Building PC Speaker System (2.1) - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 12 (permalink) Old 12-01-2005, 11:15 PM Thread Starter
 
Join Date: Jun 2001
Posts: 3,503
Feedback: 0 / 0%
                     
Building PC Speaker System (2.1)

Ok you audio gurus.

I'm looking at building myself a 2.1 speaker system for my computer. I'm in the research phase of deciding which speakers and such to use. For the main speakers I'm thinking of using either a 3" or a 4" speaker for midrange and a 1" titanium dome tweeter. Needless to say I will need a x-over. Here is an example of what I am looking at (click me). I don't have the frequency point figured out yet. My question is this. If I were to use an 8ohm midrange driver and an 8ohm tweeter, what load is the amp going to see? Will it be a 4ohm load, a 16ohm load, or an 8ohm load? I hope it will be a 4 ohm load. Also, will the power be split evenly between the two speakers? If I push 15W to that channel, will each speaker see 7.5W? I believe they would but my knowledge on x-overs is basic so I figure I would ask.

I'm also looking to use the Sonic Impact T-Amp to drive the main speakers. Will that be enough power to make the main speakers sound good? I plan on using an 8" woofer with 45W for the low end. I don't want the bass to drown out the mids and highs.

I am also thinking about using an extended range 3" or 4" driver for the mids and highs (instead of a seperate midrange driver and tweeter).

My main questions at this point are on the T-amp in regards to the power and what load the amp will see in my above situation.

Thanks for any help.

Take care,
^chase
Warlord187 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 12-01-2005, 11:33 PM
 
Join Date: Mar 2002
Posts: 3,025
Feedback: 0 / 0%
                     
Uhh, so explain to me why you just don't buy a 2.1 set out of the box? There are plenty that I've listened to that sound excellent.

BTW, a long time ago I bought crossovers similar to the ones you linked to from Radio Shack. I'm almost positive that they are nearly identical, and I didn't pay nearly as much for them. I can't say how much they cost now though.
smc1377 is offline  
post #3 of 12 (permalink) Old 12-02-2005, 12:24 AM Thread Starter
 
Join Date: Jun 2001
Posts: 3,503
Feedback: 0 / 0%
                     
Quote:
Originally Posted by smc1377
Uhh, so explain to me why you just don't buy a 2.1 set out of the box? There are plenty that I've listened to that sound excellent.
Mainly for the challenge and for something different. Since I have never done this before it will also make a good starter project. I plan on eventually building a home theatre surround sound system.

The ones that I've listened to (that don't cost an arm and a leg) lack a lot on the low end. A custom built 8" ported enclosure should take care of that.

Quote:
BTW, a long time ago I bought crossovers similar to the ones you linked to from Radio Shack. I'm almost positive that they are nearly identical, and I didn't pay nearly as much for them. I can't say how much they cost now though.
I haven't checked Radio Shack for components, but I certainly do plan to. I got a couple other things I need to get from there anyways.

Last edited by Warlord187; 12-02-2005 at 12:49 AM.
Warlord187 is offline  
Sponsored Links
Advertisement
 
post #4 of 12 (permalink) Old 12-02-2005, 01:05 AM
 
Join Date: Mar 2002
Posts: 3,025
Feedback: 0 / 0%
                     
Should be asleep but this got me thinking. . .

The crossover you linked to was only good for one channel so to get stereo sound, you'd have to buy two of them therefore costing you $40. That got me thinking cause I know there are professional DJ/Club type of equipment that does what you need it to do for a little more dough.

So I searched one of my favorite spots on the net and found this beauty.



The thing is exactly what you need. It has 2-way separation (low and high) for each stereo channel plus it has a subwoofer output. All this in a more attractive looking package and only for $50.

Here's the link to the webpage http://www.musiciansfriend.com/srs7/...se_pid/183703/

Quote:
2-way active low/high output for each stereo channel, plus a subwoofer output.

Crossovers provide precise frequency dividing for multi-amplified speaker applications. This one will give superior performance with transparent audio. Features include a shielded internal power supply with AC voltage select switch (115V/60Hz or 230V/50Hz), phase inversion switches, low-cut subsonic filters for low-frequency driver protection, and servo-balanced XLR inputs.

