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loud noise
An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing frequencies are said to have equal-loudness level measured in phons if they are perceived as equally loud by the average young person without significant hearing impairment.
The Fletcher–Munson curves are one of many sets of equal-loudness contours for the human ear, determined experimentally by Harvey Fletcher and Wilden A. Munson, and reported in a 1933 paper entitled "Loudness, its definition, measurement and calculation" in the Journal of the Acoustical Society of America. Fletcher–Munson curves have been superseded and incorporated into newer standards. The definitive curves are those defined in ISO 226 from the International Organization for Standardization, which are based on a review of modern determinations made in various countries.
Amplifiers often feature a "loudness" button, known technically as loudness compensation, that boosts low and high-frequency components of the sound. These are intended to offset the apparent loudness fall-off at those frequencies, especially at lower volume levels. Boosting these frequencies produces a flatter equal-loudness contour that appears to be louder even at low volume, preventing the perceived sound from being dominated by the mid-frequencies where the ear is most sensitive.
Recently over the past 2 months, the boiler or area by the water tank has started making a loud groaning noise whenever hot water has been running for much over a minute (sometimes less). Since the weather has gotten cooler, the radiators seem to come on (unless turned off at the TRV) whenever a...
Hello
I have no experience in this industry. A few years ago our home was completely stripped apart, remodelled and extended. This required new hot and cold water pipes all over the house, a larger boiler, larger tank and so on - see attached. We wanted the water tank to go into the loft but...
Hi all,
Had a toilet installed recently which is now making the attached sound. (No chance of him coming back to sort it...)
Anyone know what's causing it? Issue coming from whatever that piece is on the right hand side (please let me know).
Cheers
This is strange! I live in an apartment above a bar thats being used for "other purposes" and someone is consistently running the dishwasher but not to wash dishes. Ever since these people have started using the dishwasher consistently, every time I turn on my bathwater I am hearing a loud...
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Had a few guys to look at it already and they say it could be the gas valve but asked me to contact Biasi (who in the end refused to help). The engineers cleaned or flushed out some pipes but it still continued to make this horrific exploding sound upon ignition of the central heating (but not...
My Worcester cdi 30 conventional boiler makes this very loud noise frequently, sometimes vibrates the house:
Not sure what's causing it but I've been able to make it happen by having both heating and hot water on at the same time, then turning the room thermostat down so that just the HW is...
Hi I've not long trained in Gas and have come out to look at an ideal boiler. There is no noise when the boiler is on until the heating is put on and then there is evey now and then a loud vibrating humming noise. What could this be please? Thanks
Hi, I live in a 10 storey block of flats on the ground floor and inside some walls of my flat are rainwater pipes that run down from the roof. Couple of months ago I started hearing a loud bang in the walls where those RW pipes are hidden whenever it rains heavily. The building manager sent a...
Hi my boilers only a year old and 3 times now a strange loud noise keeps happening (I’ll attach video) . Heating and hot water working fine . If I turn it on and off it goes away but if I leave it it carries on for hours. ( I know this because I thought it must have been my neighbores one night...
Help my boiler is like a broken washing machine spinning at night. Have emptied condensate pipe under boiler nothing seems to work loud banging had to turn off at mains.
Hi I have been asked to quote to replace/repair an Istor. It makes a very very loud noise when it's running. It's hard to describe, it's a like a vibration.
I have a video that I can WhatsApp to someone if anyone can help, I'm unable to upload it to the site for someone.
The ex vessel needs...
Pump is running through Megaflow. Turn off the outlets and it is fine.
Find this on top of the cylinder, was this normal to put on top of cylinder? So the secondary return goes into the cold feed which taps into the top of this...
We recently moved to a rented property. Last Spring it was converted from oil to gas central heating. The property is a 1960'S chalet bungalow. The current boiler is made by Ideal and was new last Spring.
The heating works and heats the house very well, but the noise is unbearable. The bedroom...
Hello sorry if this message doesn’t go to the correct part of the site I’ve just joined and need help. Problem I’ve got is whenever I run any tap in my house there is a loud droning noise a bit like a ship. You hear the noise anywhere downstairs or upstairs but especiallyunderneath the kitchen...
Old boiler was replaced with Valiant 425. The customer is complaining- rightfully so, sometimes when the heating is on there is very loud noises from the radiator/pipes - that wasn't there before. I've been back and rebalanced the system, a few times - as it seems to keep loosing the...
Hi,
I live in a 3 story town house. We have a kitchen and a cloakroom downstairs and couple of toilets, bath on the 2nd and 3rd floors.
Since last few days we are experiencing a weird problem. Whenever we start the taps (either hot or cold or both) / flush the toilets on the 2nd / 3rd floors...
I have a Potterton Promax HE, and when I turn on just the hot water it is fine. However if I turn on the hot water and heating, after about 15-20 minutes it starts making a noise like it's going to bring the whole building down! I recorded a video...
Potterton Promax HE noise - Streamable
Any...
Hi,
I replaced a washer on the hot tap sink ( mixer), since then when you turn hot tap on it makes a loud rattling noise( it's LOUD) but you turn the tap a little bit more and noise stops.
Done a bit of internet searching, so I'll give this info if it helps . The boilers pressure gauge is right...
was at a friends house in Wiltshire the weekend,3story house toilet on each floor flushed the loo there middle floor and it made a very long loud noise.
Is that pressure too high on cold main as it fills cistern?
Thanks in advance
A few months back the expansion vessel from the mains water supply failed and I had the vessel and the pressure reducing valve replaced. As part of the replacement the expansion vessel was fitted with a copper tube instead of the flexible hose that was originally used.
Since the work was done...
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