Someone was asking for new pictures of builds some pages ago. Here’s one. My MASM 3 pro. (K is my initial)
Nice work
I think you made the shell so sexy that the cable seems to look as a weak point. LoL
You need to have the cable thicc
(That was a joke)
Nice work
Well, this for new members
Rules on making own style MASM.
1. Select driver from the low impedance RAB/RAF(RAB32033/32257/32063 or RAF). Its because its low sensitivity and peak at 3kHz. This driver runs without damper and assist the higher sensitivity , very low impedance driver in completing the spectrum of sound.
2. Now, second driver has to be a driver having high sensitivity, lower impedance than RAB and frequency peaks at 2kHz and 4kHz. This driver is dual damped.
First damper is strong damping to remove internal peak creation at spout due BA 4th order/6th order structure. Type of resonance damping
Second damper is slightly more calculation based.
Since I chose a 20mm tube for GQ in MASM
The open tube resonance occurs at 8.5kHz
Why?
Simple
Keep everything in meters
Lambda = 2(length of tube)
Frequency of node{highest} = v/Lambda
This gives us 8.5kHz peak
So having a weak damper just at the center of the tube, something like grey, will shoot down the 8.5kHz nodular resonance and also its other peaky harmonics in higher frequency.
That's the reason for dual damping GQ.
3. Now RAB has 16mm tube and GQ(or other driver) has 20mm tube. RAB compensate for any over loss due to damper on GQ because its kept damper less. The effect of RAB on upper midrange and treble is non obstrusive and it helps to raise the treble too.
4. Zobel to flatten impedance down
For GQ or alternatives
First damper - at beginning to reduce driver internal resonance and major peak
Second damper - in center - to reduce tube resonance, so I can get my treble lined up properly without sharp peaks
In MASM 3 pro, I have a series resonator/muffler/acoustic cavity low pass. It was introduced to not actually low pass, but shift my resonant peak and 3kHz slightly to left(higher freq).
With 16mm tube on RAB, I get 1st order resonance at 10,625Hz, which has been proven by RAB FR. Adding a resonator, shift the 10,625Hz to 11,250Hz with wider kurtosis and 3,000Hz to 3,085Hz