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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: Fri, 10 Feb 2006 16:39:54 -0700
Sent this yesterday AM, but never saw it on the list server. ???
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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