Nady CX22SW 2-Way Stereo Crossover Features:

* Precise frequency dividing for multi-amplified speaker applications
* Shielded internal power supply with AC voltage select switch (115V/60Hz or 230V/50Hz)
* Phase inversion switches
* Low-cut subsonic filters
* Servo-balanced XLR inputs.

Get it today and take control of the output to your speaker system.
The only downfall I can see with this thing is that in your description, you were looking for a post-amp crossover whereas this is a pre-amp crossover. You'd need a multiple channel amp in order to use this device. Either that or self-amplified speakers and subwoofers.


Speaking of powered subwoofers, this one will wake your neighbors. . . . .that live a block away. This beauty is the same ones you find at the clubs. 1400 Watt peak 18" Sub enclosure.

http://www.musiciansfriend.com/srs7/...se_pid/605262/


Last edited by smc1377; 12-02-2005 at 01:09 AM.
smc1377 is offline  
post #5 of 12 (permalink) Old 12-02-2005, 01:18 AM
 
Join Date: Jul 2005
Posts: 202
Feedback: 0 / 0%
                     
Don't bother looking at radioshack, unless you have a store that stocks a lot of discontinued stuff. They stopped carrying self branded replacement speakers and crosovers about 4 years ago, and the replacement speakers they carried from pioneer were discontinued last year. i've worked for the shack since 2001, btw
Azril
Azril is offline  
post #6 of 12 (permalink) Old 12-02-2005, 01:21 AM Thread Starter
 
Join Date: Jun 2001
Posts: 3,503
Feedback: 0 / 0%
                     
Thanks for the info. I will have to take a closer look at that x-over tomorrow (I need to get to bed ).

The idea is to have as little desk top clutter as possible. That is one of the reasons I was looking at the type of x-over I linked to earlier. One of those x-overs would be mounted inside the speaker cabinet. Since I will have two main speakers, I will need two (as you mentioned). I only listed one in my example since the other would just be a duplicate.

I would use a plate amp for the subwoofer. I would love that Mackie Active, but I live in an apartment and I think the neighbors would complain. Shoot, I am sure they will complain with the modest 45W 8" I plan on building.

The wiring would go like this, assuming I use the T-amp.

From the line out on the PC to the line in on the T-amp. From the speaker outs on the T-amp to the high level speaker inputs on the plate amp. From the high level speaker outs on the plate amp to the main speakers.

I can always build the T-amp into the sub enclosure, or build my own T-amp if I am feeling up to it. I have many ideas running through my head. You have just given me a couple more. Thanks again.

Now, I must go to sleep.
Warlord187 is offline  
post #7 of 12 (permalink) Old 12-02-2005, 01:23 AM
 
Join Date: Jul 2005
Posts: 202
Feedback: 0 / 0%
                     
Quote:
Originally Posted by smc1377
Speaking of powered subwoofers, this one will wake your neighbors. . . . .that live a block away. This beauty is the same ones you find at the clubs. 1400 Watt peak 18" Sub enclosure.

http://www.musiciansfriend.com/srs7/...se_pid/605262/

Ok, i want 2 of those... in my livingroom
Azril is offline  
post #8 of 12 (permalink) Old 12-03-2005, 01:44 AM
 
Join Date: Mar 2002
Posts: 3,025
Feedback: 0 / 0%
                     
Quote:
Originally Posted by Azril
Don't bother looking at radioshack, unless you have a store that stocks a lot of discontinued stuff. They stopped carrying self branded replacement speakers and crosovers about 4 years ago, and the replacement speakers they carried from pioneer were discontinued last year. i've worked for the shack since 2001, btw
Azril
That sucks that they don't carry that stuff anymore. That was the only reason Radio Shack was any good. Heck, at my local Radio Shack they don't even carry the cheapie A/V cables anymore, just the more expensive stuff. That was the only other reason they were a good place to shop.
smc1377 is offline  
post #9 of 12 (permalink) Old 12-03-2005, 03:09 PM
 
Join Date: Jan 2003
Posts: 113
Feedback: 0 / 0%
                     
Check out www.partsexpress.com for speaker components and anything else you might need. I havn't bought anything off them yet but a friend has referred me to them and they got just about everything and anything that deals with car/home audio.
gyjfb65 is offline  
post #10 of 12 (permalink) Old 12-03-2005, 08:31 PM Thread Starter
 
Join Date: Jun 2001
Posts: 3,503
Feedback: 0 / 0%
                     
I really need to know what impedance the amp will see if I use an 8ohm tweeter and an 8ohm midrange driver with that kind of x-over I linked to above. I need that info to determine what speakers and what amp to get. That is the current hurdle I need to jump over.
Warlord187 is offline  
post #11 of 12 (permalink) Old 12-05-2005, 03:10 PM
Intrepid Pro
 
Join Date: Aug 2005
Location: Arlington Texas
Posts: 2,823
Feedback: 1 / 100%
                     
Go to www.apexjr.com and check out their surplus amps. Last time I checked they had a 25x2 full range plate amp.

