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The traces in figs.1 and 2 have a small wrinkle between 600 and 700Hz, suggesting the presence of a cabinet resonance in that region. However, when I investigated the vibrational behavior of the enclosure panels with an accelerometer, there was nothing untoward between 600 and 700Hz. However, there was a fairly strong mode at 309Hz on all surfaces (fig.3), and a slightly less strong one at 504Hz.Fig.3 KEF Q350, cumulative spectral-decay plot calculated from output of accelerometer fastened to center of sidewall (MLS driving voltage to speaker, 7.55V; measurement bandwidth, 2kHz).
The small blip at 39kHz in the magnitude trace in fig.1 indicates that the tweeter's fundamental dome resonance lies at this very high frequency, but the traces in this graph are otherwise free from the small lower-frequency discontinuities that would suggest the presence of cabinet resonances of some kind. Cumulative spectral-decay plots of the cabinet walls' vibrational behavior, calculated from the output of a plastic-tape accelerometer, didn't uncover any midrange resonances on any of the surfaces, though the sidewalls flexed a little at the frequency of the port tuning frequency (fig.2).Fig.2 KEF LS50, cumulative spectral-decay plot calculated from output of accelerometer fastened to center of side panel (MLS driving voltage to speaker, 7.55V; measurement bandwidth, 2kHz).
Dan S. HigginsThe Q350's Take Time to Break InI've been listening to the Q350's for about five weeks and the woofers are still not broken in; that warm speaker feel and sound hasn't come to fruition yet. I'm confident with more time they'll loosen up, and warm with time.I use an iPad Mini 4 as the sound source and have found the "rock" setting in the equalizer sounds best overall. The integrated amp I use is the Yamaha AS-801 and I need to turn the bass knob to about "two o'clock" to get the warmth I like to hear. The only track I've seen to actually work and move the woofers is Rocket Empire's 'Cruising the Galaxy', loud.
YAMAHA A-S801 Rated power (1% THD + N, 1 kHz) [W] 8 Ω, 2x 130 Rated power (1% THD + N, 1 kHz) [W] 4 Ω, 2x 132 Sensitivity (for maximum power) [V] 1x 0.22 Signal / noise ratio (A-weighted filter, with reference to 1W) [dB] 83 Dynamics [dB] 104 Damping factor (relative to 4 Ω) 94
This graph shows that the SR4500's left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1% distortion at 100.4 watts and 1% distortion at 114.6 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 128.2 watts and 1% distortion at 158.8 watts.Response from the multichannel input to the speaker output measures –0.43 dB at 10 Hz, –0.13 dB at 20 Hz, –0.11 dB at 20 kHz, and –0.67 dB at 50 kHz. THD+N from the amplifier was less than 0.015% at 1 kHz when driving 2.83 volts into an 8-ohm load. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –79.69 dB left to right and –80.28 dB right to left. The signal-to-noise ratio with 2.83 volts driving an 8-ohm load from 10 Hz to 24 kHz with "A" weighting was –100.92 dBrA.
Wonderful SpeakersBy Mike Anderson December 22, 2018These speakers sound fantastic, look wonderful, and shine at reproducing guitar. The bass is significantly more than I was expecting and on par, but much cleaner, than my old Spica TC-50's. As stated by everyone else the imaging is ridiculously good and really fun to play with. I tried out one of the main competitors (rhymes with "dorfdale") and found these more suited to my musical taste which is along the lines of Jack Johnson, Rush, and movies. Of course considered the UB5 [maty: ELAC] but settled on these. Only thing to note is that the tweeters took about an hour to warm up so dont freak out when you first set them up.
frequency response(±3dB) Measured at 85dB/1m45Hz – 28kHz (More bass extension)50Hz – 28kHz (Standard)61Hz – 28kHz (Less bass extension)Depending on speaker settings <- DSP
WEIGHTLeft Speaker 10.0kg (22.0lbs.)Right Speaker 10.2kg (22.5lbs.)
...Sound quality: Wow. It's really hard to describe how these sound because it's almost like the sound isn't coming from the speakers at all. What I can detail is how clear and crisp everything is. The highs are crisp and crystal clear. The mids are clear and warm. Then there's the bass. Do not believe in the frequency range numbers. These definitely go down beyond the claimed 51Hz. I was worried about having to get a subwoofer, coming from RP-500m's, but these produce an astonishing amount of bass for the size. Provided in the box are two bass port plugs with 2 stages: both foam pieces together or you can remove the inner foam piece for just a foam ring. My advice: put them in with just the outer foam because it tightens up the bass and makes it less boomy. All in all, these sound great. I like electronic music mostly and these are perfect for EDM or house music. Deadmau5 sounds amazing on these. Likewise, these will sound great with pretty much any genre of music.I'm powering them with a Nobsound TPA3116 100W mini amplifier and it's plenty of power. I did recently purchase an Audioengine N22 amplifier and while it sounded great with the KEFS, it unfortunately had unbalanced channels. So I'm sticking with the Nobsound for now. I'm sure these would sound much better with a high end amplifier, but it shows how forgiving these are of the power source.In conclusion, these are great for near field listening: punchy bass, warm mids, and crystal clear highs. These definitely need to be broken in because they will sound harsh during the first couple of hours. After that, they become mellow and warm sounding. It's easy to listen to and pretty to look at. Can't wait to see what KEF does in the future!
by Shane from Clay, MI on 12/27/2018These are excellent. After a Christmas shoot out with another pair of speakers that we're getting rave reviews, these beat them out immediately. They're going in my office with my Elac Unifi UB5's. That's who they compete with. Bass great. Treble is a little crisper than the Elacs which is nice. It's not overwhelming though. Soundstage is apparent right out of the box. Digital Trends got the analogy correct. If the Elac Unifi UB5 is a Chardonnay, then the KEF q150 is a smoky Pinot Noir. Right on. The Elac mids stand out a little more. The KEF's are the more laid back Brit sound. I absolutely love them. Highly recommended. Powered by an old Onkyo 809 receiver and Oppo bdp 93Pros: Great bass. Crisp highs but not etchy at all..just enough. Great soundstageCons: Not as much attack as say a horn speaker but it's really not a con. It's preference. I could listen to these for hours without fatigue.
I get very loud deep bass, they sound quite bloated and they lack definition / punchiness. I don't feel the bass when in certain sound I know I should feel it. They're currently powered by a Marantz M-CR511 (40w in 8ohms), could the problem be there?To be more specific, they're in a 20 square meters room, both on 60mm stands, 30cm from the wall...
To be more specific, they're in a 20 square meters room, both on 60mm stands, 30cm from the wall...
Ok so I spent hours listening to different musics that I know and placing the speakers at different positions in my room. I finally found something that sounded good! Without any ajustement on my receiver I finally was able to detach the voice of Jack Johnson from the bass in "Middle Man". The only problem is that it was almost in the middle of my room and facing a corridor so I could not let them there but what's sound the closest at the moment is when I place them in their original place and change the output frequency characteristics to cut the low frequencies of 60 Hz or under by –12dB/oct.Still not perfect I guess because I feel like I'm loosing some bass...but I'll try to buy another amp later if I can to see if it improves. Something like a Marantz PM6006, I heard that it might have better control than my AVR. I won't be able to try the Q350 as it's a bit over my budget at the moment and I thought that for the size of my listening room the Q150 would suffice.
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