View Full Version : Ohms
23-07-2003, 08:08 AM
I currently own this setup:
http://www.yamaha-audio.co.uk/homecinema/htib/htib-45/index. php (http://www.yamaha-audio.co.uk/homecinema/htib/htib-45/index.php)
All of the speakers are 6ohms each. There is a switch on the rear of my reciever for 4-6ohms and 8ohms.
I have it on the 4-6ohms. However i've heard that it's not recommended to use this setting for some reason...
What improvement would i get from having it set to 8ohms?
A hotter amp?
what do you guys think?
23-07-2003, 08:14 AM
What impedance (ohms) are your speakers?
The switch is there to give the amp an easier time of things when driving harder loads such as 4ohm speakers. If your speakers are nominal 8ohm designs then select 8ohm, you'll get no advantage from selecting 4ohm.
23-07-2003, 09:37 AM
my speakers are all 6ohms each
the article i read said that selecting 4-6ohms would lower sound qualitiy......i was wondering if any of you guys heard of this?
23-07-2003, 09:43 AM
I have just changed my rear speakers to M&K K4 which are 4ohms and my front three are all 8ohms - My amp only has two settings - one for 6ohms and one for 8ohms so I have selected the 6ohms one - I can not say about the sound quality as all my AV equipments was moved from my lounge into a dedicated room.
The AMP needs to know if it is driving a harder speaker ie lower ohms other wise it might overheat.
23-07-2003, 10:12 AM
your amp will have no trouble driving the supplied 6ohm speakers on its 8ohm setting and will supply more power for transients on this setting. don't worry about the 6ohm figure as it's a nominal (average) figure.
12-08-2003, 04:06 PM
What happens when you switch to 4 ohms is the voltage rails for the power amplifers are reduced so that less power is dissipated for the same current output.
If you use the 8 ohm setting the amplifer will run hotter as more power will be dissipated in the output transistors for the same power in the speakers. However it will as described above give slightly improved transient response.
Practical advice if you are using the amplifier for normal level listening then the 8 ohm setting will be fine and may sound a little better but it might run hot. If you want to have a party and run the amplifer for a long time, loud, it would probably be worth swiching it down to the 4 ohms setting. Don't switch the level when the amp is on though as this could damage it.
One problem you may encounter if you leave it in the 8 ohm setting is on loud bass transients the over current protection in the amplifer may switch it off. This is paticularly true if you have your speakers set to large as this means the bass energy is not filtered of and redirected to the subwoofer. Often speakers that are nominal 6 ohms may drop to 3 ohms in the bass region so very large currents can be draw.
I hope this is of some help,
12-08-2003, 06:39 PM
I know understand fully what it means. Welcome to the forum!
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