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Measurements of Amphion One18 and Amp500

JIW

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From Sound & Recording.

Those are/were quite popular with audio professionals - even hyped. Can't quite see why.

Price is 2700€ for the speakers and 1560€ for the amp. A pair of Neumann KH310A costs about 750€ less and is much more accurate. Similarly, a pair of Genelec 8350 with GLM kit costs about 300€ less and is also more accurate. For 400€ more, one could even get Genelec 8331 with GLM kit which are more accurate and have exceptional dispersion.

ONE18-IMP-580x442.jpg

ONE18-FRE-580x442.jpg

ONE18-MAX-580x434.jpg

ONE18SPC-Spek-580x434.jpg

One18-hor-580x357.jpg

One18-ver-580x357.jpg

ONE18-MLT-580x442.jpg



Power at 2x4Ohm. Striped: 100 Hz. Straight: 1 kHz. Dotted: 6.3 kHz. Measured with APx555 and AES17- and AUX-0025-low-pass-filters.
AMP500-THDP4-580x435.jpg

SINAD at 5W is between 90 dB and 94 dB and clipping point seems to be around 250 W at SINAD of 60 dB. Residual noise seems to be around 27 µV giving a 5 W SNR of 104 dB and SNR at 1% THD+N (320 W) of 122 dB. While noise is fairly low, this is still far from impressive for 1560€ and the March Audio P502 delivers similar performance at about 60% less price ($1075 is 966€).


Frequency range: 56 Hz – 19,3 kHz (–6 dB)
Deviation: ±3 dB (100 Hz — 10 kHz)
horizontal opening angle: 120 degrees (–6 dB Iso 1 kHz — 10 kHz)
horizontal standard deviation: 18,3 degrees (–6 dB Iso 1 kHz — 10 kHz)
vertical opening angle: 127 degrees (–6 dB Iso 1 kHz — 10 kHz)
vertical standard deviation: 20 degrees (–6 dB Iso 1 kHz — 10 kHz)
max. usable SPL: 101 dB (3% THD 100 Hz — 10 kHz)
Bass ability: 94,3 dB (10% THD 50 — 100 Hz)
Max level at 1 m (free field) with EIA-426B Signal at full scale: 94 dBA Leq and 109 dB Peak
Paar deviation: 1,7 dB (Max value 100 Hz — 10 kHz)
Noise level (A-weighted.): 3 dB SPL with Amp500 at 10 cm distance.
Dimensions / Mass: 191 x 380 x 305 mm (W x H x D) / 12 kg
 

Ilkless

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From Sound & Recording.

Those are/were quite popular with audio professionals - even hyped. Can't quite see why.

Price is 2700€ for the speakers and 1560€ for the amp. A pair of Neumann KH310A costs about 750€ less and is much more accurate. Similarly, a pair of Genelec 8350 with GLM kit costs about 300€ less and is also more accurate. For 400€ more, one could even get Genelec 8331 with GLM kit which are more accurate and have exceptional dispersion.

ONE18-IMP-580x442.jpg

ONE18-FRE-580x442.jpg

ONE18-MAX-580x434.jpg

ONE18SPC-Spek-580x434.jpg

One18-hor-580x357.jpg

One18-ver-580x357.jpg

ONE18-MLT-580x442.jpg



Power at 2x4Ohm. Striped: 100 Hz. Straight: 1 kHz. Dotted: 6.3 kHz. Measured with APx555 and AES17- and AUX-0025-low-pass-filters.
AMP500-THDP4-580x435.jpg

SINAD at 5W is between 90 dB and 94 dB and clipping point seems to be around 250 W at SINAD of 60 dB. Residual noise seems to be around 27 µV giving a 5 W SNR of 104 dB and SNR at 1% THD+N (320 W) of 122 dB. While noise is fairly low, this is still far from impressive for 1560€ and the March Audio P502 delivers similar performance at about 60% less price ($1075 is 966€).