Or better yet, build your own using one of the nice ICs from ST Microelectronics or National Semiconductor. www.qkits.com has some nice amp kits. One of their 50w units has an ST IC on it, you need 2 as they are mono.


Elliott Sound Products has some NICE pre designed printed circuit boards for use witht the National ICs, they come with a manual and compnent list. Get the components at www.digikey.com The circuit boards are light, so shipping from Austrailia shouldn't be TOO bad.

If building an amp isn't your cup of tea, go on ebay and get one of those mini receivers. I got a Onkyo MC35Tech for 200 bucks, it came with a 3disc changer too. It has a subwoofer ouput for use with a powered sub. Look for Onkyo, Denon and Yamaha micro systems. The Teac Reference series mini components are great too. These are often sold with just the amp or receiver part and no speakers, The sound quality is good from these little units. Some of the OLDER Sony micro stuff is good.

See the MC35 here: http://www.us.onkyo.com/model.cfm?m=...s=Audiosys&p=i

Keep in mind that I'm not talking about those cheap glorified boomboxes you see all the time in wal mart with the flashing lights and huge power claims, the componets I'm talking about are simply smaller counterparts of REAL stereo components. They are modest in appearance and don't look like they've been "riced out".

Any way you slice it, you need at least 15w of CLEAN power, that class T thing you were looking at is not going to cut it.

As for the speakers, I like the Audax Aerogel 4 inch, but I prefer larger midbass drivers. The tweeter that I like is the Dayton silk dome. You will likely need to build your own crossover for the best sound. The frequency response charts are your friends, use them.

Use good parts in your crossover. Use poly or mylar caps in the crossover instead of non polar electrolytics, the result is smoother sound. Resistors should be 1% tolerance and non inductive, this helps you design a more accurate crossover. Inductors should be 16 gauge or thicker to prevent power loss. All components should be 5% tolerance or less. A good crossover can make OK speakers sound great, a bad one can make a pair of expensive Scan Speak drivers sound like crap. With that said, most premade crossovers SUCK.

To avoid crossing over too high in the midbass, you might consider a 5.25 inch midbass driver instead of a 4 inch, this will put male vocals and lower frequencies of smaller string instruments where they belong, not in the sub! There is also a better selection of drivers in the 5.25 size range.

I like crossover frequencies less than 100HZ, any more and the bass becomes obvious that it's coming from the sub and the soundstage goes to hell.

As for the woofer, I like the 8 inch shielded DVC that parts express has. It's cheap and it sounds good. Get the parts express 70w sub amp, it's good. Use a ported box, it's output is a bit low in a sealed box.

The enclosures for all the speakers should be made of at least 1/2 inch MDF or birch plywood. 5/8 inch is preferred for most boxes, BIG subs need 3/4 inch wood.

Line the box with polyester if you are doing sealed boxes or just line the back of the box for ported boxes.
hardwareguy is offline  
post #12 of 12 (permalink) Old 12-05-2005, 06:46 PM Thread Starter
 
Join Date: Jun 2001
Posts: 3,503
Feedback: 0 / 0%
                     
Thanks hardwareguy. I'll take a look at those links.

Isn't 5.25" a bit big for a 2.1 computer speaker system? Maybe not.
Warlord187 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionaly, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
check engine light digerati General Discussion (Second Generation) 32 04-24-2011 04:38 AM
I need help with the stock system in a 95 intrepid mitchbabin Car Audio and Video 5 09-22-2005 03:00 PM
the "OEM" amp DKILLA Car Audio and Video 17 09-14-2005 07:44 PM
98 2.7 ac system and other parts khelfrich Buy / Sell / Trade 0 04-20-2005 10:48 AM
Creepy building... at my job... DallasMagnum Whatever 13 10-17-2003 06:07 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome