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Revel C52 Speaker Review and Measurements
- Thread starter amirm
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Earth's magnetic fields probably don't align with the true north in that location either.Not to mention temperature and relative humidity...
Imagine for squiggly term we have to look up those curves measured for Kali IN-8 review
...That said think squiggly is relative term from person to person so hard for me tell which is perceived most squiggly, black curves is ASR sites new NFS wonder tool using the relative high quality physical txt-file amirm hanged on into post #1 and purple curves are manual traced from the anechoic MLSSA image into post #1, that image is a little rough in quality and had to be tilted a tiny bit to right side so the purple curves get their own little finer signature of squiggles relative to the pure quality of amirm's txt-files.
Congratulations on another good speaker review! Also props for showing comparative graphs from other people to show how similar your measurements are. I know speaker measurements are time consuming so I hope you have enough time to continue to do so.
spacevector
Addicted to Fun and Learning
Why the panther didn't show?
This is an outstanding result for a horizontally oriented CC speaker. The key challenge with this driver topology is that the woofer array is ~6-7" tall but ~12-24" wide. This gives dramatically different directivity characteristics in these two axis, along with very narrow dispersion in the horizontal plane, which is probably not what you want for a CC. The MTM type speakers, having only a tweeter between the woofers, simply don't work well, but this speaker is a great example of how using a robust midrange allows the directive characteristics to be smoothed.
Why robust? Well the midrange has an interesting job in this speaker. In order to smooth directivity, it needs to go down as low as possible to reduce the upper range beaming from the woofer array. On the other hand, to make the woofer array as narrow as possible, you want it to be as small as possible, to reduce the space between the two woofers! This is a very hard balance to strike, especially if you want it to produce serious SPL.
On top of it all, Revel has also used the space between the woofers to fit a large and respectably deep waveguide for the tweeter, allowing smooth directivity hand-off between the mid and treble units.
This is not an easy design to pull off, but this is a premium product made by people who know what they're doing. I think you will find that other CC speakers fare far worse.
Why robust? Well the midrange has an interesting job in this speaker. In order to smooth directivity, it needs to go down as low as possible to reduce the upper range beaming from the woofer array. On the other hand, to make the woofer array as narrow as possible, you want it to be as small as possible, to reduce the space between the two woofers! This is a very hard balance to strike, especially if you want it to produce serious SPL.
On top of it all, Revel has also used the space between the woofers to fit a large and respectably deep waveguide for the tweeter, allowing smooth directivity hand-off between the mid and treble units.
This is not an easy design to pull off, but this is a premium product made by people who know what they're doing. I think you will find that other CC speakers fare far worse.
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So, are we saying, that because of the additional midrange driver, vertical lobing would be negated when these are positioned in an upright (I guess this is upright for a center speaker) position, and thus, could be used as L-R speakers as well?
Hmm..
Wouldn't in that case current vertical reflections become horizontal, and those are not so stellar.
Large dip around 2000Hz is where XO is and that smaller dip visiblle in every graph is also actually result of vertical non linear reflections.
Yeah, what's so impressive about this speaker is that it essentially has the radiation pattern of a good vertically aligned speaker despite being a long center. This is rare; most center speakers have good vertical directivity and poor horizontal drectivity instead. As we know, the latter is more important, but center speakers usually make that sacrifice in order to be able to fit under a TV, since they're used in conjunction with stereo speakers anyway. The revel doesn't appear to be making any major sacrifices thanks to clever engineering.
While that is true my point was that all of that would not come to play if you put it vertically on a stand as a standard stereo speaker. This speaker was designed to be placed horizontally, the way Amir mesaured it.
OP
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A pair of transmission line subs from Wisdom.
Here is a thing that bugs me, and I'm not saying that I suspect this to be another bug in the software - I would simply like to hear an explanation.
How comes that shallow dip at 800-1000Hz in vertical reflections chart found it's way to the listening window and much larger dip at 2100Hz didn't? Neither of them exists in horizontal reflection chart (middle graph).
How comes that shallow dip at 800-1000Hz in vertical reflections chart found it's way to the listening window and much larger dip at 2100Hz didn't? Neither of them exists in horizontal reflection chart (middle graph).
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D
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@amirm & @Thomas savage , miracle workers in the audio space!
So glad I joined your journey from the start. Few bumps on the road, excellently managed!
Take care both of you.
/Lars
So glad I joined your journey from the start. Few bumps on the road, excellently managed!
Take care both of you.
/Lars
It is just what the midrange aligned vertically with the tweeter does. Another trick effect is increased horizontal directivity of double woofers - totalling extremely well behaved hor. dispersion! It is so sad that most C speakers are two-ways.
Similar 3-way centers also available from B&W, Focal, NHT, Bryston, Paradigm etc.
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That's what I was wondering...would be neat to see these measured again on stands in a horizontal position. Just for kicks because Amir has so much time on his hands.
sam
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The "normal" Klippel used for measuring transducers can also measure the impulse response and diaphragm excursions, which I think it's only necessary for engineering purposes.
Not sure if this can also be done with NFS, but it will be great if we can also see the impulse response of woofers and midranges.
Transducers mounted on one enclosure and separating each linked speaker to one binding post will be an issue though.
Not sure if this can also be done with NFS, but it will be great if we can also see the impulse response of woofers and midranges.
Transducers mounted on one enclosure and separating each linked speaker to one binding post will be an issue though.
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