diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Full Range (http://www.diyaudio.com/forums/full-range/)
-   -   NS3 "PC Speakers" (http://www.diyaudio.com/forums/full-range/224610-ns3-pc-speakers.html)

michiu 29th November 2012 05:33 PM

NS3 "PC Speakers"
 
Hi all, I'm putting together something similar to the 4" cube PC Speakers done by Wolf as one of my first projects.

It uses the Aurasound NS3-193-8A in line with a 500uF cap. What I'm struggling to understand is the purpose of the cap. From what I know, its acting as a high pass that has a cutoff frequency of ~40hz.. what is the benefits of that?

planet10 29th November 2012 05:48 PM

Personally i am not a fan of an in-line cap on a sealed box. AFAIK it is to flatten the response of a too-small box. If i was faced with too small a box i'd make it aperiodic.

Since i am averse to electrolytics, the film caps to do 500 uF would be way more expensive than the driver, and take up as much space as the box.

My NS3 were in about a 1.5 litre box, they worked fine.

dave

michiu 29th November 2012 06:40 PM

Quote:

Originally Posted by planet10 (Post 3262867)
Personally i am not a fan of an in-line cap on a sealed box. AFAIK it is to flatten the response of a too-small box. If i was faced with too small a box i'd make it aperiodic.

Since i am averse to electrolytics, the film caps to do 500 uF would be way more expensive than the driver, and take up as much space as the box.

My NS3 were in about a 1.5 litre box, they worked fine.

dave

Many thanks for the numerous tips you have given me.

The response of your 1.5L NS3 was acceptable without a filter? Would this be an aperiodic or a sealed box that you put them in?

planet10 29th November 2012 06:44 PM

Performance was acceptable. Bass is one thing the NS3 has no lack of (for a 3")

The box is sealed.

dave

tuxedocivic 29th November 2012 07:28 PM

Yup, scrap the cap. Especially if your computer is your source.

sreten 29th November 2012 07:56 PM

Hi,

There is nothing wrong with the principle on an inline capacitor for
sealed. It works well if done properly but its severely not fashionable.

For a FR you should be looking at a capacitor consisting of multiple
parallel types, and I'm not going to suggest values and types, only
to be pointlessly argued with by a bunch of component fascists.

rgds, sreten.

Melo theory 29th November 2012 07:59 PM

haha!
awesome.
:)
(I mean....brilliant)

tuxedocivic 29th November 2012 08:05 PM

Hi Streten, my current two way has 5 caps in it. I'm far from a component fascist. But how does putting a cap in series help this system? It's hooked up to a computer. If he needs the high pass, the computer can do it. If he needs bass boost, the computer can do it. The computer can do anything a cap can.

sreten 30th November 2012 09:50 AM

Hi,

You can model it in the demo version of Basta!.

Here is one implementation explaining the principles :
http://www.humblehomemadehifi.com/do...20Box_copy.pdf

The fairly high Qts NS3 should be ideal for the technique.

Note that the capacitor improves the bass response and
adds some subsonic filtering which is always going to be
useful with such a tiny driver, even with AV fitering.

An interesting option is a single rail power amplifier and making
the speaker capacitor also the amplifier output coupling cap.

rgds, sreten.

JefffromMN 6th August 2013 04:38 PM

How does the function of this capacitor differ from the filter (L-pad and resisotor) Paul uses on his Sprite boombox with this driver (or it's Dayton twin)? I am contemplating building a sealed boombox with the pc speaker design and am now confused about whether to filter or not.


All times are GMT. The time now is 10:20 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2