• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Acoustic Energy AE 100.2 bookshelf speaker review

OP
I

incubus

Member
Joined
Jul 29, 2023
Messages
5
Likes
120
Location
Munich, Germany
Thank you very much to everyone answering so far. I am taking a steep learning curve here.

After minor adjustments I can provide you with a windowed measurement (4ms) without any smoothing:
AE 100.2 SPL windowed 4ms no smoothing.jpg
 
D

Deleted member 21219

Guest
Thank you very much to everyone answering so far. I am taking a steep learning curve here.

After minor adjustments I can provide you with a windowed measurement (4ms) without any smoothing:
View attachment 303315

Is it difficult for you to obtain off-axis measurements? They might be interesting.

Jim
 

Ismapics

Active Member
Joined
Nov 21, 2020
Messages
210
Likes
280
Acoustic Energy 100.2 bookshelf speaker review

Since this is my first post and my first measurement of a commercial speaker please be patient with me. English is not my mother language so my text might be bumpy to read.
I have built some speakers myself following guidelines from DIY Hifi magazines available in Germany. So far I am not very happy with the results so I started measuring my speakers.
But I am a beginner and I have found this forum and I am so happy to finally be able to move away from pure subjective description to objective measuring.
Again, this is my first analysis of a commercial speaker and I would be glad if you could give me additional advice on things I can improve.


Tempted by many positive online reviews I have bought a pair of Acoustic Energy speakers: AE 100.2 for 350 EUR (before I found this forum).
View attachment 303149View attachment 303150

Let's find out if they are truly any good using the following tools:
  • Focusrite Scarlett 2i2 3rd Gen as audio interface
  • DIY cables for impedance measurements
  • Sonarworks microphone XREF20 with calibration file
  • REW 5.20
  • Windows 11 Laptop

SPL far field (1m):
View attachment 303126

I was measuring in my garden. The speaker box was 1.2 meters from the ground and the microphone was 1m from the speaker pointed at the tweeter.
The first graph represents the measurements without any smoothing, the second graph show psychoacoustic smoothing by REW. My neighbors are friendly people and I would like them to stay that way so I was aiming for roughly 80 db. I only have a Hifi amplifier so I cannot tell the watts it was delivering.

View attachment 303127
From 60 Hz at 76 db to 2 kHz SPL is fluctuating by 5 db which is acceptable from my point of view.
Looking from 2 kHz until 20 kHz we see a relatively flat response curve rising minimally from 78 db to 82 db.
Bass down to 60 Hz at 76 db is quite good for a bookshelf speaker.


THD :

View attachment 303129
Okay, I did not drive the speaker hard to really test for distortions. Nevertheless I can provide a cart showing distortion in % including THD and harmonics from 1st to 5th.
THD stays below 2% from 50 Hz to 150 Hz and below 1% from 150 Hz onward which means the distortion is 40 db quieter than the fundamental. I think that's a good value.


SPL near field with psychoacoustic smoothing:
View attachment 303131

Near field measurements show us cross over frequency at 1.8 kHz which is far from the 2.9 kHz stated by the company. The reflex port shows a nice drop off until 430 Hz, after that SPL increases again until 880 Hz. I have no idea why.


Impedance and Phase
View attachment 303132

Impedance has lows at 4.4 Ohms and 4.6 Ohms so according to the 80% rule I would call it a 6 Ohms speaker which lines up with the manufacturers specs.
The two peaks are typical for a ported box:
1st peak at 35 Hz
2nd peak at 88 Hz
The bottom between the first two peaks at 52 Hz is the resonant frequency of the box.

The second peak is higher than the first peak. This means that fb < fs.
fb = resonant frequency of box an
fs = resonant frequency of speaker in air

There seem to be resonances (or enclosure leaks) at 356 Hz and 740 Hz. The first one is more prominent than the second one.

Phase has two lows at -41.6° and -54.3° but luckily impedance is at 11 Ohm and 13 Ohm respectively. So load for the amp should be manageable.
I have been driving the speakers with an old NAD 3020i (20 watts @ 8 Ohm) and it got sufficiently loud (80 decibel) in my living room at low power settings (approx. 30%).

Crossover frequency according to impedance curve is at 1.8-1.9 kHz which is considerably lower than manufacturer data stating 2.9 kHz.

Last but not least some additional charts:

Step response typical for a two way speaker:
View attachment 303134
Waterfall:
View attachment 303137
Conclusion:
Since I am new to speaker measurement I am somewhat afraid to give an ultimate opinion. I think the speakers are of decent value for 350 EUR for the pair.
Listening to them for a few weeks I did not get tired of them although there is an increase in SPL in the higher frequencies according to the SPL graph.
What do you think of the measurements and my analysis so far. Any comments or suggestions?
Thank for the time which the most expensive commodity. Cheers and Thank you for your review.
 
D

Deleted member 21219

Guest
Hi Jim,
although it is August, unfortunately I am experiencing a typical German summer with lots of rain for weeks.
I am going to do some more measurements once the sun comes out.
Kind regards

Considering our weather in the American Midwest right now, I understand completely. :)

Jim
 

Toni Mas

Senior Member
Joined
Jun 9, 2022
Messages
437
Likes
286
Thank you very much to everyone answering so far. I am taking a steep learning curve here.

