1. Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

# Custom Hi-Fi Systems/Car Subwoofers for PC Speakers

Discussion in 'General Hardware' started by WOG-BOY, Apr 7, 2010.

1. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Amps Watts Volts Conversion Guide

Converting Watts to Amps

The conversion of Watts to Amps is governed by the equation Amps = Watts/Volts

For example 12 watts/12 volts = 1 amp
Converting Amps to Watts

The conversion of Amps to Watts is governed by the equation Watts = Amps x Volts

For example 1 amp * 110 volts = 110 watts

Converting Watts to Volts

The conversion of Watts to Volts is governed by the equation Volts = Watts/Amps

For example 100 watts/10 amps = 10 volts

Converting Volts to Watts

The conversion of Volts to Watts is governed by the equation Watts = Amps x Volts

For example 1.5 amps * 12 volts = 18 watts
Converting Volts to Amps at fixed wattage

The conversion of Volts to Amps is governed by the equations Amps = Watts/Volts

For example 120 watts/110 volts = 1.09 amps

Converting Amps to Volts at fixed wattage

The conversion of Amps to Volts is governed by the equation Volts = Watts/Amps

For Example, 48 watts / 12 Amps = 4 Volts

Explanation

Amps are how many electrons flow past a certain point per second. Volts is a measure of how much force that each electron is under. Think of water in a hose. A gallon a minute (think amps) just dribbles out if it is under low pressure (think low voltage). But if you restrict the end of the hose, letting the pressure build up, the water can have more power (like watts), even though it is still only one gallon a minute. In fact the power can grow enormous as the pressure builds, to the point that a water knife can cut a sheet of glass. In the same manner as the voltage is increased a small amount of current can turn into a lot of watts.

2. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
wow man u know way too much lol jks
im guessing u really love quality of sound?
im more for spl but still minimum distortion as possible

i was waiting for some1 to bump this thread dont know if ur alowed to double post or not

p.s. thanks for the coversions

3. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Solid-state VS Valve Amplification

The main advantage of a solid-state amplifier is that it uses "negative feedback" a feedback that literally fed back into the circuit - to stabilise the signal and improve gain (or volume). While this gives you plenty of power to drive massive speakers and hurt your neighbours, it does affect the characteristics of the audio signal.

Valve amps, on the other hand, use very little negative feedback and have very linear circuits. If your aim in amplifying an audio signal is to alter it as little as possible from the original , then a linear circuit has a good chance of doing that.

Something that baffles many valve n00bs is the apparent "weakness" of valve amps, in terms of power. An example of one called the PrimaLuna ProLogue FouR has only 35W per channel! What a piece of junk! But no: because valve amps are linear, their wattage "counts" for a lot more. About eight times more. So the ProLogue FouR can pump it with a 280W solid-state amp.

What is then true is that, dollar for dollar, it is much cheaper to get "valve sound" using a valve amp than it is to buy a very high-end solid-state system.

4. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
When you get lots of quality a usual bi-product, to me at least seems to be a lot of volume as well

5. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
im proberbly 1 of thoes noobs too.... dont know as much as most of these people here and there is a big difference with the amount of experience they have had to me...
im just guessing but i think my NAD amp comes into that value area, some1 said its 45W each channel yet can destroy my 3 way pioneer 90W speakers easy at low volume.

haha yea proberbly but im thinking most of the high-end amps can only do that my Yamaha amp hasnt got as much quality as the NAD but the yamaha is newer.... cheap china products im guessing is the cause.

p.s. what do you think about kicker subs compared to rockford fosgate? eg build quality and correct rms

6. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Is your NAD a valve amp? otherwise, it's just the old factor of newer stuff is cheaper made having more short cuts made in manufacturing for cost cutting like *cough* Sony in their original PlayStations for example. I know someone who did mod chips on them and he said each revision they cut more and more cost out of it, and then on the Slimline one's they couldn't even run San Andreas without burning out the laser cos of the amount of data it had to keep constantly reading off the discs. Compared with the old days where products where made so company could make a name for themselves in supplying a decent product that would last for years to come, where as these days it's not about something being reliable unless you pay real top dollar, it's more about who can get their stuff out first with new technologies integrated and such, and rake as much money from it as possible. Well that's my opinion anyways.

7. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
and a good opinion
i dont know if it is or not. i got it from my uncle not long ago, he has no information about it
and forogt the cost -_- ohwell it performes above my likings so i have nothing to complain about

8. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Yeah, sounds good, always liked the sound of the old NAD's and Rotels

WOG-BOY says thanks.
9. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
just wondering, can you wire a car subwoofer to a car amp using both front and rear channels bridged to gain the most power insted of using just 1 channel? im guessing it wont work but would be nice to know

10. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Yes you can, just make sure you read the amplifier's manual regarding bridging on your particular model. Also read this handy guide --> http://www.bcae1.com/bridging.htm

11. ### rizla1

Joined:
Oct 23, 2008
Messages:
485 (0.19/day)
9
Location:
ireland
thats kinda what i randoly figured out with my dell sub. had to rewire it [rabits]
it was putting out no bass at all. also i have my stock pc speakers in ear output , amp in front , 1 day when i was tidying up the cables i ran a wire from back speakers to the amp . and then i had bass? it should have been working on its own but maybe it needed better signal /power? . i dont no that much about speakers/amps n sitch.

12. ### ste2425

Joined:
May 27, 2008
Messages:
3,510 (1.32/day)
422
Location:
Huddersfield, uk
i think someone on here told me that if its line level (going into the amp) you cannot just put two channels together by splicing the wires together it makes the voltages too high or something. If it was speaker level (going out of the amp to speakers) thats fine.

13. ### caleb

Joined:
Sep 15, 2004
Messages:
1,557 (0.39/day)
207
Location:
You cant join 2 diffrent line signals like that. Also connecting 2 speakers to one output changes their impendance depending if you connect them in parallel/series.
Bad configuration may fry amp/damage speakers.

Found some calc for that
http://www.bcae1.com/spkrmlti.htm

ste2425 says thanks.
14. ### ste2425

Joined:
May 27, 2008
Messages:
3,510 (1.32/day)
422
Location:
Huddersfield, uk
i new someone with better knowlege on the subject would be able to better describe what i was trying to say

15. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Ya, turns out you can do it if the sub is a dual voice coil, as you will be essentially using two internal amps from 2 bridges (ala bridging the 4 to a 2 channel) with somewhat changed impedances (as long as amp is bridging capable) to use one channel to power one coil then the other channel to power the remaining coil. If it is just a SVC sub which I have been informed it is, it cannot be done as double bridging causes too much impedance load on the amp, and will cause shorts and/or you will be left with a smelly mess of smoke and fire in the amplifier.

16. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Technically a double post, but hopefully someone will reply. I would just like some opinions on the subwoofer I now have on order. Looked around a bit at HSU, Dayton, SVS, B&W, PSB, Polk Audio, Wharfedale and Emotiva, but finally I decided to go with an Elemental Designs A2-250 subwoofer. Seems to go really low, be decently accurate, is really well built and has nice bit of power to boot. The product link is located here --> http://www.edesignaudio.com/product_info.php?cPath=2_41&products_id=406 . Tell me what you think, I'm personally looking really forward to my purchase [Edit: Went with the PSB SubSonic 5i, hard to order internationally from Elemental Designs]

Last edited: Oct 17, 2010
17. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
Haven't been on in a while and decided to update pics of my system, amps are still the same atm but have got a few more subs and other speakers. subs are very underpowered because of the weak PSU but investing in a 2 frad cap to keep up the voltages.

18. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
Very good work, I think you have done quite well so far, keep it up, thumbs up

WOG-BOY says thanks.
19. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
haha thanks slowly the system will be as good as yours

20. ### meran

Joined:
Sep 7, 2010
Messages:
470 (0.26/day)
27
Location:
coool i have creative g500 5.1 with sub 130w rms and sattelite channels 36 w
my friend gave me his burnt creative s700 i used the soeakers rms 70w i didnt use the sub can i swich my sub with the s700 sub 130vs 230???

21. ### WOG-BOYNew Member

Joined:
Apr 6, 2010
Messages:
79 (0.04/day)
6
Location:
Perth, Western Australia
so you want to change the driver from one box to another? if yes they would have to be the same size sub woofer to fit in the existing hole. you would be better asking SabreWulf69, he knows a lot more about it then me. the s700 sub doesnt have to match the g500 Watt rating just needs to be higher then the g500 rms

meran says thanks.
22. ### SabreWulf69New Member

Joined:
Jan 23, 2010
Messages:
358 (0.17/day)
57
Location:
Cooloongup, Western Australia
yeah just make sure it matches the hole size, your mileage will vary, alas it should work well

meran says thanks.
23. ### F1reFlyNew Member

Joined:
Apr 12, 2010
Messages:
227 (0.12/day)
66
Location:
Indiana
How on earth do you use car audio gear in your home and keep them all sounding clean? not to mention turn it on/off with convenience?
years ago, i remember i used a battery charger, battery and hooked up some Rockford punch amp and two 12's, freaking pounded, but very power inefficient and was far from the cleanest sound.

Joined:
Jun 23, 2007
Messages:
12,592 (4.20/day)
2,494
Location:
US
Do NAD still have that very tight bass ?.

25. ### meran

Joined:
Sep 7, 2010
Messages:
470 (0.26/day)