
Rz = 41ohms

Series resistor 20ohms

 

[dhruvmeena96]

Noble Savant with zobel on ED29689 sounds way too good. Actually too good for its own good

 

[pace88]

#SHARE
hand box grinding(supporting tools)
my project uses 3mm acrylic material with snapfit / puzzle pieces

box hand spec :
-Lenght 40cm
-Widht 25cm
-Height 15cm
-Hand hole 9cm

fan spec :
-12,5cm X 12,5cm
-25watt
-4000rpm max speed

Led
-Lenght 37cm
-6watt

dust bag :
-karcher filter blue

-cuff

unfortunately can not share video to see the performance of this box , it works really really well , happy

 

[Squirg]

#SHARE
hand box grinding(supporting tools)
my project uses 3mm acrylic material with snapfit / puzzle pieces

box hand spec :
-Lenght 40cm
-Widht 25cm
-Height 15cm
-Hand hole 9cm

fan spec :
-12,5cm X 12,5cm
-25watt
-4000rpm max speed

Led
-Lenght 37cm
-6watt

dust bag :
-karcher filter blue

-cuff

unfortunately can not share video to see the performance of this box , it works really really well , happy

Love this! Thanks for posting. Been procuring supplies for this project for a while and it's nice to see it broken down like this before I get started. Also nice to see a fellow cycling junkie in the DIEM community!

 

[tomekk]

@pace88 That's my boy!. Health first. I also propose a mask to use preventively and necessarily nitrile gloves. Touching liquid acrylic and isopropanol can cause dermatitis. Always read material safety data sheet, guys.

 

[Caluub]

Hi, nice shell u got there. Where can i find that kind of shell?

https://www.aliexpress.com/item/32873071827.html?spm=a2g0s.9042311.0.0.29a84c4dANkde7

 

[Caluub]

#SHARE
hand box grinding(supporting tools)
my project uses 3mm acrylic material with snapfit / puzzle pieces

box hand spec :
-Lenght 40cm
-Widht 25cm
-Height 15cm
-Hand hole 9cm

fan spec :
-12,5cm X 12,5cm
-25watt
-4000rpm max speed

Led
-Lenght 37cm
-6watt

dust bag :
-karcher filter blue

-cuff

unfortunately can not share video to see the performance of this box , it works really really well , happy

This is fantastic. I wish I had the means to cut the acrylic like that.

 

[pace88]

[QUOTE = "pace88, posting: 15169104, anggota: 489596"] # SHARE
hand box grinding (alat pendukung)
proyek saya menggunakan bahan akrilik 3mm dengan potongan snapfit / puzzle

kotak tangan spec:
- Panjang 40cm
-Lebar 25cm
-Tinggi 15cm
-Lubang tangan 9cm

spesifikasi kipas:
-12,5cm X 12,5cm
-25watt
Kecepatan maksimum -4000rpm

LED
- Panjang 37cm
-6watt

kantong debu:
Filter biru-raja

-manset

sayangnya tidak dapat berbagi video untuk melihat kinerja kotak ini, ini berfungsi dengan sangat baik, senang [/ QUOTE]

This is fantastic. I wish I had the means to cut the acrylic like that.

This is fantastic. I wish I had the means to cut the acrylic like that.

This is fantastic. I wish I had the means to cut the acrylic like that.

You can use laser cutting services, it will be difficult if done manually, especially if you are aiming for a precise size, I deliberately make snapfit pieces to lock and glue the corners, so that the dust is completely trapped inside there, I'm waiting for the filter hepa on my way to maximize filter performance

 

[dhruvmeena96]

I have this question
@piotrus-g @Everyone

What will happen if we use center tap with Knowles CI-22955?

I haven't tried yet but from what I know, center tap will reduce bass and increase upper mids and treble.
And what are we going to see in inductance and impedances as center tap is like going half coil.

I just want to confirm plus want to get an idea on how center tap on CI sounds like

 

[eunice]

DC resistance is going to be half, but inductance is not going to be exactly half, as the rest of the unused part of the coil should act a little like a core in an inductor. Don’t think that effect is very strong, but it should be measurable. I am still waiting for a device to accurately measure inductance to arrive, all I have where not really capable of measuring the inductance of BAs.

 

[Choy Wei De]

Hi, this is what I have in my notes, but I don't know if its the final version, I'm a bit confused too

RAB-P
Resonator(shifted near horn, for less tube effect)
1.2mm ID 2mm OD(6.5mm length from spout)
2.0mm ID 3mm OD(1.0mm length, Resonator, Buffer Mouth for horn)
1.2mm ID 2mm OD(2.5mm length)

Horn
2.0mm ID 3mm OD(2.5mm length) -> White Damper
3.0mm ID 4mm OD(3mm length)

Zobel circuit
Cz = 4.6uF
Rz = 41ohms

Series resistor 20ohms

Thank you so much!

 

[dhruvmeena96]

DC resistance is going to be half, but inductance is not going to be exactly half, as the rest of the unused part of the coil should act a little like a core in an inductor. Don’t think that effect is very strong, but it should be measurable. I am still waiting for a device to accurately measure inductance to arrive, all I have where not really capable of measuring the inductance of BAs.

I just want to lower the bass boost and get some upper mids boost.

I am going with

CI-22955 woofer
CI-22955 midrange center tap
ED29689 upper midrange center tap