hissing sound coming from behind woofer on one side AR11
in [Repair]
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From: Michael A. Terrell on 2 Aug 2010 09:03 Jamie wrote: > > Amanda Ripanykhazov wrote: > > > On Jul 30, 5:41 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: > > > >>On Fri, 30 Jul 2010 14:03:39 -0700, Amanda Ripanykhazov wrote: > >> > >>>Thank you for your confidence everyone: If I wanted to wind everyone up, > >>>dont you think I would have found a funnier way of doing it than this? > >> > >>Not if you're just not too funny in the first place. > >> > >> > >>>If someone can get me a way of posting a wav file to a NG, let me know > >>>and I will stick a microphone in front of the speaker and post whatever > >>>it records > >> > >>>Meanwhile I will take the speaker out and report back if/when I have a > >>>result > >> > >>But you've already subbed the speaker and the hiss went away or so I > >>thought I had previously read. > > > > > > Call me an old cynic and obviously I am not a technical expert but > > doesnt simple logic mandate that when you sub a speaker and the sound > > goes away, all it means is that (what I thought blindingly obvious > > from the symptoms and there being no apparent logical connection > > between the source and the hissing, which was why I posted here: > > Because "The problem is that you are describing something that doesn't > > seem to make any sense, or have any obvious explanation" so I wondered > > whether anyone had come across it before) the sound wasnt coming from > > the source? Or did I have to add that when i put the speaker back > > again, the sound came back? > check for electrical devices adjacent to the speaker, inside and outside > of the wall. Your speaker coil maybe in the path of an induced magnetic > field from a device near by.. > > etc.. You think she has a MRI machine in her wall? The voice coil isn't going to be affected by nearby magnetic fields, due to the narrow gap and shielding.
From: GregS on 2 Aug 2010 10:05 In article <cc42fb59-8483-4e9e-ba6b-a1c0a4e999e4(a)q35g2000yqn.googlegroups.com>, Amanda Ripanykhazov <dmanzaluni(a)googlemail.com> wrote: >Thank you for your confidence everyone: If I wanted to wind everyone >up, dont you think I would have found a funnier way of doing it than >this? > >If someone can get me a way of posting a wav file to a NG, let me know >and I will stick a microphone in front of the speaker and post >whatever it records I thought it was from BEHIND the speaker. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! >Meanwhile I will take the speaker out and report back if/when I have a >result
From: Chuck on 2 Aug 2010 10:21 On Tue, 20 Jul 2010 12:30:48 -0700 (PDT), Amanda Ripanykhazov <dmanzaluni(a)googlemail.com> wrote: >Anyone know what this means? This hissing sound isnt constant, it is >irregular: It isnt related to the music or any movement of the cone >or any signal put through it, though it doesnt happen when no sound is >put through the speaker. > >Frankly it sounds more mechancial than electronic (as if there is >something behind there!) but as I say, it isnt related to whatever is >coming through the speaker though it does increase and decrease with >adjustment of the volume control. Andit is louder than most signals >put through the woofer itself?? > >Is it indicative of some pot in the crossover needing cleaning or is >there something else going on please? (I have seen reference to people >improving the sound of AR11s by bypassing the tone controls in the >speaker completely). This speaker is quite elderly and I would >imagine that if it does use mechanical pots, they must be fairly dirty >by now I once lived in an old mansion that had been converted into an apartment building where one of my KLH 32 speakers was mounted by the main electrical entrance for the building. There sometimes was a soft noise from the tweeter without the amplifier being on. Later on we discovered that the owner of the building had replaced one of the cartridge fuses in series with the hot 120 AC in with a piece of copper pipe that was arcing at the fuse clips. I know this sounds apocryphal but I spent 32 years in the consumer audio field as a technician, and service and store manager so you can be reasonably sure, in this case, that I'm not a troll . Chuck
From: William Sommerwerck on 2 Aug 2010 10:28 > I once lived in an old mansion that had been converted into an > apartment building where one of my KLH 32 speakers was mounted > by the main electrical entrance for the building. There was sometimes > a soft noise from the tweeter without the amplifier being on. Later on > we discovered that the owner of the building had replaced one of > the cartridge fuses in series with the hot 120 AC in with a piece of > copper pipe that was arcing at the fuse clips. What do you think formed the "return path" that allowed current to flow through the speaker? For example... In the simplest possible 2-way system, with only a capacitor in series with the tweeter, * there would be no complete circuit for the current to flow through the tweeter, unless the unpowered amplifier had a sufficiently low output impedance. * The woofer can be designed to mechanically roll off at the crossover frequency, so no inductor is needed.
From: nesesu on 2 Aug 2010 11:19
On Aug 2, 7:28 am, "William Sommerwerck" <grizzledgee...(a)comcast.net> wrote: > > I once lived in an old mansion that had been converted into an > > apartment building where one of my KLH 32 speakers was mounted > > by the main electrical entrance for the building. There was sometimes > > a soft noise from the tweeter without the amplifier being on. Later on > > we discovered that the owner of the building had replaced one of > > the cartridge fuses in series with the hot 120 AC in with a piece of > > copper pipe that was arcing at the fuse clips. > > What do you think formed the "return path" that allowed current to flow > through the speaker? > > For example... In the simplest possible 2-way system, with only a capacitor > in series with the tweeter, * there would be no complete circuit for the > current to flow through the tweeter, unless the unpowered amplifier had a > sufficiently low output impedance. > > * The woofer can be designed to mechanically roll off at the crossover > frequency, so no inductor is needed. The tweeter, capacitor and woofer are all effectively in series as a loop in the speaker box, and that loop is large enough to pick up the high M field spectrum of the arcing 60Hz so close by. Some of that generated arc noise will fall in the band that the tweeter will reproduce efficiently. Neil S. |