Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Equipment
Speakers
Active vs. Passive: An attempt by me to explain
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="alphakenny1" data-source="post: 1554420" data-attributes="member: 561605"><p>I’ve noticed there have been a lot of questions regarding the differences between active and passive crossovers. I am going to attempt to explain the differences between the two and also the advantages and disadvantages of both. I’m not going into a very detailed technical explanation, I just want a basic explanation for the people out there who don’t know the difference between the two.</p><p></p><p>Just some terms to know before reading:</p><p></p><p><strong>Low pass filter</strong></p><p></p><p>A low-pass filter is a filter that passes low frequencies well, but attenuates (or reduces) frequencies higher than the cutoff frequency.</p><p></p><p><strong>High Pass filter</strong></p><p></p><p>Exactly the same as a low pass filter but passes high frequencies.</p><p></p><p><strong>Bandpass Filter</strong></p><p></p><p>Is a combination of a low pass filter and high pass filter.</p><p></p><p><strong>Octave</strong></p><p></p><p>An octave is doubling the frequency. For example going from 50 Hz to 100 Hz is one octave. Going from 50 Hz to 200 Hz is two octaves, ect…</p><p></p><p><strong>Crossover slope or roll off (reference </strong><a href="http://www.bcae1.com" target="_blank"><strong>http://www.bcae1.com</strong></a><strong>)</strong></p><p></p><p>Crossover rolloff (or slope) describes the rate which the audio level increases/decreases per octave as the frequency increases/decreases. Usually a crossover slope is given as 6db/octave, 12db/octave, 18db/octave, 24db/octave, etc. If you want to see a visual of this here is a great picture:</p><p></p><p>Cyan = 6dB/octave</p><p></p><p>Red = 12dB/octave</p><p></p><p>Green = 18dB/octave</p><p></p><p>Violet = 24dB/octave</p><p></p><p><img src="http://i15.photobucket.com/albums/a356/misterassman52/xover.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>As you can see the different types of slopes and also notice that the crossover point is 1k.</p><p></p><p><strong>Crossover Point</strong></p><p></p><p>This is where frequency where the roll off or slopes starts to begin. As with the picture from above the crossover point is 1 kHz roll off begins at that frequency.</p><p></p><p><strong>2 way crossovers</strong></p><p></p><p>These crossover have two difference types of crossovers: Low pass filter and high pass filter.</p><p></p><p><strong>3 way crossovers</strong></p><p></p><p>These crossovers have three different sets of crossovers: Low pass filter, bandpass filter and high pass filter.</p></blockquote><p></p>
[QUOTE="alphakenny1, post: 1554420, member: 561605"] I’ve noticed there have been a lot of questions regarding the differences between active and passive crossovers. I am going to attempt to explain the differences between the two and also the advantages and disadvantages of both. I’m not going into a very detailed technical explanation, I just want a basic explanation for the people out there who don’t know the difference between the two. Just some terms to know before reading: [B]Low pass filter[/B] A low-pass filter is a filter that passes low frequencies well, but attenuates (or reduces) frequencies higher than the cutoff frequency. [B]High Pass filter[/B] Exactly the same as a low pass filter but passes high frequencies. [B]Bandpass Filter[/B] Is a combination of a low pass filter and high pass filter. [B]Octave[/B] An octave is doubling the frequency. For example going from 50 Hz to 100 Hz is one octave. Going from 50 Hz to 200 Hz is two octaves, ect… [B]Crossover slope or roll off (reference [/B][URL="http://www.bcae1.com"][B]http://www.bcae1.com[/B][/URL][B])[/B] Crossover rolloff (or slope) describes the rate which the audio level increases/decreases per octave as the frequency increases/decreases. Usually a crossover slope is given as 6db/octave, 12db/octave, 18db/octave, 24db/octave, etc. If you want to see a visual of this here is a great picture: Cyan = 6dB/octave Red = 12dB/octave Green = 18dB/octave Violet = 24dB/octave [IMG]http://i15.photobucket.com/albums/a356/misterassman52/xover.gif[/IMG] As you can see the different types of slopes and also notice that the crossover point is 1k. [B]Crossover Point[/B] This is where frequency where the roll off or slopes starts to begin. As with the picture from above the crossover point is 1 kHz roll off begins at that frequency. [B]2 way crossovers[/B] These crossover have two difference types of crossovers: Low pass filter and high pass filter. [B]3 way crossovers[/B] These crossovers have three different sets of crossovers: Low pass filter, bandpass filter and high pass filter. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Equipment
Speakers
Active vs. Passive: An attempt by me to explain
Top
Menu
Home
Refresh