Help needed for a DIY speaker project.

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Hi to everyone who reads this.

I live in South Africa English is my second language so there will be spelling mistakes here.

I have recently bought myself a Sony V 555 ES receiver 5.1 channel 120 watt per channel. I want to build myself cinema surround speakers because ofter serving the net I am now confident that it is possible to build good quality speakers.
I thaught that I would try the Geers eVe II. It seemed to me that the guys know what they were doing so the plan whas to buy the drivers and start a.s.a.p

Unfortunately for me I can't find any scan-speak drivers in S.A so if I want to continue I must import drivers. After I have heard the price of these drivers it was clear to me that it would be expensive secondly I know what a cross over is supposed to do but I can not put one together from a scets nor do I know what the symbols stand for so you can see I am a total beginner.

I can find Seas and Excel drivers in S.A but I don't know which one to use,what cross over and box sices.

If anyone out there can give me any advise on building my own 5.1 speakers that would sound really great on my Sony then I would really appreciate it.

Thanks for reading this far I have tried to correct the spelling mistakes.
First of all - I'd recommend getting one or two books on the subject.

Yes there is a lot of information on the 'Net - however - much of it (including discussion forums like these) assume some basic knowledge first. Discussion forums are good for refining your knowledge - or clarifying something you have read. Learning about speaker design is something more than a few discussion forum posts can answer.

Try Vance Dickason's book - "The Loudspeaker design cookbook" - although I haven't read it - from what people say it seems to be the reference / bible of speaker building.

Otherwise (and I have read these) - try Ray Alden - "Advanced speaker design" and also David Weems - "Designing , building, testing your own speaker system - with projects"

Both books cover closed vs. vented enclosures, crossovers (what are they, how to select L (inductors), C (capacitors), and R (resistors) appropriate for the order and frequency of your crossover, impedance compensation, resonance filters, notch filters and tweeter attenuation (L-Pads).

the main thing is to have some clear design goals in mind - remember speakers are all about compromises (size vs efficiency vs response bandwidth) - so decide first which elements are most important - and also whether you want this system for mainly home theatre or music

Books, software...

I recommend buying a book, they will explain what those zig-zag things are (resistors) etc.. After joinning this site I have thought about building my own speakers however, I WILL need a book. I know what those symbols are but, what do they do?? I checked this book at a bookstore, it explained everything. I'm buying in 30 minutes from now, well, g2g. This is so cool!!!! I'm building my own speakers!!:) I'm putting so much research into my system...and...I also have to study for exams, so that I can become an engineer. Bye man, good thing to hear you join.
(as stated before English is my second language.)

Thanks to everyone that replied. Like most of us I believe you alsow have a tight schedule during the day.I appreciate it that you took time of and answerd my questions.

It is now obvious to me that I must get my "foundation's" corect before I can continue to buld speakers. I am better off knowing exactly how they work and what would happen if I chain's something along the way.

If possible can you tell me what you think is better a closed box / vented box or a Transmission Line Speaker and perhaps state why.(Keeping in mind that it would be for a 5.1 home theater sestem.)

Thanks again to everyone that have read this far.
speaker enclosure

I'd use a vented enclosure for the subwoofer and a sealed or closed enclosure for the speakers. My theory: Using two smaller drivers using the inside of the enclosure for reflections gives you the power to crank the sub's volume. The air escaping the subwoofer will evacuate the air through the vent allowing the air to travel on a 'bed' of air.
Theory for the five speakers: Placing drivers in a sealed enclosure will allow you to use absorbing materials which will decrease the sound that would be diffracted (reflected) back out into the room. If the diffraction is allowed to occur sound from the back of the driver will reach the ears later. Although, only a split second later, the less distortion allowed to occur the better your system sounds when showing it off to your friends:D . I don't have a theory on transmission line speakers for, I don't know what they are. I'm still learning the ropes...Anyway I hope this info will help you and not point you towards these designs only.
Bose(o) is talking about a Bandpass subwoofer. The idea of launching sound on air from a port is not new. Only the idea of the 6th and 8th order bandpass subs are Bose ideas. The early Acoustimass 3 speakers used a 6th-order bandpass subwoofer.

You might consider, if price is a big thing for you, that you should go with the Parts Express generic 6.5" DVC woofer driver. It only extends to 45 Hz, but it's pretty good for its size, in a 4th-order Bandpass. And it will eliminate the need for a separate amplifier.

4th and 6th-order bandpass subwoofers can be modeled using WinISD, which is available for free at

Then use a pair of the 4" generic woofers and the titanium dome tweeters for the satellites. The woofer is shielded, but the tweeter is not. If you need a shielded dome for A/V use, try the Audax domes.

The aforementioned 3-piece system is hardly high-end, but it probably will provide decent sound for its size.
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