Knowledge
What are filters and how do they affect the sound of your audio system?
If you own a stereo it will undoubtedly have filters, but do you know what they are?
- High-pass filter – lets frequencies above a cutoff point through and attentuates frequencies below the cutoff
- Low-pass filter – lets frequencies below a cutoff point through and attentuates frequencies above the cutoff
- Bandpass – lets frequencies between two cutoff points through, and attenuates other frequencies
- Filters can be active or passive – passive are cheaper, and usually contained within speakers
- Filters have limitations – they can’t reject frequencies outside the cutoff point immediately
- Filters can be used to remove rumble or hiss.
A HPF, LPF (and BPF) used together creates an audio crossover
For the full detail on audio filters, including diagrams to make it all more clear, click here
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How loud can you be with your stereo?
People are entitled to make noise at ‘reasonable level’ according to the council. Typical complaints are loud music at parties, house and building alarms, construction, buskers and bars.
You can be fined for ‘excessive’ or ‘unreasonable’ noise, depending on the time of day, background noise and duration.
There’s no specific decibel (dB) level that’s considered to be exceeding the noise limit – it’s subjective. Consider that if a noise control officer turns up at your place, someone else thinks your noise is unreasonable.
What’s not covered in the noise control act?
- Barking dogs
- Noisy vehicles
- Noise in the workplace
- Noise between tenants with the same landlord
For more information, see your local council website
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Cheap and no-cost tips – you don’t have to spend a fortune to get the best out of your technology; cool stuff to make your home smarter; audio art cafe; Nintendo DSI, 69 products reviewed (including Theophony M3b stand-mounted speakers, Quantum QX2 and QX4 mains purifiers, Paradigm Cinema Phantam floorstanding speakers, Naim Nat XS integrated amp, Polk speakers and Onkyo amp, Digital Designs speakers, Cambridge One DX1 Music centre, Logitech Ultimate Ears earphones, Audiolab multichannel power amp and home theatre processor, Epson EH-TW3000 home theatre projector, Rotel RMB-1565 power amp, and more from Sony, Mirage, Samsung, Cowon and JVC), plus the usual columns.
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