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Re: [ST] db's and ears (was "Offroad exhaust" tune?)
- Subject: Re: [ST] db's and ears (was "Offroad exhaust" tune?)
- From: Dennis Griffin <eagleeye@xxxxxxxxx>
- Date: Thu, 9 Feb 2006 08:56:17 -0700
Knowing the sound level reduction in db can be somewhat misleading
without knowing what frequency range is being attenuated. Human voice
is typically considered to be in the 300-3,000 Hz range. The earplug
attenuation may attenuate more or less in that frequency range, yet
be rated at higher frequencies. Another factor at 65+ MPH is that the
ambient noise decibel level has increased considerably, especially
with a lesser quality or poorly fitting helmet, and your speakers
(and hearing) may not be able to compensate for that. If you are
serious about quality on-bike communications, you really need to
consider the Autocom systems (autocom.co.uk). I use a Pro 7 with
amateur radio transceivers for public service event support, like
bicycle races & rides, walks, marathons, etc., and I have been quite
pleased with it. Mostly doing this on my '04 Daytona 955i with stock
can and I can hear fine at 100 MPH +. Their systems aren't
inexpensive, but as the saying goes, you get what you pay for.
Dennis
Scottsdale, AZ
'00 RS
'04Daytona 955i
'99 & '06 KLR650
On Feb 9, 2006, at 7:44 AM, Bil Swartz wrote:
> On Thu, 9 Feb 2006, Sprint ST wrote:
>
>> For example, in communications there have been tests that show a 3db
>> increase in sound levels could not be detected by the human ear. It
>> took a 10db increase to be detected reliably. 3db is double the power
>> output and 10db is 10 times the power.
>
> Hey Rod,
>
> I'm hoping that the example you mention above means you know a bit
> about
> that subject as I've been debating what to do about bike comms to make
> things more usable.
>
> After going thru many prodcuts I've found Motocomm headsets and an
> FRS/GMRS radio make for a nice system for under $100/ea. We still
> have a
> hard time hearing when we're at speed though (65+) so was looking
> toward
> amplifying things. Tried the boostaroo and a small CMoy/MINT type amp
> that help a little but not quite enough.
>
> We usually wear earplugs, such as Leight (sp?) Laser-Lites. I
> tried an
> alternative plug one day, one of the firmer bell shaped numbers which
> seemed to let more sound through.
>
> So the question is, with the Laser-Lites claiming about a 33db
> reduction
> (I think it is), would a plug that claims a 23db reduction let more
> of the
> helmet speaker through and make a difference?
>
> Thanks for anythying you can tell me. I'm going to see if I can
> find a
> plug like the Laser-Lites in construct but with a lower db
> reduction to
> test with.
>
> --
>
> ._O_. '03 Sprint ST
> -Bil- /_\o/_\ '98 Thunderbird Sport /~\
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