Help - My systems sound changes around 9.30pm

[Yorkshireman]

Hi

Wondered if anyone could help me, when im using my system i notice a distinct change in sound around 9.30pm, the sound gets fuller and deeper, (richer ?),
problem is it doesnt sound right, pre 9.30pm the sound is great nicely balanced and very enjoyable. When the change comes it has the effect of stopping me whanting to listen as its not right. It doesnt make any difference if ive been using it all day or just a few hours.

Only thing I can think of is the local heavy industry (steel works) shuts down at 9.30ish as they only run 2 shifts.

Question is how do i find out whats causing it ?.

thank you

[Bigman80]

Is 09:30 the time your kids go to bed ?

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[Yorkshireman]

Is 09:30 the time your kids go to bed ?

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Dont have any. :)

[Bigman80]

Lol, mine sounds better when the kids are in bed !!



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[Yorkshireman]

Lol, mine sounds better when the kids are in bed !!

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I dont have any distractions like that, just me (unless my niece and nephew come around), and I have a dedicated listening room.

[Bigman80]

Hmmm i didn't believe power supply had much of an impact on audio gear until i remove a surge protector from my rig. Less noise was the result. Maybe you need to look into that.

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[Macca]

Take the mains conditioner out and see if there is still an issue then.

[Yorkshireman]

Macca & Bigman80

Thanks I will give it a go, see what happens, thanks.

[Macca]

No probs, let us know how you get on.

[Jimbo]

Sounds different probably because the noise floor drops. Usually a system sounds better but I suppose it can go the other way.

[Lawrence001]

I would have said you may have tuned your system to some barely audible background noise from the works, but then I would expect it to sound too bright after, assuming the works produce LF rumbling type noise. Could it actually be producing some sort of ultrasonic noise over say 15khz? Tricky to think of something that could help, but what about trying some supertweeters and putting them on at 9.30?

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[Hammer]

I always find my system sounds better after 9. or therabouts pieces i,ve read seem to think its because there is less demand on the mains all round from heavy industy and normal household use

[Sherwood]

Sounds different probably because the noise floor drops. Usually a system sounds better but I suppose it can go the other way.

This is my experience. Even though I live in a detached house on a quiet road in a small village there is still a residual background hum during the day: even though it is barely noticeable. It is noticeable at night by it's absence. I suspect that there is also less noise on the mains after 9.30pm as by that time most people will have finished cooking, done their laundry and will not be out with the vacuum cleaner. I do not rule out the effects of perception though and the fact that we might be more amenable to music at the end of the day!

Geoff

[struth]

Probably a bit of both, plus sound travels better in cooler atmosphere so if room is cooler that will help too.

[Yorkshireman]

Hi all,

Its always between 9.30 and 9.35pm, ive had friends around and not mentioned it to them, and when it happens and the sound changes they have all asked whats happened. so i think i can rule out perception, room temp is also constant within a few degrees. Ive been busy this week but will be taking the isoket out of the system on saturday and giving it another go, and report back on whats happened.

thanks for all the comments and suggestions.

[struth]

Ive also seen equipment coming on song after being on and heated up. Of course this would require you to switch on at same time each day, and thus unlikely so would probably say its a factory switching off or something like that. Since we got a few bigger industrial units and an electric railway right beside me, my sounds went poor at quite a lot of times a week.( most tbh) i installed a filter box which helped and then a regenerator which solved it. Also having a steady 230v 50hz is desirable anyway

[Sherwood]

Hi all,

Its always between 9.30 and 9.35pm, ive had friends around and not mentioned it to them, and when it happens and the sound changes they have all asked whats happened. so i think i can rule out perception, room temp is also constant within a few degrees. Ive been busy this week but will be taking the isoket out of the system on saturday and giving it another go, and report back on whats happened.

thanks for all the comments and suggestions.

Do you have any appliances on a timer or are you adjacent to any premises operating heavy machinery?

[Yorkshireman]

Ive also seen equipment coming on song after being on and heated up. Of course this would require you to switch on at same time each day, and thus unlikely so would probably say its a factory switching off or something like that. Since we got a few bigger industrial units and an electric railway right beside me, my sounds went poor at quite a lot of times a week.( most tbh) i installed a filter box which helped and then a regenerator which solved it. Also having a steady 230v 50hz is desirable anyway

No switch on is very variable sometimes its been on 10 hours sometimes 2 or 3, We have a steel works (but no melting shop now) about a mile away but that has its own feed from the pylon due to load taken.


