About a series capacitor with closed-box loudspeaker

[Freedom666]

Don Highend made a reflex loaded high pass filtered fullrange system with Visaton 8cm driver SL87FE

https://www.donhighend.de/?page_id=10183

 

[freddi]

hornresp and its passive filter utility sorts 3rd order boxes quickly. Here's an Eminence Omega Pro18A in 80 liters box- 56.6 liter might be better.

My soon to be run boombox has a GRS 10PT for its point on channel

 

[perrymarshall]

Closely related thread I started a year ago: https://www.diyaudio.com/community/...boost-4-to-7db-w-passive-xover-no-dsp.404171/

 

[freddi]

GRS 15PT looks good in a 70 liter box with 420uF 2.83v 2pi

 

[jayme]

How does this work? Does the big capacitor make it easier for the amp to manage big current demands more quickly for these low freqs?

 

[Galu]

How does this work?

The capacitor increases the voltage applied to the driver over a range of audible frequencies below its frequency of resonance.

The full physics is in the "Subwoofer tuning with capacitor in series" section of this article: https://www.lautsprechershop.de/hifi/aka_tief_c_en.htm

 

[freddi]

I've a spare GRS 12PT - tho heavy it should be usable in a 35 liter 3rd order box for a 2.1 boombox