Go Back   Computer Forums > Welcome To Computer Forums .org > Social Lounge | Off Topic
Click Here to Login
Join Computer forums Today


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-10-2009, 11:07 AM   #11
Daemon Poster
 
vaio-fx's Avatar
 
Join Date: Jul 2007
Posts: 515
Default Re: Speaker ohms - how many am I using?

Thanks for the help. I tried just playing each set by themselves on volume 15/30 and comparing what I heard. The ProSound Speakers were noticeably louder at this volume, after plugging both sets in together, it wasn't really any louder (altho definately wasn't quieter) but I then got the bass (The Sony Speakers have subwoofers, prosound do not). So I'm using 8 ohms resistance which is fine? I think that even if I used one set on this amp they would still be underpowered as I think its only 100W per channel, sony speakers are 105W each and the Prosound ones just say "200W" on the back of them, but once again I don't know if this is per set of individually, on the website it says thats the 12 Inch prosound speakers are 400W, these are 12inch but have a different model number. I would happily just use the prosound ones but then I loose all the bass, thats why I can't use just one set.
__________________

__________________
DESKTOP: Custom Build - HAF 932: Microsoft Windows 7 Home Premium 64-Bit / Samsung 2433 24" LCD 1920x1200/ 6144 MB RAM DDR3 1600MHz Corsair Dominator/ XFX GTX 260 XXX Edition 896MB/ Intel Core i7 950 @ 4.01GHz/ 500GB Sata II 7200 RPM & 320GB 7200RPM/ 700W Jeantech Storm Modular PSU
vaio-fx is offline   Reply With Quote
Old 09-10-2009, 11:56 AM   #12
Site Team
 
root's Avatar
 
Join Date: Mar 2004
Posts: 8,006
Default Re: Speaker ohms - how many am I using?

Quote:
Originally Posted by sniperviper21 View Post
who has the degree in Electronics here?

Me, thats who.

And me...


let's have a look at what you said.

2 8Ohm speakers in parallel give a total (nominal) impedance of 4Ohms. (FACT)

This is too little to get the full sound (ASSUMPTION -not necessarily fact).
that'd rather depend on the amplifier. if his amplifier is designed to drive a 4 ohm load then it'll work best when the load is 4 ohms (1 4 ohm speaker, 2 8 ohm speakers, 4 16 ohm speakers etc).. if it's designed to drive 8 ohms then it'll work best at 8 ohms as you asserted above.

Quote:
Sorry I know you have all explained this to me before but I still don't understand. Ok, the current speaker situation is 3x 8 Ohm surround speakers connected to my amp's 3 surround sockets (these can be ignored for now), but then my 2 Sony XB80AV speakers and my 2 ProSound 200W speakers. These 4 larger speakers are connected to the amplifier's stereo sockets (2 speakers per socket). I know this is overloaded but I can't afford a new amp. Each speaker says on the back of it that it is 8 Ohms but I have no idea is this is per speaker or per set of 2. The amplifer says it can take 8-16ohms in these sockets and doesnt appear to be getting hot even at full volume, but I think the speakers are greatly underpowered, I'm sure the amp is only 100W per channel. So I was wondering if anyone could help me work out the resistance and how badly underpowered the speakers are? Thanks
the rated impedance is per enclosure written on the back.

if the speaker says 8 ohms, then that cabinet/box is 8 ohms, whether that's 2 16 ohm speakers in parallel, or 2 4 ohm speakers in series, of even 2 8 ohm speakers wired through a cross over to split up the frequencies so that the apparent impedance to a given frequency is 8 ohms.

if it says 8 ohms on the back of a box, that box is 8 ohms, when it's wired as the manufacturer first wired it with the original speaker, (if you've changed the internals about then it'll be as you;re re-wired it), but we'll assume that you haven't.

I'd suggest that if your amp can drive 8 - 16 ohms that you either only wire one of the set of speakers into the sockets on the back.

OR

you wire the two 8 ohm speakers in series to make 16 ohms rather than in parallel to give 4 ohms.

the amp might not get hot, there might be some thermal protection circuits working and limiting the output and that might be why it's not as loud as you expect it to be.


does the amp sound better with only 2 speakers, rather than loading it with 4 speakers wired up to give a 4 ohm load?
__________________

__________________
I didn’t fight my way to the top of the food chain to be a vegetarian…
Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns.
"The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."
root is online now   Reply With Quote
Old 09-10-2009, 02:14 PM   #13
Daemon Poster
 
vaio-fx's Avatar
 
Join Date: Jul 2007
Posts: 515
Default Re: Speaker ohms - how many am I using?

