NAKAMICHI reference slimline monitors woofer retrofit....

[ching0n]

I acquired a pair of these about 2 years ago and have been trying to get them closer to or better than factory specs. Unfortunately there is absolutely nothing online about the speakers. From the drivers' mounting plate model I was able to decipher that there was a Mitsubishi/Diatone connection at some point and that's where these came from.

The closest info I can find is that they are modified/cloned DIATONE 2S-208's (using same drivers and similar enclosure topology (I think the naka's have more volume).

Unfortunately for me, these were missing the woofers and they are made of unobtanium. I'm attaching relevant specs for the diatone (will have to measure mine to see if enclosure dimensions match), and driver charts. What I'm trying to do is get drivers that will get me close to or (even better) exceed the manufacturers specs. I am quite a noob at this and don't quite know if I should be looking for woofer/or mid-woofer. I was told the tweeter was not much to write home about, so if there's a better unit out there that's reasonably priced, I'm willing to give it a try.




System 2 ways and 2 speaker baffle
Use unit etc. For low-pass: 20cm corn type (PW-201)
For high regions: 5cm corn type (TW-501)
Network: 3 - 4micro F MP capacitor
Impedance 16ohms
Rated input 10W
Simple sound continuation: 3W
Low-pass resonance frequency 60Hz (speaker for low-pass)
Play frequency band 60Hz - 15000Hz
Crossover frequency 2000Hz
Output sound pressure level 100 dB/VA (with 50cm)
Dimension Width 260x height 350x depth of 103mm (all the longest part)
Weight 3.5kg


System Corn type Woofer unit
Aperture 20cm
Impedance 16ohms
Rated input 10W
Low-pass resonance frequency 60Hz
Play frequency band 60Hz - 2000Hz
Output sound pressure level 100 dB/VA (with 50cm)
Effective oscillating radius 7.8cm
Equivalent mass of a vibration system 12gr
Equivalent Qo of a vibration system 0.5
Voice coil diameter 3.6cmphi
Magnetic flux density 9000gauss
The total magnetic flux 15x104maxwells
Permanent magnet 40phix35
The diameter of baffle opening 180mm
Dimension Diameter 202.4x depth of 123mm
Weight 1.8kg



System Corn type tweeter unit
Aperture 5cm
Impedance 16ohms
Rated input 10W
Simple sound continuation: 3W
Low-pass resonance frequency 2000Hz
Play frequency band 2000Hz - 16000Hz
Output sound pressure level 100dB/VA
Effective oscillating radius 2.0cm
Equivalent mass of a vibration system 0.37gr
Voice coil diameter 1.6cmphi
Magnetic flux density 12000gauss
The total magnetic flux 5.9x104maxwells
Permanent magnet 25phix15
The diameter of baffle opening 47mm
Dimension Diameter 700x depth of 48mm
Weight 0.25kg








I went with the following driver: Orange line above, however I think it's a little shrill on the upper midrange i'd say 2khz+. Is that what I see in that spike on the graph? How would I got about flattening it before making it roll off like the stock diatone woofer? Should I just make it roll off and make the tweeter take over?

[ching0n]

it seems like i can't edit my post; here are the missing pics: