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Beckerson1 08-22-2012 12:08 PM

Computer speaker build (quality, yet cheap)
 
Here is what I have:

Amazon.com: Eagle Tech ET-AR504LR-BK 2.1 Soundstage Speakers with Subwoofer & Remote: Electronics

Subs response is crappy on the lower end. So I'm thinking of taking on a low end, quality budget build. The idea is to use at least the towers which have:

Total RMS Power: 35 Watts
-Satellites: 10 Watts RMS x 2 (into 4 ohms, @<=1% THD)
-Subwoofer: 15 Watts RMS x 2 (into 4 ohms, @<=1% THD)
Total Peak Power: 70 Watts
Frequency Response: 20Hz to 20kHz
Drivers:
-Satellites: Dual 3-inch midrange and 1-inch tweeter with solid wood enclosure
-Subwoofer: 5.25-inch driver with solid wood enclosure
Speaker Dimension:
-Satellites: 4.33" x 9.65" x 4.77"
-Subwoofer: 6.7" x 11.03" x 10.25"


I'm looking more at correcting the low end over the high end as the satellites do sound really good, keeping in mind these are computer speakers... The towers are RCA type connections and I'm not looking to keep the stock amplifier as I'm pretty sure its about to crap out...


I'm trying to keep this a low end budget so I would say no more then $100-$150... Looking at building a new enclosure for the sub and amp... Nothing more then an 8"... Would like it to play decently low 25-30 hz

Maybe doing a t-line for a 6.5" if I could find one to play decently low without much problem...

Any suggestions?

49konvict 08-22-2012 12:11 PM

Re: Computer speaker build (quality, yet cheap)
 
(-NEW-) American Bass XD-65 6.5" 300W 4-Ohm Sub 6-1/2 XD.654 XD-6 XD6 XD65 XD654 | eBay

just bought one

can you say beast?

im doing a tline tunned around 33 hz and its 3 cubes

Beckerson1 08-22-2012 12:18 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by 49konvict (Post 916304)
(-NEW-) American Bass XD-65 6.5" 300W 4-Ohm Sub 6-1/2 XD.654 XD-6 XD6 XD65 XD654 | eBay

just bought one

can you say beast?

im doing a tline tunned around 33 hz and its 3 cubes

I was actually just looking at your thread

49konvict 08-22-2012 12:21 PM

Re: Computer speaker build (quality, yet cheap)
 
it should be here in the next few days but it will be a few weeks untill the box is built. im still trying to fiqure out the nightmare that is hornresp

Fallen 08-22-2012 12:28 PM

Re: Computer speaker build (quality, yet cheap)
 
I'll recommend the MCM high excursion 8. It's pretty decent for the price ($35)
It works well vented.

http://www.mcmelectronics.com/product/55-2421



And a plate amp too. That's within budget :)
http://www.mcmelectronics.com/produc...-6272-/50-6272

All you need to add is an appropriate port and box :)




Beckerson1 08-22-2012 12:29 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by 49konvict (Post 916307)
it should be here in the next few days but it will be a few weeks untill the box is built. im still trying to fiqure out the nightmare that is hornresp

LOL... let me know how they turn out... I can fit 8" in my doors of my Civic with some sheet metal work but if I can get a 6.5" that will sound good, and get LOUD at a 80hz crossover point.... I will look into them... Don't really want to hack up the doors at this time... This would be done about the same time I'd go active

Beckerson1 08-22-2012 12:35 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by Fallen (Post 916311)
I'll recommend the MCM high excursion 8. It's pretty decent for the price ($35)
It works well vented.

MCM Audio Select 8'' High Excursion Woofer - 120W RMS 4ohm | 55-2421 (552421) | MCM Audio Select



And a plate amp too. That's within budget :)
MCM Audio Select 100 Watt Subwoofer Amplifier Module | 50-6272 (506272) | MCM Audio Select

All you need to add is an appropriate port and box :)

Tempting for the price... Ever heard it?


Unfortunately I would need something to power my towers to

Fallen 08-22-2012 01:02 PM

Re: Computer speaker build (quality, yet cheap)
 
I've owned a total of 6 of those 8s. I'm currently using a pair in my GFs car. 2 I sold and the other 2 are in storage. I haven't had an issue with any of them. (buy 4 and the price drops 10% lol)

Now the amp I haven't used, but it seems pretty decent :)

EDIT:

Wait, just use the amp in the towers for now. I doubt it'll be a weak point, in my experience the crappy speakers blow way before the amp dies. (well not saying your speakers are crappy so much as the amps are usually decent.)

Finding a 2.1 ch plate amp is possible, but under $150 will be tough. (impossible) And keep in mind whatever you do find needs a crossover for the sub. So using an old receiver is not an option without a crossover. Active crossovers are expensive.

If I was you I'd stick to the plate amp + sub and use the old speaker towers and their amp for now. When(if) it does die find used good 2 ch receiver to power the towers.

RE EDIT:

Ok I'll try again:

http://www.parts-express.com/pe/show...number=300-771

http://www.parts-express.com/pe/show...number=295-200

Haven't used this sub or the amp however.




