Buckeye Amps

By measurement, the Hypex and Purifi modules are not merely competitive — they beat most Class AB amplifiers on distortion and signal-to-noise, while running roughly 95 percent efficient against about 60 percent for a typical Class AB design. That efficiency is why an eight-channel Buckeye weighs around 16 pounds where an equivalent Class AB amplifier is closer to 90, and why it runs cool enough to live in a closed cabinet.

The skepticism is earned, though, and worth acknowledging: early Class D genuinely did sound the way its reputation suggests. What changed is the modules, and implementation still matters — a good module in a careless chassis with a poor power supply is not the same product. That is the part a builder either gets right or does not.

NCore is the established Hypex line and the basis of most multichannel builds — the NC502MP at 500 watts a channel in two to eight channel configurations, plus the NC2K monoblock at 2500 watts. NCoreX is Hypex's newer generation: the NCx500 at 700 watts in monoblock, two and three channel builds, and the NCx252MP at 250 watts in two, four, six and eight channel builds.

Purifi's Eigentakt modules are the other branch — the 1ET6525SA at 510 watts in monoblock through three channel builds, and the 1ET9040BA monoblock at 1400 watts. All of them measure far better than they need to for the job. Choosing between them is mostly about how much power a given channel actually needs and how many channels you want in one box, which is a system design question rather than a sound quality one.

For the MP-series modules, because they come from Hypex as stereo boards and Buckeye stock only those, buying in larger quantities to keep the price down. A four channel NC502MP therefore costs about what a three channel build would, so the odd counts are not worth offering.

If that leaves a channel unused, nothing is wrong — an idle channel costs nothing and affects nothing. The NCx500 and the Purifi 1ET6525SA are built from single-channel modules, so those are available in three channel configurations if a clean front-three amplifier is what you want.

Usually less than the numbers suggest. Speaker sensitivity does most of the work — every 3 dB is half the power for the same level — and distance does most of the rest, since every doubling of it costs 6 dB, which is four times the power. A surround or height channel a couple of meters away is asked for a fraction of what a front channel four meters away needs, which is exactly why Buckeye's lower-power builds exist.

Our Audio Power Calculator will put a figure on it for your speakers and your room.

You do not have to, and we would rather say so. Buying direct is straightforward and Buckeye's own support is well regarded — they are genuinely active on ASR and AVS Forum, which is more than most manufacturers can claim.

What we add is upstream of the purchase: working out how many channels the layout needs now and later, which power level belongs on which channel, how the amplifier fits the rack and the processor, and then installing and configuring it as part of a system rather than as a box that arrived. On a multichannel build those decisions are worth more than the choice of amplifier.

Buckeye's published warranty covers any problem free for the first three years, including shipping both ways. After that, minor parts like wiring and connectors are still replaced free, while major parts such as amplifier modules and boards are charged at the cost of the part, with the customer covering shipping.

The more interesting detail is that everything inside is plug and play — no soldering — so a repair can be a part shipped to you rather than the amplifier shipped away. Their return policy runs 30 days, with a restocking fee on non-defective returns and custom powder coat or anodized finishes excluded as specialty items.

This is the main reason to use an external amplifier at all. A receiver's advertised power is an 8-ohm figure measured with two channels driven, so with every channel working there is much less available per channel than the number implies, and lower impedance loads are where it gives out first. A dedicated amplifier is not subject to that.

If your speakers are the reason you are asking, our JTR Speakers page works through where the line falls for a very efficient 4-ohm range — the answer there is not simply "more watts."

We carry both and have no reason to steer you either way, so the honest answer is that they solve different shapes of problem. Emotiva covers processing as well as amplification, so a single conversation can settle the processor, the amplifiers and room correction together, and their newer processors bundle the Dirac suite.

Buckeye does one thing: amplification, built on modules chosen for measured performance, in whatever channel count the room needs. If the processing is already decided, or you want the amplifier stage chosen on its own merits, that focus is the argument. If you are specifying a room from nothing, the wider ecosystem often wins on simplicity.