KEF subwoofer won't play below 30Hz without popping - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 15 Old 06-16-2016, 08:28 PM - Thread Starter
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Question KEF subwoofer won't play below 30Hz without popping

Hey guys I've been having trouble with my KEF sub. I purchased this home theater system, Denon AV receiver, tower speakers etc.... during a scene of a horror movie while there was low bass the sub started making a crackling/popping sound. I contacted the store and they told me to bring the subwoofer into the store, I did and we ended up replacing the sub, when my wife and I were watching another movie the sub did the same thing, so I contacted the store again and they advise me that it might be the sub cable, so I exchanged the cable and no change, the subwoofer is still making that sound. So.... I contacted the store again and they told me that the speaker system needs to break in before it will stop making that sound. I have been playing music when I leave for work to break it in, when I arrived home from work today I tried testing the sub and sure as crap it started doing it again. Anything lower than 30hz causes the sub to make that sound no matter what the level is at. I have adjusted my speakers to, Left, Center and right @ 80hz rear @ 100 Hz. I have tried to raise and lower the sub crossover, it seems like I've tried it all....

Does the sub need to break in more?
what is going on?
HELP!
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post #2 of 15 Old 06-17-2016, 06:17 AM
 
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What model sub is it? Not all subs are capable of going below 30Hz. Popping can indicate that the driver is reaching its excursion limit or that the amp is clipping.
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post #3 of 15 Old 06-17-2016, 10:13 AM
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If it is indeed making that popping sound at any volume level, there is something wrong somewhere in the chain.

What source(s) are you using to test this?
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post #4 of 15 Old 06-17-2016, 05:39 PM - Thread Starter
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Quote:
Originally Posted by Bill Fitzmaurice View Post
What model sub is it? Not all subs are capable of going below 30Hz. Popping can indicate that the driver is reaching its excursion limit or that the amp is clipping.
Hey my set up is,

AVR: Denon AVR-X3200W

Sub : KEF Q400b (Set to 80Hz LFE+Main)

Tower: Soundstage STAGE 3D5 (Set to 60 Hz)

Center: KEF Q600c (Set to 60 Hz)

Rear: Soundstage STAGE 3D2 (Set to 100 Hz)

If the volume is low it can play 30-20hz range but because the volume is low it you can barely notice it, rendering it useless.

....

Ugh this is dumb....
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post #5 of 15 Old 06-17-2016, 05:47 PM
 
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Sounds like the store has no idea what they're doing, first of all. That sub specs say it's frequency response is 28-140hz +/- 3dB and since its sealed it really shouldn't have problems that you're describing. How did you set the sub up with the avr? Audyssey? What's the level setting? Why are you using LFE+Main? I'd change that to LFE first of all. You do know that you don't need to have the same brand of sub? KEF isn't exactly well known for subs....
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post #6 of 15 Old 06-17-2016, 07:21 PM - Thread Starter
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Originally Posted by lovinthehd View Post
Sounds like the store has no idea what they're doing, first of all. That sub specs say it's frequency response is 28-140hz +/- 3dB and since its sealed it really shouldn't have problems that you're describing. How did you set the sub up with the avr? Audyssey? What's the level setting? Why are you using LFE+Main? I'd change that to LFE first of all. You do know that you don't need to have the same brand of sub? KEF isn't exactly well known for subs....
Hey,

I dont know much about this stuff.

I tried to set the system up with audyssey but found that it under rated my system so i chose to do it manually.

I use LFE+main because i find there is way more sound through my system, when I use LFE my system sounds dull. REF link below.

youtube.com/watch?v=j_X9QwWUMSE

I have found the KEF sub to be great so far except for this issue

imgur .com

/a/CzperSYSTEM

I have attached some photos, let me know if you guys need more info
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post #7 of 15 Old 06-17-2016, 07:31 PM - Thread Starter
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Originally Posted by Zendorian View Post
Hey,

I dont know much about this stuff.

I tried to set the system up with audyssey but found that it under rated my system so i chose to do it manually.

I use LFE+main because i find there is way more sound through my system, when I use LFE my system sounds dull. REF link below.

youtube.com/watch?v=j_X9QwWUMSE

I have found the KEF sub to be great so far except for this issue

imgur .com

/a/CzperSYSTEM

I have attached some photos, let me know if you guys need more info
sorry wont let me post link until i have 5 posts...
http
//imgur.com/a/Czper
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post #8 of 15 Old 06-17-2016, 07:33 PM - Thread Starter
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i11
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post #9 of 15 Old 06-17-2016, 07:34 PM - Thread Starter
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Here is my sound system

http://imgur.com/a/Czper
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post #10 of 15 Old 06-17-2016, 08:05 PM
 
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Quote:
Originally Posted by Zendorian View Post
Here is my sound system

http://imgur.com/a/Czper
I see a photo of a back of a sub. Why the 6dB setting? Have you tried that to 0dB? Your gain/volume setting may be too high;what is the level of the subwoofer as shown for speaker levels in your avr after running Audyssey?

ps Main + LFE exaggerates bass response the way you have it setup. I'd rather use Audyssey DynamicEQ to adjust for bass. Do you have Dynamic Volume on?
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post #11 of 15 Old 06-17-2016, 08:30 PM
 
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I double checked on what LFE+Main does with Denon (even though I have one); it seems it's more about when setting speakers to large rather than what I was remembering http://denon.custhelp.com/app/answer.../~/lfe---modes

Sorry about that, chief. I'd still just use the LFE setting....
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post #12 of 15 Old 06-17-2016, 08:50 PM
 
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Quote:
Originally Posted by Zendorian View Post
Sub : KEF Q400b (Set to 80Hz LFE+Main)
A ten inch sub isn't going to be a powerhouse below 30Hz. That doesn't mean that it might not work better with some system adjustment, but it will have its limitations.
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post #13 of 15 Old 06-17-2016, 08:52 PM
 
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Just what size room is this in by the way?
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post #14 of 15 Old 06-18-2016, 03:26 AM
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I had similar issues after initial set-up. Try setting on the to 0db, volume at 10 o'clock and re-run audyssey. Then on the receiver set to LFE as lovinthehd suggested. You can adjust the level +3 db [more or less] to your preference in the AVR menu. This did solve the issue for me anyway. It took alot of trial and error before I figured it out. same with crossover adjustments. I Wish I had found this very helpful and educational forum beforehand.

Kef LS50,Q200C, Q100, SVS SB-2000, Denon AVR-X3400H, NAD 216, Panasonic 50" Plasma, Xbox One.
Bedroom: Kef Q100 ,JBL Loft 20, Bic F-12, Denon AVR-S710W, PS3, 32" Insigna LED.

Last edited by pase22; 06-18-2016 at 03:30 AM.
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post #15 of 15 Old 08-24-2016, 09:40 PM - Thread Starter
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Got rid of this sub, went with POLK 12 inch and its amazing... the KEF sub could only handle max 27hz on paper which i could not reach that without clipping... moral of the story, this sub is junk, STAY AWAY ... I don't know where they get off charging such high price for it...

Thanks for your guys help
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