It definately sounds better with all 4 speakers. Also the amp does get hot, but only after a very long time of blasting full volume on a very bassy song, which by the time it get's to that sort of heat, I would have usually stopped anyway. So the sony speakers add up to 16ohms, but I'm not sure about the prosound ones, only one has a sticker stating its impedance on the back, it could have fallen off the other one, i have no idea. Don't get me wrong, these are very loud, but my friend seems to think that they should be a lot louder and i think he may be right as they are crisp clear on the amp's max, which would suggest they have more in them (I'm talking more about the Prosound ones here, I think the Sony ones are close to their max)
__________________
DESKTOP: Custom Build - HAF 932: Microsoft Windows 7 Home Premium 64-Bit / Samsung 2433 24" LCD 1920x1200/ 6144 MB RAM DDR3 1600MHz Corsair Dominator/ XFX GTX 260 XXX Edition 896MB/ Intel Core i7 950 @ 4.01GHz/ 500GB Sata II 7200 RPM & 320GB 7200RPM/ 700W Jeantech Storm Modular PSU
vaio-fx is offline   Reply With Quote
Old 09-10-2009, 03:50 PM   #14
Golden Master
 
ArrizX's Avatar
 
Join Date: Apr 2005
Posts: 16,073
Send a message via MSN to ArrizX
Default Re: Speaker ohms - how many am I using?

This thread is full of lol.
__________________
. ()()()()
./l ,[_\_\ ],
l---L – ()lllllll()-
()_) ()_)--o-)_)
ArrizX is offline   Reply With Quote
Old 09-10-2009, 04:44 PM   #15
Golden Master
 
01001010's Avatar
 
Join Date: Oct 2005
Posts: 7,888
Default Re: Speaker ohms - how many am I using?

Those ratings are used to cover peaks. They're not continuous. Most speakers are pretty loud when they have one watt delivered to them.

Quote:
Originally Posted by vaio-fx View Post
on the website it says thats the 12 Inch prosound speakers are 400W, these are 12inch but have a different model number. I would happily just use the prosound ones but then I loose all the bass, thats why I can't use just one set.
I'll tell you this again - those speakers will probably fail at 200 watts, let alone 400 watts. That isn't a reputable brand, and those aren't reputable speakers.

Quote:
(The Sony Speakers have subwoofers, prosound do not)
A tower with a built in subwoofer is very different than an independent subwoofer. I suggest you buy a powered subwoofer to take the load off your receiver.
__________________
Stop the genocide now.
↳ www.savedarfur.org

Send comments, suggestions and criticisms.
↳ 01001010listens@gmail.com
01001010 is offline   Reply With Quote
Old 09-10-2009, 06:35 PM   #16
Daemon Poster
 
vaio-fx's Avatar
 
Join Date: Jul 2007
Posts: 515
Default Re: Speaker ohms - how many am I using?

Ok, fair enough if they fail at 200W, I was just expressing the fact that I'm unsure of their wattage and I have little to work with. I had a look at subwoofers earlier actually as I think they may be a good route.
__________________
DESKTOP: Custom Build - HAF 932: Microsoft Windows 7 Home Premium 64-Bit / Samsung 2433 24" LCD 1920x1200/ 6144 MB RAM DDR3 1600MHz Corsair Dominator/ XFX GTX 260 XXX Edition 896MB/ Intel Core i7 950 @ 4.01GHz/ 500GB Sata II 7200 RPM & 320GB 7200RPM/ 700W Jeantech Storm Modular PSU
vaio-fx is offline   Reply With Quote
Old 09-11-2009, 04:53 AM   #17
Site Team
 
root's Avatar
 
Join Date: Mar 2004
Posts: 8,006
Default Re: Speaker ohms - how many am I using?

maximum power rating means the maximum amount of power they can handle, not what they should be driven at....


that's like saying that your car is capable of 150 MPH, it doesn't mean that you should drive everywhere at 150... aside from the fact that'd be dangerous, the handling would be shit, the ride comfort would be shit and the car really wouldn't last that long...


get your 200w speakers, and drive then at a full 200w all the time then they'll sound pretty shit, and it won't be long before they give out.

I'm not trying to sound really high and mighty here, but really if you want the stereo system to sound good, you might actually have to get some good compoments, and set it up as it's meant to be set up, (Like one 8ohm speaker at the 8ohm speaker post not lots all tied together).

as it is you've got an amplifier, that you already said in previous threads wasn't all that, with a bunch of speakers, that you've already said isn't all that. hooked up in a configuration that really doesn't suit the amplifier and is loading it.

you surely aren't expecting studio reference amp/speaker type sound quality,
and surely you're not expecting stadium filling amounts of sound and loudness?
if you are then you'll always be sadly disappointed.

I'm not saying that you need to go out and spend thousands, but you should probably start by hooking up what you've got correctly in the first place...


really, if you want the set-up to sound loud you're probably going to find it's the amplifier that's the problem here, not your vast array of speakers.
__________________

__________________
I didn’t fight my way to the top of the food chain to be a vegetarian…
Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns.
"The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."
root is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off



All times are GMT -5. The time now is 01:26 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.0