Tube Amps / Music Electronics
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|previous: lonzo If an amp has a 4 ohm spkr out and ... -- 1140168861||View Thread|
|2/17/2006 7:43 AM|
|R.G.||Re: 4 ohm or 8 ohm - Difference in Sound?|
This is covered in the Tube Amp FAQ at GEO - http://www.geofex.com.
The differences are caused by two things - the difference in drive level and the source impedance of the amplifier.
A 4 ohm speaker output has 0.707 times the voltage of the 8 ohm output nominally, and half the impedance as seen by the speaker. A speaker driven by half the impedance of the amplifier may have a tigher bass, depending on the amount of impedance the power amplifier has and how much feedback it uses.
The 4 ohms will be a little quieter because it's driven less hard.
In addition, any speaker artifacts of breakup will be less because the speaker is driven less hard.
So there will be a sonic difference. It's not so much that the amp reacts differently as the speakers react to a different drive voltage and source impedance.
|Dave H [QUOTE]The 4 ohms will be a little ... -- 2/17/2006 9:12 AM|