Power needed
38–600 W
per channel, into 4 ohms
To hit 95 dB peaks at 3 m from a pair of Magnepan 20.7x, you need at least 38 W a channel. Anything from about 75 W to 600 W a channel is comfortable; past that, more watts stop buying you anything.
Show the working
- 95 dB target at the seat
- +4.8 dB for 3.0 m of distance
- -3 dB for a stereo pair
- -81.0 dB effective sensitivity
- 3.0 dB taken off to convert the 4 ohm 2.83V rating to dB per watt
- 2 dB allowed for optimistic published sensitivity
- Published sensitivity 86 dB, used as 81.0 dB per watt.
Rotel RA-1592 MKII with the Magnepan 20.7x
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (200 W to 350 W).
Full Rotel RA-1592 MKII specs
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Clear this amp
145 integrated amplifiers suit the Magnepan 20.7x
Also show the 34 we do not recommend
1
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (200 W to 400 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
2
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
3
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (200 W to 380 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
4
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (200 W to 380 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
5
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
Power nearly doubles into 4 ohms (200 W to 400 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
6
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
7
Good match
12 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (300 W to 550 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
8
Good match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (150 W to 250 W).
Sensible value pick against these speakers.
9
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (150 W to 300 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
10
Good match
12 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (300 W to 580 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
11
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (185 W to 275 W).
Sensible value pick against these speakers.
12
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (210 W to 340 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
13
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (200 W to 350 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
14
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (180 W to 300 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
15
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (200 W to 350 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
16
Good match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (300 W to 450 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
17
Good match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
18
Good match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Well below the speakers - leaves money on the table, but nothing wrong with it.
19
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (190 W to 280 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
20
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
Power rises usefully into 4 ohms (180 W to 270 W).
Well below the speakers - leaves money on the table, but nothing wrong with it.
Showing the best 20 of 145. Narrow it with the price range below, or a different budget split.
17 power amplifiers that would also drive them
Listed separately because they are not a complete system: a power amplifier has no volume control and no inputs to speak of, so you need a preamplifier or a streaming preamp as well. Worth it if you already own one, or if you want to buy the two halves separately.
1
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
2
Good match
7 dB of headroom - enough, but at the modest end for this speaker, which takes up to 600 W.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
No current price on file for this amplifier.
3
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
4
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
5
Workable
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
6
Workable
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
7
Workable
7 dB of headroom - enough, but at the modest end for this speaker, which takes up to 600 W.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
8
Workable
7 dB of headroom - enough, but at the modest end for this speaker, which takes up to 600 W.
Rated down to 4 ohms, comfortable with a 4 ohm speaker.
No 4 ohm power rating on file. On a 4 ohm speaker that is the figure that matters, so this one is unproven on the load.
Well below the speakers - leaves money on the table, but nothing wrong with it.
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Sensitivity and impedance figures are the manufacturer's own. We read sensitivity as dB at 2.83 V/1 m and take 2 dB off it, because published figures run high. Treat the result as a well-founded starting point, not a measurement. Full Magnepan 20.7x specs.