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Old 20th September 2010, 10:12 AM   #1
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Default Computer speakers

hi guys,

this is my first post here and I am kind of a newbie. I have built a css sdx-15 based ported sub, but this is my first attempt to build speakers. I know how to use winisd etc, have some knowledge about electronics, have help for woodwork and soldering

I want to build floorstanders eventually for my main system and taking this computer speakers project as a prototype.

Basic Info:
Source - M-Audio revolution 7.1 sound card. Might replace with a good 2 channel card if speakers turn out to be very good, or might go with a separate DAC.

Amp - Undecided yet, most likely will be a 30-50w SS integrated/power amp, preferably used. Will buy after the speakers are fully done and I have listened to these with a few amps.

Room Size is about 10x14 feet.

Music - blues, classic rock, heavy metal, jazz, western classical, indian classical etc in that order of preference.

Max Speaker size - limited by my computer desk, max size of the spkrs will be wxhxd - 9x10.5x9". gives a max internal volume of about 10L including port, driver, bracing etc, assuming 0.5" wood.

Budget: I wouldnt want to spend more than 100-120$ on the parts. Cabinets are extra.

Options:
1. How would a 3-5" FR driver do in such a setup. I dont have a sub for this system as of now and if needed I can build one later for this.

2. Use a small 2" FR/WR driver and add a small 4-5" woofer.

3. Use a 4-5" FR and a 1" tweeter.

4. Use a regular 2 way.


Which ones of these are good options for my setup. Please recommend some drivers/kits etc. Please also explain your reasoning if you can as I need to learn from these to be able to make full speakers after a few months.

Thanx
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Old 20th September 2010, 03:53 PM   #2
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a sub + sealed satellites with any of the small markaudio from chr to alpair 7 would be a very good setup.

consider:
.being nearfiled pc speakers you can go sealed and have good results in the LF with some equalization, search the forum for markaudio with dsp setups

.then once you have the sub you can leave them as satellites and have a very good setup also for farfield listening

.i'm considering doing the same with a pair of alpair6 i own and four ikea bowls, also you can search for it on the forum

.notice the new alpair6 will be out soon.

.then if you'll want mains floorstander you can set them on stand cabinets with woofers in a FAST fashion

i don't really see a reason not to go sealed when you are talking nearfield or a sub/helper woofer is a viable option. specially when one accepts to trade some purity for heavy metal


also your 7.1 card can give you 'easy' digital crossover functionality with the right software and make possible an OB with the same drivers (and that's where i'm not decided to go sealed or find a pair of woofers to make OB minimonitors with the alpair6 like gainphile a member here did with tangbands in the multyway forum, making them ready to be on top of OB subs also, time and money will choose for me)

if you want to experiment cabinet design than i think that MJK tools would be more useful than winisd to get the juice out of a single fullrange driver, have a look:
Quarter Wavelength Loudspeaker Design
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Old 20th September 2010, 04:35 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

There are loads of posts on computer speakers not suprisingly,looking
at those wil giove you loads of options, but note this case is very
diiferent to larger flloestanding farfield hi-fi speakers.

A selection of the best links to learn / for reference :

rgds, sreten.

Paul Carmody's DIY Audio Projects - undefinition
Zaph|Audio
FRD Consortium tools guide
RJB Audio Projects
Speaker Design Works
HTGuide Forum - A Guide to HTguide.com Completed Speaker Designs.
Humble Homemade Hifi
Click below to go to
Quarter Wavelength Loudspeaker Design
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
Linkwitz Lab - Loudspeaker Design
Music and Design
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Old 20th September 2010, 07:57 PM   #4
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Maybe something with the CSS EL70?
I really like that driver in my Mar-Kel70 cabinets and they aren't even finished yet!
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Old 20th September 2010, 09:10 PM   #5
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There are a large number of good FRs that are perfect for this application.

The Gen 2 Mark Audio (which started with the CSS EL70) are very good and don't really need tweeters. Boxes that fit your criteria exist already for EL70, CHR-70, Alpair7. The new Alpair6s hold lots of promise -- the metal cone one should work in a box as small as 1.5 litre.

dave
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Old 20th September 2010, 09:13 PM   #6
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Yeah, there's no real need for a tweeter if you go with EL70. Good highs.
Still lacking some bass i think. Dave, can you tell me how much i should stuff them?
That's the thing that keeps me from finishing them :S
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Old 20th September 2010, 09:17 PM   #7
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Find some 1/2" wool or cotton felt (carpet underlayment for home or car is probably your best source). Line all the walls (don't impede the entrance to the port slots). Rock wool is not a good choice.

dave
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Old 20th September 2010, 09:19 PM   #8
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Well. I think i got some of this... Foam?
Is that something i can use? I also got some... I can get pictures tomorrow. I lack the words for those uncommon things in life.
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Old 20th September 2010, 09:40 PM   #9
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Foam doesn't work so well.

If you get really strapped i can send you some of the 1/2" cotton felt we use for a token + postage.

dave
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Old 21st September 2010, 07:19 AM   #10
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Thanks, but i will try and get some pictures of what i mean.
What do you think it would cost to send that things?
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