I've created a website that explains loudspeaker theory with simplified language and illustrations. The address is:
www.cyberus.ca/~ec091357/HomePage.shtml
www.cyberus.ca/~ec091357/HomePage.shtml
I am most definitely a novice. I have read many articles on crossover networks, and am uterly confused.
When I look at these diagrams (such as the one at the end of the link above), I don't understand the "bridging" used between the positive and negative leads. I looks to me like the signal would pass straight through, and the "bridge" with the inductor and capacitor would have no effect.
Maybe someone can let me know what I am missing.
Sorry if I am using the wrong terminology.
When I look at these diagrams (such as the one at the end of the link above), I don't understand the "bridging" used between the positive and negative leads. I looks to me like the signal would pass straight through, and the "bridge" with the inductor and capacitor would have no effect.
Maybe someone can let me know what I am missing.
Sorry if I am using the wrong terminology.
great job !
Very nice site with good basic stuff.
If your open to suggestions I think with such good quality
diagrams using a typical rather than simplified magnet structure
with the magnet ring and pole pieces would aid understanding.
🙂 /sreten.
Very nice site with good basic stuff.
If your open to suggestions I think with such good quality
diagrams using a typical rather than simplified magnet structure
with the magnet ring and pole pieces would aid understanding.
🙂 /sreten.
SB :
The diagram may be confusing you with its central earth,
the wiring is in paralell, not bridged, top and bottom are
poth positive.
🙂 /sreten.
The diagram may be confusing you with its central earth,
the wiring is in paralell, not bridged, top and bottom are
poth positive.
🙂 /sreten.
Website schematic diagram
Hello SB
Thank-you for your reply. The diagram may be confusing as the woofer and tweeter are electrically connected to the amplifier in opposition. The positive terminal on the woofer is connected to the negative (or earth) terminal of the amplifier, and the positive terminal of the tweeter is connected to the positive terminal of the amplifier.
This wiring corrects for the phase problems between the woofer and tweeter that occur around the crossover frequency. A noticable dropout will be present in the upper midrange if the tweeter and woofer are not connected in this way.
Hope this helps.
Stephen
Hello SB
Thank-you for your reply. The diagram may be confusing as the woofer and tweeter are electrically connected to the amplifier in opposition. The positive terminal on the woofer is connected to the negative (or earth) terminal of the amplifier, and the positive terminal of the tweeter is connected to the positive terminal of the amplifier.
This wiring corrects for the phase problems between the woofer and tweeter that occur around the crossover frequency. A noticable dropout will be present in the upper midrange if the tweeter and woofer are not connected in this way.
Hope this helps.
Stephen
website diagram
Thank-you for your reply, "sreten". With regards to the oversimplified magnet structure, I wrote a disclaiming note in the introduction, instead of making the extra effort with the diagram. Sheer laziness.
Stephen
Thank-you for your reply, "sreten". With regards to the oversimplified magnet structure, I wrote a disclaiming note in the introduction, instead of making the extra effort with the diagram. Sheer laziness.
Stephen
Thank you for your help. I have a mental block somewhere that won't let me see what the wiring should look like in real life. I will keep reading!
Well its up to you, but I beleive a disclaimer on a 'primer' site
is defeating the point somewhat. Any one finding your site
useful will simply not understand the disclaimer.
I do, but that's because I don't need your site. A hard way
of putting it is that your magnets are simply wrong, and the
term "air gap" in your glossary is not adequately illustrated.
/sreten.
is defeating the point somewhat. Any one finding your site
useful will simply not understand the disclaimer.
I do, but that's because I don't need your site. A hard way
of putting it is that your magnets are simply wrong, and the
term "air gap" in your glossary is not adequately illustrated.
/sreten.
