Home Theater DIY (Loudspeakers, Amplifiers and HTPC) - Part 2Este artigo também foi publicado em português e pode ser acessado aqui.
Continuing updating this series, I’ll talk about the subwoofer that I built to enhance the system. The addition of a bass unit is always welcome, especially for movies. For music, however, it is dispensable considering that the front speakers - as I will be calling the bookshelf speakers from the previous post - have a great bass response for 6” midbass drivers.
Here it is the brief post I made about the subwoofer in the CLUBE DIY ÁUDIO group on Facebook:
Tiago Medicci Serrano January 20, 2017
Good afternoon friends!
Here are some photos of the subwoofer I built with the Questo QS250A-12SVC4 12” speaker.
I built a vented box with 64 liters, two 2” diameter x 21cm vents. The box was simulated using the program BassBox and the tuning frequency was then evaluated by ear, staying around 26Hz. The box was built using 30mm MDF (two 15mm sheets overlapped) - with internal reinforcement. The baffle is recessed in relation to the front dimensions of the box so that the front screen could be fitted and thus I did not need to make the speaker recess. The front speacker protection screen is fitted with neodymium magnets, making it easy to remove. The final finish was done with “screened” fabric (known in Brazil as “telinha”) - it provides a sophisticated look when used with the front screen. For now, it is being powered by a ~60W RMS Gainclone (at 4 Ohms).
The unit makes all the difference in the system, especially for movies! Thus, I am completing a totally DIY 5.1 system with six GC amplifiers, front bookshelves inspired by Akron Spalla (with Akron speakers), rear and central Mini Books by laserkit.
See you!
As I’ve said in this post, I already had two other components of the system that I will soon post here: the side and central speakers and the Gainclone amplifiers. However, the media center was still missing. I will post about these components soon 
Stay tuned for news!
Part 1 of this series can be accessed here.