This is a review and detailed measurements of the JBL HDI-3600 floor-standing 3-way speakers. It was kindly purchased by a member and drop shipped to me. They cost US $3,800 a pair.
This sample came in "piano block" which I must say, really dresses up this speaker:
The horn looks a bit plasticy (sp?) but barely so. Between the white washed oak and this color, I take this.
This is a heavy speaker and had I not bought a lift to get it nearly 6 foot high to measure, I would be hurt already! For listening tests though, I put it my shoulder and carried it two floors up to my listening room, wondering what sin I committed to be doing this in later stages of my life...
Measurements that you are about to see were performed using the Klippel Near-field Scanner (NFS). This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics and dual scan) to subtract room reflections (so where I measure it doesn't matter). It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. Both of these factors enable testing in ordinary rooms yet results that can be more accurate than an anechoic chamber. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room.
All measurements are referenced to the tweeter axis with frequency resolution of 2.7 Hz. I used a high number of scans (over 1000 measurements) which was a good thing as the soundfield this speaker generates is rather complex. In the process I made a breakthrough in low frequency measurements. See below.
Spinorama Audio Measurements
Acoustic measurements can be grouped in a way that can be perceptually analyzed to determine how good a speaker can be used. This so called spinorama shows us just about everything we need to know about the speaker with respect to tonality and some flaws:
When I first ran this test, the low frequency level had a distinct dip and the shelving on the far left was far deeper. Examining the sound field, I realized with two ports in the back and two drivers in the front plus resonances from the cabinet, there is a lot of complexity. Normally it is assumed that the wavelength of low frequency is high enough that this type of mixing doesn't matter. But it does. I compensated in the numerical analysis and dialed out most of it. The shelving on the far left could not be fixed with software fix, requiring measurements at longer distance. I don't have much more room on that front but I will experiment with future speakers. For now, I doubt that much useful output exists at 30 Hz.
And yes, this applies to previous speakers I have measured with good bit of bass, especially if they show the shelving. As I get time, I will go back and regenerate the spin data for them.
Anyway, on to our measurements, we have a pretty flat response. The only issue is a small regression from HDI-3100 in that the off-axis around the crossover point is less seamless in 3600. And we have two of them rather than one since this is a 3-way speaker.
Efficiency is higher as advertised to tune of 90 dB.
Early reflections graph shows much wider variation when we look at different directions than the HDI-1600 which had these tightly grouped:
Noticed the wide shelving down above 2 kHz. This impacts our simulated room response some:
Vertical dispersion is more of an issue here than horizontal as we see in this comparison:
It is typical to get such dips but the one in HDI-3600 is wider, allowing more notes to hit and hence be more audible. Then again its upper bass is more flat than 1600.
There are dual bindings on the back so you can split the speaker into two. The bottom connector drivers the woofer and mid-range and the upper, tweeter:
I applied partial compensation for the room below 700 Hz (can't apply full correction or it will attempt to flat the response to 20 kHz) to the woofer. This causes the bit of wiggliness between 700 and 1 kHz so ignore that.
Nice to see both the mid-range and tweeter being so clean in the crossover region. Neither seems stressed beyond their crossover point.
Distortion seems very well under control:
I have set a tentative target of 0.5% for myself and the HDI-3600 gets there in mid-frequencies where our hearing is most sensitive.
Impedance is a bit above 4 ohm which is a relief:
Horizontal directivity is good but not super wide:
Vertical though shows and amplifies the issues we have seen above:
If you look to the left of the point of the arrow, you see that the highest amplitude points down which is due to the mid-range and then woofer taking over. In other words, the acoustic center is fairly frequency dependent. Vertical alignment of the speaker relative to your ears will be important.
Finally the waterfall:
Speaker Listening Tests
I was ready to be impressed the moment I powered on the HDI-3600, and I was not! It didn't sound bad but didn't great either. I went through a bunch of tracks and same was true. With my back bothering me after lifting this thing two floors, I gave up and reclined back in my chair, only to have the fidelity improve substantially! It was then that I realized with my tall stand the HDI-1600 was placed higher than where the tweeter of the HDI-3600 was. The ideal position for the 3600 was with the ear level below the tweeter, close to mid-between tweeter and mid-range below it.
Close examination shows large variation as you move up and down close to the tweeter axis. This is why you saw the emphasis in those measurements in my review here. At standard height you have to put something under the HDI-3600 to elevated it to the right level if your seating is as low as mine. Alternatively, you can sit farther where this doesn't matter as much. Indeed as soon as I walked away, the sound become much nicer.
Bass performance and ability to get loud is impressive. I turned it up as high as I could tolerate and I could barely detect any distortion. Mind you, it won't go super deep but what is there is clean and super dynamic. Despite playing only one speaker, I had no trouble getting the entire floor and my back to resonate! These speakers will be great for home theater, able to keep up with the dynamic range of a subwoofer.
Conclusions
There seems to be a bit of a trade-off between HDI-1600 and HDI-3600. Addition of a mid-range and more bass drivers allows sensitivity to go up substantially. On the other hand, the crossover points are not as optimal. Vertically there is a narrow sweet spot if you sit with 2 to 3 height of the speaker. So be sure to experiment with that and tilt the speaker up a bit if you need.
I am going to put the JBL HDI-3600 on my recommended list. Can't give it the highest honors due to pickiness regarding vertical placement and slight regression in off-axis directivity around the crossover point.
-----------
As always, questions, comments, recommendations, etc. are welcome.