Frequency range: 56 Hz – 19,3 kHz (–6 dB)
Deviation: ±3 dB (100 Hz — 10 kHz)
horizontal opening angle: 120 degrees (–6 dB Iso 1 kHz — 10 kHz)
horizontal standard deviation: 18,3 degrees (–6 dB Iso 1 kHz — 10 kHz)
vertical opening angle: 127 degrees (–6 dB Iso 1 kHz — 10 kHz)
vertical standard deviation: 20 degrees (–6 dB Iso 1 kHz — 10 kHz)
max. usable SPL: 101 dB (3% THD 100 Hz — 10 kHz)
Bass ability: 94,3 dB (10% THD 50 — 100 Hz)
Max level at 1 m (free field) with EIA-426B Signal at full scale: 94 dBA Leq and 109 dB Peak
Paar deviation: 1,7 dB (Max value 100 Hz — 10 kHz)
Noise level (A-weighted.): 3 dB SPL with Amp500 at 10 cm distance.
Dimensions / Mass: 191 x 380 x 305 mm (W x H x D) / 12 kg

Yawn. Another mediocre active monitor propped up by a cult of personality - think ATC and PMC. Infuriating to see them constantly propped up.
 
OP
J

JIW

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Yawn. Another mediocre active monitor propped up by a cult of personality - think ATC and PMC. Infuriating to see them constantly propped up.

They are actually passive using a passive crossover and external amps. Different than the JBL M2 or 705/8i which use external amps but active crossovers.
 

songOVERsound

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Yawn. Another mediocre active monitor propped up by a cult of personality - think ATC and PMC. Infuriating to see them constantly propped up.
I often see biased posts like this, followed by several likes on here..

Anyways, I was also biased in that I thought their point source claim was untrue but these measurements show really good vertical directivity
 

Ilkless

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I often see biased posts like this, followed by several likes on here..

Anyways, I was also biased in that I thought their point source claim was untrue but these measurements show really good vertical directivity

Last I checked a 550Hz 3dB peak smack in the midrange wasn't necessary for good vertical directivity. Nor can anything with such a peak pretend to be accurate
 

MAB

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I often see biased posts like this, followed by several likes on here..

Anyways, I was also biased in that I thought their point source claim was untrue but these measurements show really good vertical directivity
I thought the speakers' response measurements look very odd. And they sell at fairly premium prices. So this is a reasonable hypothesis, and not the first speaker that attracts some strong brand identity. I find many of their marketing claims rather suspect.
But for sure the directivity looks good. But the frequency response is going to stand out like a sore thumb. I think it's OK to expect way more, right?:)
All that being said, it does look like user-applied EQ can help this speaker, assuming the rest of the data is accurate.
The thread is a few years old, any new data to share?
 

songOVERsound

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I thought the speakers' response measurements look very odd. And they sell at fairly premium prices. So this is a reasonable hypothesis, and not the first speaker that attracts some strong brand identity. I find many of their marketing claims rather suspect.
But for sure the directivity looks good. But the frequency response is going to stand out like a sore thumb. I think it's OK to expect way more, right?:)
All that being said, it does look like user-applied EQ can help this speaker, assuming the rest of the data is accurate.
The thread is a few years old, any new data to share?
I didn’t even notice the frequency response having that. Looks odd for sure. To be fair, amphions own measurements share this, so at least they aren’t hiding it.

I actually came across this because I didn’t know of any measurements done by anyone on Amphion speakers, so after seeing the vertical directivity, I only have questions.

Now that I know that speakers that DONT have coaxial drivers, I am now curious why more regular speakers with separated drivers don’t have a point source directivity (good vertical)

Amphion crossover is at 1,600 hz.
DD8C is at 1250 hz, yet doesn’t have nearly the as good vertical directivity.
 
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MAB

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Not for the One18, but there are some measurements of Amphion’s home-marketed variant by some schlub here;

Thanks!
Instead of the pointless “more treble” switch, an option for a broad cut of about 2dB centered at about 10kHz would be a very nice addition to the Argon 3S.
Made me laugh and agree at the same time.
 

MAB

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I didn’t even notice the frequency response having that. Looks odd for sure. To be fair, amphions own measurements share this, so at least they aren’t hiding it.

I actually came across this because I didn’t know of any measurements done by anyone on Amphion speakers, so after seeing the vertical directivity, I only have questions.

Now that I know that speakers that DONT have coaxial drivers, I am now curious why more regular speakers with separated drivers don’t have a point source directivity (good vertical)

Amphion crossover is at 1,600 hz.
DD8C is at 1250 hz, yet doesn’t have nearly the as good vertical directivity.
Yeah, it's a mixed bag.
I want to like them a bit more.

I will admit, the vertical spin data confuses me given the large DI mismatch at the crossover frequency. Here is the data from Jay's review, I think the two speakers are comparable.
1709269190708.png
 
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