Great site Stephen,
I hadn't run across any other sites that offered as clear of explanations and it cleared up a few questions I had always had. Still have one more though, is it true that a port length of 8" inches is always used for typical loudspeakers? I thought it was more complicated than that. Also, in your glossary of terms you might want to add that "spider" and "surround" are synomonous with centering device and suspension. Thanks for contributing to the hobby,
George
I hadn't run across any other sites that offered as clear of explanations and it cleared up a few questions I had always had. Still have one more though, is it true that a port length of 8" inches is always used for typical loudspeakers? I thought it was more complicated than that. Also, in your glossary of terms you might want to add that "spider" and "surround" are synomonous with centering device and suspension. Thanks for contributing to the hobby,
George
It IS more complicated than that. Box size and port size are generally calculated using a number of driver characteristics. These are called the Thiele/Small characteristics. The calculations are quite complex but there are some free software programs that can help with this. Perhaps, Stephen, you could link to some of these program downloads rather than have the simplified diameter/box size graph that you use now.Wright said:
I also think that the enclosure page doesn't do full justice to sealed-box designs as it currently reads. There are a number of advantages over ported designs. Speaker design is always a question of choosing one's compromises. You gain some, you lose some.
Nevertheless, I'll say again that I think that this is a very good primer with an excellent prose and design style. I hope that it develops into a top loudspeaker design resource.
George, it's not true that "spider" and "surround" are synomonous with centering device and suspension. High quality drivers often use the surround solely as a means of preventing the front and back waves interfering with each-other. The job of centering and suspension is often performed solely by the spider (or equivalent mechanism).
Steve,
Thanks for the clarification, I guess that's why we need good beginner's site's like this.😀
Thanks for the clarification, I guess that's why we need good beginner's site's like this.😀
replies
Hello Everyone
Back online after a week in bed with the flu.
Thank-you for your comments and suggestions. Yes, the site tends to oversimplify a complex subject.
Ten lashes with the proverbial wet noodle for me. I'll add a diagram and explanation of the magnet structure for clarification.
Tim, feel free to include my site in your list of links; nice complement.
The explanation about port design is based upon experience with average woofers. Finding the best match between enclosure volume, port dimensions and woofer characteristics may be a bit daunting for the first-time buider. The dimensions in the site are conservative and provide fairly predictable results.
Actually, the best-sounding loudspeaker I've heard was a sealed design. However, the novice may lack the experience to choose a woofer that yields the best bass extension in a sealed enclosure.
Hello Everyone
Back online after a week in bed with the flu.
Thank-you for your comments and suggestions. Yes, the site tends to oversimplify a complex subject.
Ten lashes with the proverbial wet noodle for me. I'll add a diagram and explanation of the magnet structure for clarification.
Tim, feel free to include my site in your list of links; nice complement.
The explanation about port design is based upon experience with average woofers. Finding the best match between enclosure volume, port dimensions and woofer characteristics may be a bit daunting for the first-time buider. The dimensions in the site are conservative and provide fairly predictable results.
Actually, the best-sounding loudspeaker I've heard was a sealed design. However, the novice may lack the experience to choose a woofer that yields the best bass extension in a sealed enclosure.
Stephen,
It is a great start...
1st you should add navigation to all the pages....
also, not all enclosures are bass reflex and not all tweeters are domes.
dave
It is a great start...
1st you should add navigation to all the pages....
also, not all enclosures are bass reflex and not all tweeters are domes.
dave
reply
Hello Dave
Yes, not all speakers are bass-reflex and not all tweeters are domes.
Again, the website audience are novice builders, and the site presents the most common components and box design. Hard to imagine its size if I explored transmission line theory, horn loading, ribbon tweeters, etc.
For theses reasons, I kept the size of the site to only six pages and did not include navigation. However, I'll add a note to the effect of your comment during the next update. Thank-you for your input.
Stephen
Hello Dave
Yes, not all speakers are bass-reflex and not all tweeters are domes.
Again, the website audience are novice builders, and the site presents the most common components and box design. Hard to imagine its size if I explored transmission line theory, horn loading, ribbon tweeters, etc.
For theses reasons, I kept the size of the site to only six pages and did not include navigation. However, I'll add a note to the effect of your comment during the next update. Thank-you for your input.
Stephen
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