[alanwcruz]

Nice how did you scan it ?

Photogrammetry, the secret is giving contrasting color to the texture on your impressions. I used green and black chalk paint. Got great results.

 

[alanwcruz]

Oops, double post.

 

[528367]

 

[Bassiklee]

You don't need the red damper with the Accupass loaded 38** drivers.

 

[tomekk]

You don't need the red damper with the Accupass loaded 38** drivers.

Correct. (acustic) Damper is built into the speaker 2mm x 12-14mm 2354 Green/or Brown/or White damper with one cap 2,2-10 uF, full coil. Sonion 38D1XJ without damper 2mmx16-20mm. Probably reverse polarity 38D1XJ. Do not use 2x 2354 in parallel, you will reduce top peaks 5-8-10kHz.

 

[528367]

 

[eunice]

Thank you so much for the help.
One last question please.
I can't understand what uf does 4.7uf for example reduces the low frequencies and 470 uf for example reduces the high frequencies ? I want to cut completely the frequencies above 200hz to the 38D1X.

Depends on how you wire it and the cutoff frequency is depending on driver impedance.
Google RC Filter calculator for online calculators.

 

[528367]

 

[eunice]

Very roughly yes. Reality is - as it is often - much more complicated. For once there is no such thing as a clear cutoff frequency. It is always a slope, with simple filters it is a pretty shallow slope, higher order filters have a steeper slope but require more components. Also using the DC resistance only gives you a ballpark value, the driver has different resistance depending on the frequency (reactance is the better term for this frequency depending resistance).
Long story short: use the values you calculated as a starting value for tuning by ear/measurements. Don’t be surprised if your final values are way different.

 

[528367]

 

[Bassiklee]

Your 38D1X really doesn't need any additional filtering. That's its biggest selling point.

 

[BigBublik]

Friends, please advise the length of tubes and the location of damper in a pair ED-29689 and CI-22955?
I want to warm sound.

 

[528367]

 

[528367]

 

[tomekk]

I must use 24ohm resistor and a 33uf capacitor and it will be 200.95 hz cut off " frequency low pass filter .this for the 38D1X

Too low lowpassed driver will cut off much of the scene. I'd do a rolloff falling about 1 kHz, which is full range 38D1X. 200 Hz That's a good idea if you use another full range driver.

For the 2354 using a 220nf capacitor at 4 ohm dc will cut the bass frequencies from 180.86 hz and below.

2354 I would do a rolloff rising about 2kHz, with filtering below. 200nF cuts off the driver probably something around 8-10 kHz.