What is ACD (all-channels-driven) power and why does it matter?

ACD measures watts when all channels drive a load simultaneously — which is what happens during a movie soundtrack. It runs about 60–65% of the rated 2-channel spec. A receiver advertised at 100W/ch (2ch driven) delivers roughly 65W ACD. I always use ACD for comparisons, never the headline spec. A Denon AVR-X3800H rated at 105W/ch 2ch delivers about 68W ACD — a Yamaha RX-V6A rated at 100W/ch 2ch delivers about 65W ACD. The difference is small; the difference between 65W ACD and 120W ACD is not.

AVR Receiver Matching Tool

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Find the right receiver for your speakers. Enter your speaker specs and room details, and we will match you with compatible AVRs from our database of 0 receivers.

Step 1: Your Speakers

Speaker Impedance

Sensitivityⓘ

70 dB100 dB

Min Recommended Power

1 W500 W

Channel Layout

Step 2: Room & Preferences

Listening Distance

3 ft50 ft

Target Level

Budget Min

0 $99999 $

Budget Max

0 $99999 $

Must-Have Features

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Sensitivity math: the spec nobody reads that determines how loud your system gets

How do I match a receiver to my speakers?

Three checks, in order: speaker impedance must be at or above the receiver's minimum rated impedance; the receiver's all-channels-driven (ACD) power should meet your speakers' recommended power at your listening distance; and the receiver needs enough channels for your layout. The trap most people fall into: matching by power rating instead of sensitivity — a 100W receiver into an 84dB speaker is quieter at the same volume than a 50W receiver into a 92dB speaker.

What is ACD (all-channels-driven) power?

ACD measures watts when all channels drive a load simultaneously — what actually happens during a movie soundtrack. It typically runs 60–75% of the rated 2-channel spec, varying by manufacturer and design. A receiver advertised at 100W/ch (2ch) delivers somewhere in the 65–80W ACD range; the only way to know the exact figure is to check the manufacturer's published ACD test data, which this tool uses when available. I always use ACD for comparisons, never the headline spec.

Can I use 4-ohm speakers with any receiver?

No. Many receivers under $500 are rated for 6-ohm minimum — some only 8-ohm. Driving 4-ohm speakers on an under-rated receiver causes thermal shutdown at moderate volumes and can permanently damage the output stage. Always check the impedance rating in the spec sheet, not the marketing copy.

What room correction system should I look for?

Audyssey MultEQ XT32 (Denon/Marantz mid-high tier), Dirac Live (select NAD and Arcam), and YPAO R.S.C. (Yamaha flagship) are the reference tier. Any room correction beats none, but XT32 and Dirac Live make a genuinely audible difference in untreated rooms. If your room has hard floors and bare walls, treat the room first and use correction second — not instead.

Do I need Dolby Atmos in my receiver?

Only if you're using height or ceiling speakers — layouts like 5.1.2, 7.1.4, or anything with a third number. For standard 5.1 or 7.1 without height channels, Atmos decoding in the receiver does nothing. If you plan to stay in the room for more than 3 years, get Atmos support anyway — most receivers above $400 include it.

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We run 6 compatibility checks including thermal load at your impedance.

Try the Builder

A Marantz Cinema 70s ($1,100) delivers about 32 watts all-channels-driven into 7 channels. If your speakers are 86 dB sensitive and your couch is 12 feet back, that is not enough for reference-level playback. The tool catches this before you buy.

This matching tool scores AV receivers from the CinemaConfig database against your speaker configuration, checking channel count, impedance compatibility, estimated power delivery, and features like Dolby Atmos, eARC, and room correction.

Designed for anyone building a surround system and unsure which AVR actually matches their speakers and room.

How Receiver Matching Works

The Logic

The tool evaluates each AVR across multiple criteria. Channel count must meet or exceed your layout (a 7.2-channel AVR handles 5.1 but not 5.1.4 without external amplification). Power is estimated using the ACD method: rated_2ch_watts x 0.65, then compared against the watts required for your sensitivity and distance using the same formula as the amplifier power calculator. Impedance compatibility checks that the AVR supports your speaker's nominal impedance (some budget AVRs are only rated for 8-ohm loads).

Worked Example

You want a 5.1.2 Atmos layout with KEF Q150 speakers (86 dB, 8 ohms) at 10 feet, targeting 85 dB reference. Required power: about 165 watts per channel. A Denon AVR-X3800H rated at 105W x 2ch delivers roughly 68W ACD. That falls short. The tool flags this and suggests either more sensitive speakers (like the Klipsch RP-600M II at 96 dB, which needs only 10 watts for the same setup) or adding an external amplifier.

Standards

Power ratings follow the FTC amplifier rule (requiring disclosure of test conditions), though manufacturers often test under favorable conditions. The 0.65 ACD multiplier is based on independent testing by Audioholics and Audioscience Review, which consistently shows mid-range AVRs delivering 60 to 70% of their 2-channel rating when all channels are loaded.

Limitations

The tool matches on specs, not sound quality. Two AVRs with identical power and features can sound noticeably different due to DAC quality, room correction algorithms (Audyssey vs. Dirac vs. YPAO), and amplifier topology. It also does not account for future expansion: buying a 9-channel AVR for a current 5.1 setup gives you headroom to add Atmos heights later without replacing the receiver.

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