After minor adjustments I can provide you with a windowed measurement (4ms) without any smoothing:
View attachment 303315
I dont use RWE so i dont know if It allows you to check the impulse response so that you can place the time window before the first reflectin peak.
Also you can measure closer than 1m, though you progressively lose the baffle effect as you get closer.
Averaging several measurements in a narrow window will also smoothe the response reducing the effects of very early reflexions, allowing also to check how consistent (hence reliable) your measurements are.
 

isostasy

Senior Member
Joined
Oct 19, 2022
Messages
341
Likes
602
Thanks for the review :) I have been experimenting with ground plane measurements and have managed to get results that look slightly more like amir's klippel measurements this way than trying to make quasi-anechoic measurements in my garden.
 

Theodore8

Member
Forum Donor
Joined
Apr 8, 2021
Messages
97
Likes
133
Location
Geneva, Switzerland
I have always been curious about the AE brand, as it seems to enjoy a following. Great to read your review. Thank you for this first measurement of an AE product on ASR!
 

tomtoo

Major Contributor
Joined
Nov 20, 2019
Messages
3,606
Likes
4,503
Location
Germany
For the lazy(like me)

Looks like a solid product for the price......amtlich ;)
 

Tihomir

Member
Joined
Oct 2, 2023
Messages
5
Likes
0
Acoustic Energy 100.2 bookshelf speaker review

Since this is my first post and my first measurement of a commercial speaker please be patient with me. English is not my mother language so my text might be bumpy to read.
I have built some speakers myself following guidelines from DIY Hifi magazines available in Germany. So far I am not very happy with the results so I started measuring my speakers.
But I am a beginner and I have found this forum and I am so happy to finally be able to move away from pure subjective description to objective measuring.
Again, this is my first analysis of a commercial speaker and I would be glad if you could give me additional advice on things I can improve.


Tempted by many positive online reviews I have bought a pair of Acoustic Energy speakers: AE 100.2 for 350 EUR (before I found this forum).
View attachment 303149View attachment 303150

Let's find out if they are truly any good using the following tools:
  • Focusrite Scarlett 2i2 3rd Gen as audio interface
  • DIY cables for impedance measurements
  • Sonarworks microphone XREF20 with calibration file
  • REW 5.20
  • Windows 11 Laptop

SPL far field (1m):
View attachment 303126

I was measuring in my garden. The speaker box was 1.2 meters from the ground and the microphone was 1m from the speaker pointed at the tweeter.
The first graph represents the measurements without any smoothing, the second graph show psychoacoustic smoothing by REW. My neighbors are friendly people and I would like them to stay that way so I was aiming for roughly 80 db. I only have a Hifi amplifier so I cannot tell the watts it was delivering.

View attachment 303127
From 60 Hz at 76 db to 2 kHz SPL is fluctuating by 5 db which is acceptable from my point of view.
Looking from 2 kHz until 20 kHz we see a relatively flat response curve rising minimally from 78 db to 82 db.
Bass down to 60 Hz at 76 db is quite good for a bookshelf speaker.


THD :

View attachment 303129
Okay, I did not drive the speaker hard to really test for distortions. Nevertheless I can provide a cart showing distortion in % including THD and harmonics from 1st to 5th.
THD stays below 2% from 50 Hz to 150 Hz and below 1% from 150 Hz onward which means the distortion is 40 db quieter than the fundamental. I think that's a good value.


SPL near field with psychoacoustic smoothing:
View attachment 303131

Near field measurements show us cross over frequency at 1.8 kHz which is far from the 2.9 kHz stated by the company. The reflex port shows a nice drop off until 430 Hz, after that SPL increases again until 880 Hz. I have no idea why.


Impedance and Phase
View attachment 303132

Impedance has lows at 4.4 Ohms and 4.6 Ohms so according to the 80% rule I would call it a 6 Ohms speaker which lines up with the manufacturers specs.
The two peaks are typical for a ported box:
1st peak at 35 Hz
2nd peak at 88 Hz
The bottom between the first two peaks at 52 Hz is the resonant frequency of the box.

The second peak is higher than the first peak. This means that fb < fs.
fb = resonant frequency of box an
fs = resonant frequency of speaker in air

There seem to be resonances (or enclosure leaks) at 356 Hz and 740 Hz. The first one is more prominent than the second one.

Phase has two lows at -41.6° and -54.3° but luckily impedance is at 11 Ohm and 13 Ohm respectively. So load for the amp should be manageable.
I have been driving the speakers with an old NAD 3020i (20 watts @ 8 Ohm) and it got sufficiently loud (80 decibel) in my living room at low power settings (approx. 30%).

Crossover frequency according to impedance curve is at 1.8-1.9 kHz which is considerably lower than manufacturer data stating 2.9 kHz.

Last but not least some additional charts:

Step response typical for a two way speaker:
View attachment 303134
Waterfall:
View attachment 303137
Conclusion:
Since I am new to speaker measurement I am somewhat afraid to give an ultimate opinion. I think the speakers are of decent value for 350 EUR for the pair.
Listening to them for a few weeks I did not get tired of them although there is an increase in SPL in the higher frequencies according to the SPL graph.
What do you think of the measurements and my analysis so far. Any comments or suggestions?
What is the dB SPL level of fundamental during THD measurment ? I can't find it in your post.
 
Top Bottom