Do you have any appliances on a timer or are you adjacent to any premises operating heavy machinery?

No timers or anything like that.

[LC1979]

I'm no scientist, but my money would be on psychoacoustic effects rather than anything to do with electricity supply. If there is a LF rumble during the day from the industrial site then your brain will have become very effective at not noticing it. But it will inevitably be interfering with the LF of your music.

When the machinery stops you can suddenly perceive those frequencies in your system better and assume that something has changed in your system. It hasn't, the background and your perception has changed.

[struth]

Possible

[LC1979]

Possible

Admittedly, if it were this, you would expect it to be a fairly common experience for anyone listening to music in the area. Ask around?

[Lawrence001]

Assumes theres another audiophile close by, we're not that common in my experience!

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[Sherwood]

I'm no scientist, but my money would be on psychoacoustic effects rather than anything to do with electricity supply. If there is a LF rumble during the day from the industrial site then your brain will have become very effective at not noticing it. But it will inevitably be interfering with the LF of your music.

When the machinery stops you can suddenly perceive those frequencies in your system better and assume that something has changed in your system. It hasn't, the background and your perception has changed.

This would be my guess although the proximity of an industrial site suggests that might be a contributory factor (somehow).

[Yorkshireman]

im approx 1mile from the works, and in a semi rural area, I believe its the steel works sutting down at 9.30pm on its afternoon shift,
The works cannot be heard where i live, there is very little traffic on the road, and were quite away from the road. So i dont believe its background sounds at all.

[struth]

They may not use same machinery on night shift. A good filter is worth a try. See if you can borrow one.

[LC1979]

The works cannot be heard where i live, there is very little traffic on the road, and were quite away from the road. So i dont believe its background sounds at all.

That's because your brain has cancelled it out :)

[Yorkshireman]

They may not use same machinery on night shift. A good filter is worth a try. See if you can borrow one.

There is no night shift only morning and afternoons.

[Yorkshireman]

That's because your brain has cancelled it out :)

No noise at all very quiet area, all our windows are very recent triple glazed units (the ones to cut down on your heating bills) and the building is a very thick double stone wall.
The room i use for my music was soundproofed to stop me annoying people in the rest of the house.
So ambient noise isn't an issue, plus it very quiet outside loudest noise is birds and cattle.

[Yorkshireman]

They may not use same machinery on night shift. A good filter is worth a try. See if you can borrow one.

I will look into that, also going to try a re-generator too.

[Jimbo]

Still think it's a drop in noise floor due to less hash going on in the mains.

[Pharos]

Can't you tell the birds and cattle to shut up!

I would look at what current devices they use there; go and ask them, in a friendly way of course.

[Yorkshireman]

Can't you tell the birds and cattle to shut up!

The cows just look at me with a long face when I shout at them :)

[alphaGT]

What source are you listening to most? Are you streaming music from the internet? Listening to FM radio? Are there any nearby power lines overhead? It could be some sort of RF or EMF cutting through your area? Microwave towers? I had a neighbor with a large antenna behind his house, as big as his whole yard! He was a HAM radio operator, and I could hear his voice coming through my speakers! It spooked me, so I unplugged the amp, and could still hear his voice coming from the speakers! The windings in the speakers were picking up his radio waves. I assume. I realize this is not like your problem, but just shows how unseen things can affect your stereo.

If you are steaming it could be related to increased or decreased activities on your branch? But it really could be a hundred different things. But if I had to bet on one, it would be power from the wall.

I would definitely look into a good power filter or regenerator. But you may find you wind up with the post 9:30 sound. But it may stop it from changing, and you can adjust to suit. At what time does it change back? 6am? That could be very telling.

The talk of local low frequencies you are hearing all day can very well be there and you not know it. Take a SPL meter and be as quiet as possible during the day, and if you can get it below 45db then you live in a very quiet place! I can never get below 45db in my listening room during the day, but at night it can get down in the mid 30db's. I hear no real difference, but the meter don't lie.


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