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SPL - What's this mean for my hearing?

| 0 comments | Wednesday, March 31, 2010
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Sounds less than 75 dB have no significant effect on our hearing.

Exposure to sounds above 85 dB causes short term hearing losses called temporary threshold shifts. If this occurs, your ear becomes less sensitive, and sounds seem quieter than normal. After some time, normal hearing returns.

Repeated exposure to sounds that cause temporary threshold shifts results in permanent damage to the ear in the form of a permanent threshold shift . The ear loses sensitivity in the frequencies 3,000 Hz through 6,000 Hz, resulting in a "notch" in the hearing range. Time of exposure is important, the louder the sound, the less exposure time before permanent damage sets in.

According to OSHA, the exposure time limits are: (these are A-weighted, most home theater measurements are made with C weighting, which typically gives higer readings for broad spectrum measurements).

If you like to crank it on up during the "good parts" to really feel the action. Look at your results from the Peak SPL Calculator compared with the OSHA guidelines. Most moderate HT systems are capable of 102 to 107 dB peaks at a decent (10+ feet) listening position, at these peak levels the normal dialog is going to be at least 85-90dB, within the range where permanent hearing loss can occur.


SPL - How Loud is That?

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Most home theater speakers and ampliers, even modest ones, are quite capable of producing sound pressure levels in excess of 100 dB. So how loud is that? For some analogies, check out this table:

Feedback Destroyer DSP 1100P

| 0 comments | Tuesday, March 30, 2010
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*20-bit A/D and D/A converters with 64/128 times oversampling for ultra-high headroom and resolution
*Automatically and “intelligently” searches out and destroys up to 12 frequencies per channel
*24 fully programmable Parametric Filters that can be set manually or via MIDI
*Set-and-forget* default setting enables immediate and super-easy Feedback Destroyer performance
*Single-Shot mode automatically searches and destroys feedback and locks the filter until you reset them manually
*Auto mode continuously monitors the mix, resetting programmed filters automatically
*Manual mode allows for setting up to 2 x 12 fully parametric filters including Frequency, Bandwidth and Gain
*Single-Shot, Auto and Manual modes are assignable for each filter
*Free FEEDBACK DESTROYER software allows for total remote control via PC (download at
www.behringer.de)
*Two software engines give you independent or coupled functions on left and right channels
*Internal 24-bit processing with professional 46 kHz sampling rate
*Servo-balanced Inputs and Outputs on gold-plated XLR and TRS Jack connectors for high signal integrity
*Full MIDI capability and user preset memories to store programs for instant recall
*Accurate eight-segment LED level meters simplify level setting for optimum performance
*Future-proof* software-upgradeable architecture
*High-quality components and exceptionally rugged construction ensures long life and durability
*Internal power supply design for professional applications
*Manufactured under the ISO9000 management system

Feedback Destroyer PRO FBQ2496

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*Ultra-Fast 24-Bit/96 kHz Feedback Suppressor/Parametric EQ
*Automatically and "intelligently" locates and destroys up to 20 frequencies per channel
*Ultra-fast feedback detection (>0.2 sec) due to patented* FFT signal analysis
*Ultra-narrow notch-filters (up to 1/60th octave) for very effective feedback suppression, while keeping highest sonic quality
"Set-and-forget" default setting plus Panic button enable immediate and super-easy Feedback Destroyer performance
*Auto mode continuously monitors the mix, resetting programmed filters automatically
*Single-shot mode automatically detects and destroys feedback and locks the filter until you reset it manually
*Manual mode allows individual setting of up to 40 fully parametric filters with frequency, bandwidth and gain adjustment
*Ultra-high resolution 24-bit/96 kHz A/D and D/A converter powered by a 32-bit DSP for ultimate audio performance
*Open MIDI architecture for future software updates and flexible communication with digital equipment
*Balanced inputs and servo-balanced outputs with gold-plated XLR and ¼'' TRS connectors
*Internal switch-mode power supply for maximum flexibility (100 - 240 V~), noise-free audio,
*superior transient response plus lowest possible power consumption for energy savings
*High-quality components and exceptionally rugged construction ensure long life
*Conceived and designed by BEHRINGER Germany


 

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