I think it is prudent that I start to save money for a hernia operation at this rate. Shipped nearly 200 pounds of speakers and gear yesterday. And today, lifted nearly half as much all over the place to make this review happen. I expect serious donations from you since health care is expensive in US : https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
This sample came in "piano block" which I must say, really dresses up this speaker:
The horn looks a bit plasticy (sp?) but barely so. Between the white washed oak and this color, I take this.
This is a heavy speaker and had I not bought a lift to get it nearly 6 foot high to measure, I would be hurt already! For listening tests though, I put it my shoulder and carried it two floors up to my listening room, wondering what sin I committed to be doing this in later stages of my life...
Measurements that you are about to see were performed using the Klippel Near-field Scanner (NFS). This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics and dual scan) to subtract room reflections (so where I measure it doesn't matter). It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. Both of these factors enable testing in ordinary rooms yet results that can be more accurate than an anechoic chamber. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room.
All measurements are referenced to the tweeter axis with frequency resolution of 2.7 Hz. I used a high number of scans (over 1000 measurements) which was a good thing as the soundfield this speaker generates is rather complex. In the process I made a breakthrough in low frequency measurements. See below.
Spinorama Audio Measurements
Acoustic measurements can be grouped in a way that can be perceptually analyzed to determine how good a speaker can be used. This so called spinorama shows us just about everything we need to know about the speaker with respect to tonality and some flaws:
When I first ran this test, the low frequency level had a distinct dip and the shelving on the far left was far deeper. Examining the sound field, I realized with two ports in the back and two drivers in the front plus resonances from the cabinet, there is a lot of complexity. Normally it is assumed that the wavelength of low frequency is high enough that this type of mixing doesn't matter. But it does. I compensated in the numerical analysis and dialed out most of it. The shelving on the far left could not be fixed with software fix, requiring measurements at longer distance. I don't have much more room on that front but I will experiment with future speakers. For now, I doubt that much useful output exists at 30 Hz.
And yes, this applies to previous speakers I have measured with good bit of bass, especially if they show the shelving. As I get time, I will go back and regenerate the spin data for them.
Anyway, on to our measurements, we have a pretty flat response. The only issue is a small regression from HDI-3100 in that the off-axis around the crossover point is less seamless in 3600. And we have two of them rather than one since this is a 3-way speaker.
Efficiency is higher as advertised to tune of 90 dB.
Early reflections graph shows much wider variation when we look at different directions than the HDI-1600 which had these tightly grouped:
Noticed the wide shelving down above 2 kHz. This impacts our simulated room response some:
Vertical dispersion is more of an issue here than horizontal as we see in this comparison:
It is typical to get such dips but the one in HDI-3600 is wider, allowing more notes to hit and hence be more audible. Then again its upper bass is more flat than 1600.
There are dual bindings on the back so you can split the speaker into two. The bottom connector drivers the woofer and mid-range and the upper, tweeter:
I applied partial compensation for the room below 700 Hz (can't apply full correction or it will attempt to flat the response to 20 kHz) to the woofer. This causes the bit of wiggliness between 700 and 1 kHz so ignore that.
Nice to see both the mid-range and tweeter being so clean in the crossover region. Neither seems stressed beyond their crossover point.
Distortion seems very well under control:
I have set a tentative target of 0.5% for myself and the HDI-3600 gets there in mid-frequencies where our hearing is most sensitive.
Impedance is a bit above 4 ohm which is a relief:
Horizontal directivity is good but not super wide:
Vertical though shows and amplifies the issues we have seen above:
If you look to the left of the point of the arrow, you see that the highest amplitude points down which is due to the mid-range and then woofer taking over. In other words, the acoustic center is fairly frequency dependent. Vertical alignment of the speaker relative to your ears will be important.
Finally the waterfall:
Speaker Listening Tests
I was ready to be impressed the moment I powered on the HDI-3600, and I was not! It didn't sound bad but didn't great either. I went through a bunch of tracks and same was true. With my back bothering me after lifting this thing two floors, I gave up and reclined back in my chair, only to have the fidelity improve substantially! It was then that I realized with my tall stand the HDI-1600 was placed higher than where the tweeter of the HDI-3600 was. The ideal position for the 3600 was with the ear level below the tweeter, close to mid-between tweeter and mid-range below it.
Close examination shows large variation as you move up and down close to the tweeter axis. This is why you saw the emphasis in those measurements in my review here. At standard height you have to put something under the HDI-3600 to elevated it to the right level if your seating is as low as mine. Alternatively, you can sit farther where this doesn't matter as much. Indeed as soon as I walked away, the sound become much nicer.
Bass performance and ability to get loud is impressive. I turned it up as high as I could tolerate and I could barely detect any distortion. Mind you, it won't go super deep but what is there is clean and super dynamic. Despite playing only one speaker, I had no trouble getting the entire floor and my back to resonate! These speakers will be great for home theater, able to keep up with the dynamic range of a subwoofer.
Conclusions
There seems to be a bit of a trade-off between HDI-1600 and HDI-3600. Addition of a mid-range and more bass drivers allows sensitivity to go up substantially. On the other hand, the crossover points are not as optimal. Vertically there is a narrow sweet spot if you sit with 2 to 3 height of the speaker. So be sure to experiment with that and tilt the speaker up a bit if you need.
I am going to put the JBL HDI-3600 on my recommended list. Can't give it the highest honors due to pickiness regarding vertical placement and slight regression in off-axis directivity around the crossover point.
-----------
As always, questions, comments, recommendations, etc. are welcome.
I think it is prudent that I start to save money for a hernia operation at this rate. Shipped nearly 200 pounds of speakers and gear yesterday. And today, lifted nearly half as much all over the place to make this review happen. I expect serious donations from you since health care is expensive in US : https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
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