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Jamo Concert 8 in-room measurements

Ageve

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After reading this thread, I decided to measure the Concert 8 speaker. Please note that the measurements are done in room. The response below 500 Hz should be ignored.

This Concert 8 speaker was purchased new ~25 years ago. It has never been repaired or modified in any way.

Equipment used:
DAC/pre-amp: Denon AVR-X5200W (direct mode)
Amplifier: Rotel RB-1590
MiniDSP UMIK-2 calibrated microphone
Asus ROG Strix X570 Gaming motherboard (Toslink out).
REW V5.30.1

concert8.png


30cm on axis horizontal (measured between tweeter and midrange):
concert8_30cm_1.png



Psychoacoustic smoothing:
concert8_30cm_1_smoothed.png


15 deg off axis (horizontal):
concert8_30cm_15 deg hor.png


15 deg off axis (psychoacoustic smoothing):
concert8_30cm_15 deg hor smoothe.png


30 deg off axis (horizontal):
concert8_30cm_30 deg hor.png


30 deg off axis (psychoacoustic smoothing):
concert8_30cm_30 deg hor smoothed.png


All measurements above were done between the tweeter and midrange. When moving up to the tweeter axis, the level is increased:
concert8_30cm_tweeter_level.png


Tweeter axis (psychoacoustic smoothing):
concert8_30cm_tweeter_level_smoothed.png


To confirm that the measurements were correct, I measured one of my F208 speakers at tweeter axis (psychoacoustic smoothing):
f208 30cm tweeter level smoothed.png
 

fpitas

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Thanks. I'm sure everyone is stunned that Danny had no idea what he's doing.
 

fpitas

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I hope my W18s are still doing as well as yours in 10 more years ;)
 

MAB

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After reading this thread, I decided to measure the Concert 8 speaker. Please note that the measurements are done in room. The response below 500 Hz should be ignored.

This Concert 8 speaker was purchased new ~25 years ago. It has never been repaired or modified in any way.

Equipment used:
DAC/pre-amp: Denon AVR-X5200W (direct mode)
Amplifier: Rotel RB-1590
MiniDSP UMIK-2 calibrated microphone
Asus ROG Strix X570 Gaming motherboard (Toslink out).
REW V5.30.1

View attachment 338270

30cm on axis horizontal (measured between tweeter and midrange):
View attachment 338260


Psychoacoustic smoothing:
View attachment 338261

15 deg off axis (horizontal):
View attachment 338262

15 deg off axis (psychoacoustic smoothing):
View attachment 338263

30 deg off axis (horizontal):
View attachment 338264

30 deg off axis (psychoacoustic smoothing):
View attachment 338265

All measurements above were done between the tweeter and midrange. When moving up to the tweeter axis, the level is increased:
View attachment 338266

Tweeter axis (psychoacoustic smoothing):
View attachment 338267

To confirm that the measurements were correct, I measured one of my F208 speakers at tweeter axis (psychoacoustic smoothing):
View attachment 338268
Thanks for posting the measurements of your very nice speaker that doesn't need any help from the chop-shop at GR Research.
 

voodooless

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Nice! But please use decent scaling. You’re showing like 120 dB. Normal is about half of that.

Anything will look ruler flat when zoomed out ;)

Would also be nice to have all the axis in a single plot.
 

fpitas

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I would be rather stunned if one day he would do or say something fully correct.
Unless he can turn a tidy profit on that, we may wait a long time.
 
OP
A

Ageve

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Nice! But please use decent scaling. You’re showing like 120 dB. Normal is about half of that.

Anything will look ruler flat when zoomed out ;)

Would also be nice to have all the axis in a single plot.

Thanks. Updated graphs:

0, 15 and 30 deg horizontal (1/48 smoothing):
concert8_measurement_offaxis.png


0,15 and 30 deg horizontal (psychoacoustic smooothing):
concert8_measurement_offaxis_smoothing.png
 
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A

Ageve

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I did a few extra measurements today.

The frequency response is quite even at 15 deg below the tweeter (30cm distance, with microphone between tweeter and midrange, like in the measurements above).

The level is increased quite a bit when moving up, and at +15 deg there's also a dip at ~2.5 kHz (crossover?).

1/48 smoothing:
concert 8 vertical.png


Psychoacoustic smoothing:
concert 8 vertical smoothed.png


I also did an extra measurement to make sure that the first ones were correct.

30cm, between tweeter and midrange as before:
concert 8 two measurements.png


My measurements look nothing like the ones Danny Richie did in his first video, but they do match his latest measurements, at least below 9-10 kHz.

First video:

Blue line: My measurement, scaled to match his 25dB range, smoothing and 200Hz limit:
danny_vs_concert8_1.png


His latest video (red and green are two samples, not the one he measured in his first video):

Blue line: My measurement, scaled to match his 25dB range, smoothing and 200Hz limit:
danny_vs_concert8_2.png


I just watched the latest video, and now he's back to complaining about steel bolts and sand cast resistors degrading the sound quality. :/
 
Last edited:

fpitas

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he's back to complaining about steel bolts and sand cast resistors degrading the sound quality.
Without imaginary problems, he can't sell more snake oil. Those are standard audiophile nonsense.
 

fpitas

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