Power needed
9.5–150 W
per channel, into 8 ohms
To hit 95 dB peaks at 3 m from a pair of Polk R400, you need at least 9.5 W a channel. Anything from about 19 W to 150 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
- -87.0 dB effective sensitivity
- 2 dB allowed for optimistic published sensitivity
- Published sensitivity 89 dB, used as 87.0 dB per watt.
WiiM Vibelink with the Polk R400
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 3 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (100 W to 200 W) - a stiff supply that copes with hard loads.
Full WiiM Vibelink specs
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Clear this amp
178 integrated amplifiers suit the Polk R400
Also show the 1 we do not recommend
1
Excellent match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
2
Excellent match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (75 W to 150 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
3
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (100 W to 200 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
4
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (100 W to 200 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
5
Excellent match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 3 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (100 W to 200 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
6
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (60 W to 120 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
7
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (60 W to 120 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
8
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (55 W to 105 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
9
Excellent match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (75 W to 150 W) - a stiff supply that copes with hard loads.
Costs more than the speakers - worth it only if you plan to upgrade them later.
10
Excellent match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (75 W to 150 W) - a stiff supply that copes with hard loads.
Costs more than the speakers - worth it only if you plan to upgrade them later.
11
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Balanced against the price of the speakers.
12
Excellent match
8 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (60 W to 120 W) - a stiff supply that copes with hard loads.
Sensible value pick against these speakers.
13
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Balanced against the price of the speakers.
14
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power rises usefully into 4 ohms (80 W to 120 W).
Costs more than the speakers - worth it only if you plan to upgrade them later.
15
Excellent match
7 dB of headroom - enough, but at the modest end for this speaker, which takes up to 150 W.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (50 W to 100 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
16
Workable with care
10 dB of headroom over what this speaker needs - peaks stay clean.
This amplifier does not publish a minimum impedance. An 8 ohm speaker is a safe bet even so.
Power nearly doubles into 4 ohms (100 W to 200 W) - a stiff supply that copes with hard loads.
Balanced against the price of the speakers.
17
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Balanced against the price of the speakers.
18
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power rises usefully into 4 ohms (70 W to 110 W).
Costs more than the speakers - worth it only if you plan to upgrade them later.
19
Excellent match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
Power nearly doubles into 4 ohms (125 W to 250 W) - a stiff supply that copes with hard loads.
Costs more than the speakers - worth it only if you plan to upgrade them later.
20
Good match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Sensible value pick against these speakers.
Showing the best 20 of 178. Narrow it with the price range below, or a different budget split.
18 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
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Balanced against the price of the speakers.
2
Good match
9 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Costs more than the speakers - worth it only if you plan to upgrade them later.
3
Good match
13 dB of headroom, far more than needed. No harm in it.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
No current price on file for this amplifier.
4
Good match
10 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Costs more than the speakers - worth it only if you plan to upgrade them later.
5
Good match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Costs more than the speakers - worth it only if you plan to upgrade them later.
6
Good match
11 dB of headroom over what this speaker needs - peaks stay clean.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Far more expensive than the speakers. Spend it on speakers first.
7
Good match
12 dB of headroom, far more than needed. No harm in it.
Rated down to 4 ohms, comfortable with an 8 ohm speaker that dips to 4.1.
No 4 ohm power rating on file, so we cannot judge current delivery.
Far more expensive than the speakers. Spend it on speakers first.
8
Good match
12 dB of headroom, far more than needed. No harm in it.
Rated down to 2 ohms - stable into anything this speaker will throw at it.
No 4 ohm power rating on file, so we cannot judge current delivery.
Far more expensive than the speakers. Spend it on speakers first.
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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 Polk R400 specs.