Unequal speaker vibration - UK Vintage Radio Repair and Restoration Discussion Forum

clksteve · 22nd Nov 2018, 6:09 pm

At high volume anything placed on top of the left speaker (ie glass ashtray) will vibrate off and fall to floor. The same item placed on the right speaker will not move.
ItÂ’s not a problem ( I donÂ’t need an ashtray on top of the speaker! I donÂ’t smoke!) and I canÂ’t hear a difference in sound quality or volume left or right but was intrigued as to why this was happening. Assuming faulty speaker, amplifier or cables
I swapped the speakers over left for right. Still the ashtray only moves on the left speaker!
So I swapped the cables over left for right at the speaker end so the left channel played out of the right speaker (vice versa) and still only left speaker vibrates the ashtray off!
Tuner/phono/ aux all same issue.
Speakers on stands on concrete flloor and carpet.
Equal proximity to walls.

GoodmanÂ’s achromat 400 speakers
Pioneer SA 8500

clksteve · 22nd Nov 2018, 7:09 pm

Ok, it seems I underestimated the importance of speaker positioning relative to other items in the room. Moving the sofa further away from the left speaker made a huge difference to vibration. Lesson learned.

Trevor · 22nd Nov 2018, 8:57 pm

standing waves that's what it is standing waves

Radio Wrangler · 22nd Nov 2018, 9:55 pm

Has to be!

You've tried swapping over the L and R channels, so it isn't a case of listening to asymmetric music...

David

22nd Nov 2018, 6:09 pm	#1
clksteve Retired Dormant Member Join Date: Jan 2015 Location: Sutton-in-Ashfield, Nottinghamshire, UK. Posts: 40	Unequal speaker vibration At high volume anything placed on top of the left speaker (ie glass ashtray) will vibrate off and fall to floor. The same item placed on the right speaker will not move. ItÂ’s not a problem ( I donÂ’t need an ashtray on top of the speaker! I donÂ’t smoke!) and I canÂ’t hear a difference in sound quality or volume left or right but was intrigued as to why this was happening. Assuming faulty speaker, amplifier or cables I swapped the speakers over left for right. Still the ashtray only moves on the left speaker! So I swapped the cables over left for right at the speaker end so the left channel played out of the right speaker (vice versa) and still only left speaker vibrates the ashtray off! Tuner/phono/ aux all same issue. Speakers on stands on concrete flloor and carpet. Equal proximity to walls. GoodmanÂ’s achromat 400 speakers Pioneer SA 8500

22nd Nov 2018, 7:09 pm	#2
clksteve Retired Dormant Member Join Date: Jan 2015 Location: Sutton-in-Ashfield, Nottinghamshire, UK. Posts: 40	Re: Unequal speaker vibration Ok, it seems I underestimated the importance of speaker positioning relative to other items in the room. Moving the sofa further away from the left speaker made a huge difference to vibration. Lesson learned.

22nd Nov 2018, 8:57 pm	#3
Trevor Octode Join Date: Aug 2006 Location: Stoke-on-Trent, Staffordshire, UK. Posts: 1,082	Re: Unequal speaker vibration standing waves that's what it is standing waves

22nd Nov 2018, 9:55 pm	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,866	Re: Unequal speaker vibration Has to be! You've tried swapping over the L and R channels, so it isn't a case of listening to asymmetric music... David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done