Beckerson1 08-22-2012 01:16 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by Fallen (Post 916315)
I've owned a total of 6 of those 8s. I'm currently using a pair in my GFs car. 2 I sold and the other 2 are in storage. I haven't had an issue with any of them. (buy 4 and the price drops 10% lol)

Now the amp I haven't used, but it seems pretty decent :)

EDIT:

Wait, just use the amp in the towers for now. I doubt it'll be a weak point, in my experience the crappy speakers blow way before the amp dies. (well not saying your speakers are crappy so much as the amps are usually decent.)

Finding a 2.1 ch plate amp is possible, but under $150 will be tough. (impossible) And keep in mind whatever you do find needs a crossover for the sub. So using an old receiver is not an option without a crossover. Active crossovers are expensive.

If I was you I'd stick to the plate amp + sub and use the old speaker towers and their amp for now. When(if) it does die find used good 2 ch receiver to power the towers.

RE EDIT:

Ok I'll try again:

Dayton Audio MCA2250E 2.1 Channel Class D Amplifier 300-771

Dayton Audio DCS205-4 8" Classic Subwoofer 4 Ohm 295-200

Haven't used this sub or the amp however.

So how would I wire this new sub amp to the existing sub channel from the plate amp on the old unit... believe it to be a 2.1 plate amp... Or would you use a RCA split, basically have two right inputs, and two left inputs and then basically cut the old subs power inputs?

Fallen 08-22-2012 01:50 PM

Re: Computer speaker build (quality, yet cheap)
 
The xover for the sub in the existing unit is probably garbage. It likely crosses the sub over at 150Hz or higher. and who knows if it has a high pass to protect the old sub, which might be right in your passband now.

But the towers are probably also highpassed so that opens up an intersting problem.

I think the easiest way would be to go with the 2.1 plate I found and an 8" sub and completely replace the stock amp. Which is I know, the opposite of what I was saying before.

But I hadn't thought about the issue of there potentially being a HPF at say 40Hz to protect the old 5.25" sub.

The best thing to do is measure the frequency response of the subwoofer output and post it up. Then we can move forward.

If you post the voltages from 20-160Hz in say 5Hz steps we can figure out the response. don't do it full tilt, but close to it (don't clip the amp). I want to see if there's any bass boost etc going on.

If you don't want to go through that effort, go for the 2.1 ch amp. :)




Beckerson1 08-22-2012 02:20 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by Fallen (Post 916322)
The xover for the sub in the existing unit is probably garbage. It likely crosses the sub over at 150Hz or higher. and who knows if it has a high pass to protect the old sub, which might be right in your passband now.

But the towers are probably also highpassed so that opens up an intersting problem.

I think the easiest way would be to go with the 2.1 plate I found and an 8" sub and completely replace the stock amp. Which is I know, the opposite of what I was saying before.

But I hadn't thought about the issue of there potentially being a HPF at say 40Hz to protect the old 5.25" sub.

The best thing to do is measure the frequency response of the subwoofer output and post it up. Then we can move forward.

If you post the voltages from 20-160Hz in say 5Hz steps we can figure out the response. don't do it full tilt, but close to it (don't clip the amp). I want to see if there's any bass boost etc going on.

If you don't want to go through that effort, go for the 2.1 ch amp. :)

I will probably go with the 2.1 plate amp and 8" sub route anyway (I am planning so it won't be until a few months, little winter project) since I was planning something like that anyway... but am willing to tare this things apart to see what they have going on... At this time my DMM is toast so i will have to wait till I can borrow or have my friend loan me his... Dumb leads fell apart

Plus its at his house...

Burkem_10 08-22-2012 03:17 PM

Re: Computer speaker build (quality, yet cheap)
 
I have the logitech z2300 2.1 set that sends 40w rms to the satellites and 120w rms to the 8" subwoofer. I replaced the satellites with 2 dayton audio 6.5" bookshelf speakers that ran me like $30 and the sound quality/midbass improved a lot. Unfortunately the subwoofer is still stock and that's what I'll be changing next. I'd really recommend getting some different full range speakers. The z2300 satellites are like 3" full range drivers and have horrible midbass. These daytons get so loud off of 40w rms that I never have the volume above 50% any more; 15-35% is normal now. '

I'm tuned in to see how this goes because I want to do something similar :P

Beckerson1 08-22-2012 04:06 PM

Re: Computer speaker build (quality, yet cheap)
 
Quote:

Originally Posted by Burkem_10 (Post 916337)
I have the logitech z2300 2.1 set that sends 40w rms to the satellites and 120w rms to the 8" subwoofer. I replaced the satellites with 2 dayton audio 6.5" bookshelf speakers that ran me like $30 and the sound quality/midbass improved a lot. Unfortunately the subwoofer is still stock and that's what I'll be changing next. I'd really recommend getting some different full range speakers. The z2300 satellites are like 3" full range drivers and have horrible midbass. These daytons get so loud off of 40w rms that I never have the volume above 50% any more; 15-35% is normal now. '

I'm tuned in to see how this goes because I want to do something similar :P

lol it will be a little bit but hope to get it done by years end... I want to keep the speakers as small as possible as it will be mobile... and the stock speakers themselves sound really good... I'm really impressed with the response... I ran a sweep and God they can scream... ear piercing at points and that's at low volume.... Week points at the sub... But there probably would be a gap as these seem to be crossed at 200 hz or so...


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