The Best Amplifiers for Klipsch Speakers

Almost every “best amplifier for Klipsch” recommendation starts from watts, and watts are the one thing a Klipsch speaker needs least. The whole point of a horn tweeter is efficiency: Klipsch publishes 96 dB at 2.83 V for the R-620F and the RP-6000F II, 95 dB for the R-52C centre, 94.5 dB for the RP-600M II, 93 dB for the R-51M and 90 dB for the little R-41M. Those are the highest figures on this site, and the cheapest amplifier we cover already runs out of listening room before it runs out of power. So this page ranks on what is left.

First, the watts question, so we can retire it

What takes over: the noise floor, and why it matters more here

Sensitivity is symmetrical. A speaker that turns one watt of music into 96 dB turns one watt of hiss into 96 dB as well. Our least sensitive floorstanding speaker, the ELAC Debut 3.0 DF63, publishes 87.5 dB at the same 2.83 V — so an identical amplifier is 8.5 dB noisier through the Klipsch than through the ELAC, at the same volume setting, in the same room. Residual hiss between tracks is the single most common complaint about high-sensitivity speakers and this is the whole mechanism.

Here is what the amplifiers publish, with the reference each maker chose, because the references are not the same and that matters:

Read the last row carefully. Cambridge’s 82 dB is unweighted and referenced to one watt; everyone else’s is A-weighted or IHF-A and referenced to rated output. Those are different measurements and the gap between 82 and 106 is not a 24 dB gap in audible noise — it is partly a difference in how the question was asked. We are not going to convert between them, because any conversion would require assumptions Cambridge has not published. What we will say is that it is the one figure on this page we cannot place, which on a page about noise floors is a reason it is not in the picks.

1. Onkyo TX-8470 — the quietest published figure, and it is a receiver

106 dB IHF-A from line in to speaker out, 110 W per channel rated on the FTC form across 20 Hz – 20 kHz at no more than 0.08% THD, and an isolated phono board with MM and MC positions. For a Klipsch owner that is the right set of priorities in the right order. It also has four HDMI inputs with ARC and 8K passthrough, a subwoofer pre-out and a main pre-out, which makes it the obvious box if the speakers do television duty as well — see our receiver roundup for records and TV.

Two gaps: Onkyo publishes no damping factor, and no continuous 4 Ω rating. The only other power figure on its table is 210 W at 6 Ω, 1 kHz, 10% THD — a burst measurement, not a rating. With an 8 Ω-compatible Klipsch that absence is low-risk; with a 4 Ω speaker it would not be.

2. Denon PMA-600NE — one decibel behind, with Bluetooth

105 dB with the input shorted, 45 W into 8 Ω across the full band at 0.07% THD, and Bluetooth 5.1 built in. On this page’s criterion it is a point behind the Onkyo and well ahead of everything else, and 45 W into a 96 dB speaker reaches about 103 dB at three metres, which is more than enough.

Denon is also one of only two amplifiers here that publishes a 4 Ω figure at all — 70 W at 1 kHz and 0.7% THD — and the condition deserves the asterisk Denon gives it, because 1 kHz at 0.7% is a far softer test than the 8 Ω figure’s 20 Hz – 20 kHz at 0.07%. No damping factor is published.

3. Marantz PM6007 — the one that publishes both numbers

102 dB line signal-to-noise and a damping factor of 100, stated across 40 Hz – 20 kHz into 8 Ω. It is the only amplifier here with a respectable figure on both of this page’s axes, and it is also the only one on the site that rates 4 Ω across the full band: 60 W into 4 Ω, 20 Hz – 20 kHz, both channels driven, against 45 W into 8 Ω. Every rival’s 4 Ω figure, where it exists at all, is a 1 kHz measurement.

It ranks third rather than first because three decibels of published noise floor is three decibels, and on a 96 dB speaker you will hear the difference between tracks before you hear the difference a damping factor of 100 against 240 makes.

4. Yamaha A-S501 — the highest damping factor, the lowest S/N

A damping factor of 240 is the best published figure on this site by well over double, and damping factor is the specification that describes how firmly the amplifier controls a woofer’s motion after the signal stops. Yamaha also publishes the lowest distortion here, 0.019% at 50 W into 8 Ω across the full band, and the most power of the true integrated amplifiers at 85 W.

Against that: 99 dB signal-to-noise, referenced to the CD input with the input shorted — the lowest of the four conventional amplifiers, and 7 dB behind the Onkyo. On a Klipsch that 7 dB is the trade you are making, and it is the reason this amplifier ranks first on our under-$1,000 roundup and fourth here. Note also the 4 Ω trap on its sheet: the “185 W” figure that circulates is High Dynamic Power, a short burst measurement, and Yamaha publishes no continuous 4 Ω rating at all.

5. Fosi Audio V3 — the best noise number, and it cannot tell you its power

≥ 110 dB signal-to-noise with a published SINAD of ≥ 88 dB is the best measurement claim on this page, from the cheapest product on it. The reason it ranks last is the row that is blank: Fosi publishes no 8 Ω power rating whatsoever. It publishes 300 W × 2 into 4 Ω with no distortion condition attached, states a terminating impedance range of 2 – 8 Ω, and says an 8 Ω speaker will see “meaningfully less” without saying how much less. The headline number also depends on which power supply you buy, since the published input range is DC 24 – 48 V.

Every Klipsch speaker on this site is 8 Ω compatible. So on the one amplifier with the best noise figure, the load you own is the load its maker declined to characterise. It is still a remarkable amount of amplifier for the money, it has no phono input, and we would buy it with clear eyes.

The impedance gap all of this rests on

One caveat applies to every pick above, and it is Klipsch’s to fix rather than ours. No Klipsch speaker on this site publishes a minimum impedance. The impedance row on every spec sheet we read says 8 Ω “compatible” — Klipsch’s own word, and not a measured nominal figure. A real speaker’s impedance dips below its nominal value somewhere, and the depth of that dip is what actually stresses an amplifier. Not knowing it is why the two amplifiers that publish full-band 4 Ω behaviour (Marantz) or any 4 Ω figure at all (Denon) carry a little insurance the others do not.

Klipsch is not alone in this. Of all the passive speakers in our registry only the Q Acoustics 3030i publishes a minimum impedance, and our impedance explainer covers what the gap means in practice. Our sensitivity explainer covers why 2.83 V and “1 watt” are not the same claim.

How we would choose

Records, television and the quietest published noise floor: the Onkyo TX-8470. Records and streaming over Bluetooth, in a smaller room: the Denon PMA-600NE. A speaker whose impedance you suspect dips, or a desire for both numbers to be good: the Marantz PM6007. Lowest distortion and firmest woofer control, accepting 7 dB more published noise: the Yamaha A-S501. The least money by a long way, accepting that you will not know what it makes into 8 Ω: the Fosi V3.

And if your Klipsch speakers are the small ones — the R-41M at 90 dB rather than the towers at 96 — the sensitivity advantage shrinks by 6 dB and the ordinary power argument starts to matter again. Our high-sensitivity roundup ranks the speaker side of this question.