32 posts / 0 new
Last post
atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
Bowers And Wilkins 683 Issue...

Hi, 

I have an Arcam A 19 to play my bowers and wilkins 683 through a chord carnival screen. I use a chameleon Rca Vee3 from my cyrus cd 6 se.

The issue is with some songs not all9 Say 4/10 songs as i take the volume over 50 on my arcam there is a noise from the speakers both chanels,

its a high frequency and comes from tweeter its not all the time but at a certain part of music, specaillt if there is a tight high frequency.

The B&W are 200 watts per speaker. Arcam is 50 watt per channel into 8 ohms and the issue starts if the volume is at 50 or more on my arcam which is about 50 percent. 

All the equipment is Brand new except the cdp. I dont think cdp can be a reason( not logical).

What could it be... I use bana plugs at back of the arcam. and cables are bare wire on speaker side. Speker side is defilnetly well tightened up. Bananas could be an issue. may not bre gripping all the strands thats all i acan think of.

Amp and speakers are more than minimum 100 hours run in already. 150 + by my calculation actually. i noticed the problem 3 days back. before that i never took the volume over a 50 on Arcam A 19. :poke: Its bothering me like this...

Help and Thanks in Advacne... Regulars and Regulators...

 

ID.'s picture
Offline
Last seen: 6 hours 42 min ago
Joined: 22/02/2010 - 13:12
Posts: 1422
RE: Bowers And Wilkins 683 Issue...

The 200w for the speakers is how much they can handle, not really an indication of what power the amp needs to have.

Most amps these days are hitting their max at about halfway, so I suspect the amp is clipping. You are trying to get more volume but hitting the maximim the amp can provide without distorition.

 

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

The amp itself goes upto 100 and i think it should not clip at 50 .

also the noise is not an amp clipping. The music keeps on playing but the tweeter on certain notes after that volume makes an additional cracking sot of a sound...

Ketan Bharadia's picture
Offline
Last seen: 1 week 3 hours ago
Joined: 07/06/2007 - 14:20
Posts: 226
RE: Bowers And Wilkins 683 Issue...

If it's only happening at high volumes I suspect it's the amplifier clipping. Other than that it's worth taking the amp back to the dealer/Arcam to get it checked.

ID.'s picture
Offline
Last seen: 6 hours 42 min ago
Joined: 22/02/2010 - 13:12
Posts: 1422
RE: Bowers And Wilkins 683 Issue...

Don't confuse clipping with overheating the amp. Overheating the amp by overdriving it would cause it to cut out, clipping wouldn't.

http://en.wikipedia.org/wiki/Clipping_(audio)

It seems to be a common design that max volume is around the halfway mark in modern amps. This is with high voltage sources (CD players, etc.). The amp has that extra play on the volume dial for sources like record players which start at a lower volume to begin with. Depending on the CD you might be able to to up to 2/3 or 3/4 or the way around before it starts clipping, provided they play at a low volume. Many of my older CDs are like this. Conversely, many modern discs mastered in this louder is better age will clip far sooner. The worse offenders might even be doing it before you hit half way.

chebby's picture
Offline
Last seen: 2 hours 1 min ago
Joined: 02/06/2008 - 09:40
Posts: 15876
RE: Bowers And Wilkins 683 Issue...

B&W's  683 specifications state the minimum impedance drops to 3 Ohms (nominal 8 Ohms).

That is quite a demanding load and I would suggest you need a much more powerful amp or much less demanding speakers (especially as you seem to enjoy playing music loud).

 

jiggyjoe's picture
Offline
Last seen: 3 days 18 hours ago
Joined: 21/08/2010 - 14:35
Posts: 240
RE: Bowers And Wilkins 683 Issue...

From sterephile review of the arcam   A19.  

Arcam's FMJ A19 shouldn't be used for driving loads much below 6 ohms at high levels, but that is a sensible compromise made to keep its price affordable. Other than that caveat, the A19's measured performance is excellent.

http://www.stereophile.com/content/arcam-fmj-a19-integrated-amplifier.

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

Thanks guys for you answers. So to get things straight.

1. Its does not clip as the amp keeps playing even at higer volumes even when the noise starts to come at around 50.

2. Its not heat either, i have tried it many times and some times the system isnt even switched on for 3 mins.

Yes the 683 go upto 3 ohm may be 2 but that sould allow it to clip. I agree this does not happen with all recordings.

Buy why a crackling sparkle from the tweeter both of them.

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

I think in both clipping and cutting off the sound should just stop.

Wherein in this case it keeps playing with mids and low frequecy perfectly deleiverd even after 50 51 52 53 54 55 56...

I am bugged...

andyjm's picture
Offline
Last seen: 1 hour 34 min ago
Joined: 20/07/2012 - 11:49
Posts: 713
RE: Bowers And Wilkins 683 Issue...

atishaysingh wrote:

I think in both clipping and cutting off the sound should just stop.

No, these are different.

Clipping occurs at high volumes when the amplifier is unable to drive sufficient power into the speakers to match the input signal. It can be caused by the output drivers hitting the supply rails, insufficient current carrying capability of the drivers, or inability of the drivers to slew the output voltage fast enough.  It introduces distortion, typically high frequency. It can lead to speakers overheating, potentially damaging the voicecoils.

 

chebby's picture
Offline
Last seen: 2 hours 1 min ago
Joined: 02/06/2008 - 09:40
Posts: 15876
RE: Bowers And Wilkins 683 Issue...

I think you are frying your tweeters with this abuse. You are pushing the amp ever louder each time and maintaining that if music keeps playing then the crackling cannot be due to clipping.

(Given that these speakers have a sensitivity of 90dB, I can't imagine what it's doing to your ears let alone your system!)

 

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

Thanks that seems understandable... because the sound is crackling and feels as if a a tiny metal ball is vigiorusly smashing agaist twweter walls on both speakers.

Any more light on this particular point guys ID what are your thoughts... 

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

So what do you suggest not playing it that loud where it gets edgy... more light on this please...

BigH's picture
Offline
Last seen: 1 hour 4 min ago
Joined: 29/12/2012 - 12:31
Posts: 3530
RE: Bowers And Wilkins 683 Issue...

Yes either turn the volume down or buy a more powerful amp. maybe the RK K2 would be a better choice, otherwise your speakers will get damaged.

atishaysingh's picture
Offline
Last seen: 1 week 4 days ago
Joined: 17/09/2013 - 18:31
Posts: 66
RE: Bowers And Wilkins 683 Issue...

Ironical... A low poer amp can damage the speakers at high volumes... wherein the speakers can handle a higher pwer amp an can also go much louder... i would hate if thats the case...

BigH's picture
Offline
Last seen: 1 hour 4 min ago
Joined: 29/12/2012 - 12:31
Posts: 3530
RE: Bowers And Wilkins 683 Issue...

atishaysingh wrote:

Ironical... A low poer amp can damage the speakers at high volumes... wherein the speakers can handle a higher pwer amp an can also go much louder... i would hate if thats the case...

 

Yes of course, its distortion rather than power that does the damage.

Pages

Log in or register to post comments