1999-2009 [Subscribe to Daily Digest] |
 | [Main 95 Bulletin Board | BBFAQ |
Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Do you have the specs of the 9 H-K speakers ? Posted by Peter [Email]  (#2804)  [Profile/Gallery]
(more from Peter) on Mon, 26 Feb 2001 05:54:18
In Reply to: Re: Do you have the specs of the 9 H-K speakers ?, Göran Larsson, Fri, 9 Feb 2001 11:44:03 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Gents,
Actually the reason for the somewhat odd values for impendance for the speakers are due to the simply reason of signal adjustment. For instance, the center speaker has a higher impendance(5,9) than the Front Left/Right speakers(2,5), thus decreasing the output from the amplifier for this specific channel, otherwise the center speaker would mess up the soundstage. It is common practise to adjust the signal levels individually for each channel on the amplifier, but since these speakers are custom made for use in this specific system and car, You might just as well design the speakers influence the output from the amplifier, it's easier! The same reason for all the speakers is applied as You all can see when studying the numbers: The reference signal is coming from the Front Left/Right speakers on the dashboard, the center channel is adjusted in reference to those speakers as well as the Front Door speakers, which are adjusted to a slightly higher output in order to meet up with the dashboard speakers fitted higher up, closer to the listeners ears. The same applies for speakers in the back region of the car(which some people mistakingly believe are fitted for the passengers entertainment, but are simply there to broaden and better the soundstage in the front of the car!!). It all comes down to Ohms law(P=U*I, or P=(U*U)/R). Let's say the nominal voltage is 12 Volts, this means the Front Left/Right speakers would see P=(12*12)/2,5 = 57,6 Watts and the Center speaker would see P=(12*12)/5,9 = 24,4 Watts. Ofcurse this is extremely generalised, but I hope You get the picture! Since all amplifier's output power is actually rated in relationship to the actual impendance they see on the output channel, this has a big impact on the amount of power the amplifier is able to load into the speaker.
In an aftermarket system, the speakers will probably all have the same nominal impendance(usually 4 ohms), and You are left with the possibility of adjusting(gaining) the signal levels on the amplifier. On top of this, a speakers impendance is actually not statis, but varies depending on the frequency it's actually playing. Now ofcourse this can also be adjusted/compensated, but that's a whole different chapter.
Are You confused enough now?
, Mon, 26 Feb 2001 05:54:18 <-- Viewing This Message
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
