Browse Forums Safer Living 1 Jul 31, 2009 1:10 pm we are looking to install a hydrotherapy spa requiring two 1HP onga pumps. Each pump has a noice level of 64 dB. If there are two runging side by side what will the noise level be and would a Hebel block casing be effective at cutting the sound??? My builder is planning to place the pump access in the adjoining room's robe wihich will also be a room for my DD ... will it hinder her sleep at all?? progress viewtopic.php?f=31&t=20401 sculptures viewtopic.php?f=36&t=26607 pole trouble viewtopic.php?f=3&t=25988 Re: Acoustic experts - help needed please 3Jul 31, 2009 6:25 pm Casa2 64 dB + 64 dB = 67 dB (it's alogarithmic scale) AHH - should have paid more attention in those physics classes!!! Thank you!!!! so is that just around the noise of a fridge / dishwasher??? Will hebel blocks in a wardrobe be effective enough to let someone sleep in the same room?? progress viewtopic.php?f=31&t=20401 sculptures viewtopic.php?f=36&t=26607 pole trouble viewtopic.php?f=3&t=25988 Re: Acoustic experts - help needed please 5Aug 17, 2009 11:28 pm seeking solutions Will hebel blocks in a wardrobe be effective enough to let someone sleep in the same room?? I think you'll find Hebel Soundbarrier is more effective than masonry or concrete, but less effective than many types of acoustic foam batts -- a cheaper, easier and more effective solution in most cases. Re: Acoustic experts - help needed please 6Aug 21, 2009 9:19 am Foam is good at reducing sound reflection, but not particularly good for reducing sound transmission. Foam is particularly useless in reducing the transmission of low frequency sound. From your description, you are trying to reduce the sound transmitted through the blocks. The rule of thumb is that the denser the material, the less sound will be transmitted. If you find that the noise is a problem, then you could try lining the blocks with lead. Lead works well because it is very dense; it is also easy to cut and to shape. Pfiff Finally making progress again, with a clothesline (yippee) and some much needed little things being attended to over the holidays. 40 C on New Year's eve? We love our a/c! Re: Acoustic experts - help needed please 7Aug 21, 2009 1:09 pm Fiffaro Foam is good at reducing sound reflection, but not particularly good for reducing sound transmission. Foam is particularly useless in reducing the transmission of low frequency sound. From your description, you are trying to reduce the sound transmitted through the blocks. The rule of thumb is that the denser the material, the less sound will be transmitted. If you find that the noise is a problem, then you could try lining the blocks with lead. Lead works well because it is very dense; it is also easy to cut and to shape. Lead? This sounds like a lot of work. We will try to place the pumps on the other side of the spa with access from a toilet next door. This might work too. Thanks Fiffaro for your idea. I still have a ton of other acoustic related issues to sort out - between floors, rooms, external .... We originally had costed rockwool between levels but now my builder is concerned about the allergenic aspect of the product. progress viewtopic.php?f=31&t=20401 sculptures viewtopic.php?f=36&t=26607 pole trouble viewtopic.php?f=3&t=25988 Re: Acoustic experts - help needed please 8Aug 21, 2009 1:18 pm Casa2 Apparently 67 dB is roughly the same noise level as normal conversation. Hmmm... 67dB would be enough to disturb my sleep. That's louder than a reverse cycle Air Con outdoor unit. Certainly louder than your average decent dishwasher these days. Would the pumps be on constantly or do they cut in and out ? Re: Acoustic experts - help needed please 9Aug 21, 2009 1:23 pm seeking solutions Fiffaro Foam is good at reducing sound reflection, but not particularly good for reducing sound transmission. Foam is particularly useless in reducing the transmission of low frequency sound. From your description, you are trying to reduce the sound transmitted through the blocks. The rule of thumb is that the denser the material, the less sound will be transmitted. If you find that the noise is a problem, then you could try lining the blocks with lead. Lead works well because it is very dense; it is also easy to cut and to shape. Lead? This sounds like a lot of work. We will try to place the pumps on the other side of the spa with access from a toilet next door. This might work too. Thanks Fiffaro for your idea. I still have a ton of other acoustic related issues to sort out - between floors, rooms, external .... We originally had costed rockwool between levels but now my builder is concerned about the allergenic aspect of the product. I reckon a dense and thick rubber might be a good option. Easy to cut and work with and readily available in different grades/densities from a "rubber" supplier. Not cheap though, but probably cheaper than accoustic foam and would be more effective in terms of deadening the sound waves from the pumps. Thoughts ? I know our dishwasher is encased in a black rubber (a single piece wrapped over the top and sides) to help absorb sound more effectively - it seems to work well enough. But I can't make a direct comparison with and without the rubber in place. I totally agree with everything you have written. Thanks again for your always excellent input and advice. I really enjoy reading your posts cheers Simeon 1 3280 Thank you alexp79 and gommeqld for your advice, that's very helpful, thanks 3 7945 Thankyou so much 😀 I've decided on White on white for doors and trims, White on white 50% on ceiling and Mt buller for walls. Fingers crossed it will look OK 😀 2 7171 |