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new KEF KC62 dual 6.5" subwoofer

AdamG

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Keeping in the back of our minds and calculations, humans don’t hear low frequency equally in relation to the the full FR. Subs/bass needs to be from 6 to 8db higher to level match in our brain housing units. So yeah, going to need multiples I think.
 
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F1308

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I don't listen to that level. No fun. :p

My typical peaks are over 90+ dB, and I sit more than 9 ft away.

If you only listen to low volume, then your priority is different than mine. Unless you really lacking space, plenty of others much cheaper options out there for your listening level.
Just enjoying great music at comfortable levels, granting hearing health and hopefully doing it for many years to come.
 

Pdxwayne

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Just enjoying great music at comfortable levels, granting hearing health and hopefully doing it for many years to come.
Yeah, comfortable level could mean different things to different people. For my wife, it is very low level. For me, I feel more comfortable when I can "feel" the bass punch. : )
 

F1308

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I don't think this will perform at its intended specs; at best, it will be similar to my velodyne microvee sub intended for small rooms with bass-anemic speakers:

Velodyne Microvee Specifications:
● Drivers: One Active 6.5" (with 64 oz
Magnet), Two 6.5" Passive Radiators
● Amplifier: 1,000 Watts RMS
● MFR: 38 Hz - 120 Hz ± 3 dB
● Low Pass: 50 Hz - 200 Hz Adjustable
● Phase: 00 - 1800 Switchable
● Dimensions: 9" H x 9" W x 9.6" D
Weight: 15 Pounds
● MSRP: $799 USA; White or Black

However, curious as to why this new KEF doubles the weight at 30lbs.

A subwoofer that only offers 38 Hz is hard to understand for me...13-16 Hz is what I always thought they were for.
So this Kef offer is great, bearing that 11Hz capability.
 

F1308

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Yeah, comfortable level could mean different things to different people. For my wife, it is very low level. For me, I feel more comfortable when I can "feel" the bass punch. : )
I do feel the power my Mythos offer. Indeed.
No need to ring my timpani.
 

pozz

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For around same price, the Paradigm Seismic 110 can do 100db at 20 Hz at less than 6% distortion. If indeed the KEF can only do 80db max at 20 Hz, I don't see how it will be worth it....

View attachment 107775
Source of the measurements?
 

nerdoldnerdith

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I don't think this will perform at its intended specs; at best, it will be similar to my velodyne microvee sub intended for small rooms with bass-anemic speakers:

Velodyne Microvee Specifications:
● Drivers: One Active 6.5" (with 64 oz
Magnet), Two 6.5" Passive Radiators
● Amplifier: 1,000 Watts RMS
● MFR: 38 Hz - 120 Hz ± 3 dB
● Low Pass: 50 Hz - 200 Hz Adjustable
● Phase: 00 - 1800 Switchable
● Dimensions: 9" H x 9" W x 9.6" D
Weight: 15 Pounds
● MSRP: $799 USA; White or Black

However, curious as to why this new KEF doubles the weight at 30lbs.

I guarantee the KEF will be deeper and more powerful.
 

Pdxwayne

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I guarantee the KEF will be deeper and more powerful.
Can it do 110 dB at 30 Hz with less than 3% distortion? : )

paradigm-fig-15-lg.jpg
 

nerdoldnerdith

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Can it do 110 dB at 30 Hz with less than 3% distortion? : )

View attachment 107814
Sorry, I mean deeper and more powerful than the Velodyne. The Paradigm will obviously kicks its ass, but that's kind of an apples to oranges comparison. We're talking about the kind of performance that can be achieved from a tiny box, and KEF is reaching what is physically possible with their subwoofers.
 

waynel

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If I hear music most of the time at less than 60dB, topping 75dB, should I worry about those numbers showing 80 dB at 20 Hz ?
80 dB at 1 meter at 20Hz. In a typical room this will not be very audible . 100dB at listening position at 20Hz does not sound very loud.

100dB at 20 Hz sounds about as loud at 40dB SPL at 1 KHz
 

F1308

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80 dB at 1 meter at 20Hz. In a typical room this will not be very audible . 100dB at listening position at 20Hz does not sound very loud.

100dB at 20 Hz sounds about as loud at 40dB SPL at 1 KHz
I hear music made by me thanks to my Roland Fantom 8, with frequencies that can go from 8 Hz (moving the octave down from A0) to 4186 Hz (C8, no shifting here due to lack of musicality ) based on the MIDI notes I play plus their harmonics, usually ending around 12000 Hz....15000Hz.
I see the level in my smartphone meter and 60dB is just too much.
May be we are using a different scale...
80 dB at 1 meter at 20Hz. In a typical room this will not be very audible . 100dB at listening position at 20Hz does not sound very loud.

100dB at 20 Hz sounds about as loud at 40dB SPL at 1 KHz
Well, for me this measure here is more than enough.
Speakers 3 meters away.
 

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waynel

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I hear music made by me thanks to my Roland Fantom 8, with frequencies that can go from 8 Hz (moving the octave down from A0) to 4186 Hz (C8, no shifting here due to lack of musicality ) based on the MIDI notes I play plus their harmonics, usually ending around 12000 Hz....15000Hz.
I see the level in my smartphone meter and 60dB is just too much.
May be we are using a different scale...
Well, for me this measure here is more than enough.
Speakers 3 meters away.
Your smartphone is not measuring the level at 20Hz and is likely adding some weighting ( A or C weighting) . Play a 20Hz sign wave and use an SPL meter that is accurate down to 20Hz to get 80dB SPL. You wont think its loud. In fact its just above the threshold of human hearing, falling under the 20 phon curve below. This is not opinion, it is science.
https://en.wikipedia.org/wiki/Equal-loudness_contour

1611350541301.png
 
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Pdxwayne

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I hear music made by me thanks to my Roland Fantom 8, with frequencies that can go from 8 Hz (moving the octave down from A0) to 4186 Hz (C8, no shifting here due to lack of musicality ) based on the MIDI notes I play plus their harmonics, usually ending around 12000 Hz....15000Hz.
I see the level in my smartphone meter and 60dB is just too much.
May be we are using a different scale...
Well, for me this measure here is more than enough.
Speakers 3 meters away.
Use a real mic and measure with REW. Or, use a real SPL meter.

Like waynel said, smartphone is unlikely to correctly measure 20 Hz.

Make sure you use C weighting to measure bass.
 

Kal Rubinson

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Keeping in the back of our minds and calculations, humans don’t hear low frequency equally in relation to the the full FR. Subs/bass needs to be from 6 to 8db higher to level match in our brain housing units.
But since this applies equally to the original/live sounds as well, the reproduction needs to be flat and not boosted. Of course, if you listen at lower levels, some compensation would be useful but, of course, at lower levels the demands on the sub are less. :)
 
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