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toby10
2008-09-20, 09:41
......or are higher bitrate radio stations not as loud on the Boom as are lower bitrate stations?

i.e. I seem to have to turn up the volume on the Boom much higher on 192k, 256k, and 320k feeds to get the same volume level output as on lower bitrate (128k, 96k) stations.

Maybe this is a design feature working with the Boom's DSP?

Anyone else notice this volume difference?

andyg
2008-09-20, 10:01
On Sep 20, 2008, at 12:41 PM, toby10 wrote:

>
> ......or are higher bitrate radio stations not as loud on the Boom as
> are lower bitrate stations?
>
> i.e. I seem to have to turn up the volume on the Boom much higher on
> 192k, 256k, and 320k feeds to get the same volume level output as on
> lower bitrate (128k, 96k) stations.
>
> Maybe this is a design feature working with the Boom's DSP?
>
> Anyone else notice this volume difference?

Do you get the hear the same volume differences on a computer or other
device? Most likely the stations are just applying their own gain.

toby10
2008-09-20, 10:24
On Sep 20, 2008, at 12:41 PM, toby10 wrote:

>
> ......or are higher bitrate radio stations not as loud on the Boom as
> are lower bitrate stations?
>
> i.e. I seem to have to turn up the volume on the Boom much higher on
> 192k, 256k, and 320k feeds to get the same volume level output as on
> lower bitrate (128k, 96k) stations.
>
> Maybe this is a design feature working with the Boom's DSP?
>
> Anyone else notice this volume difference?

Do you get the hear the same volume differences on a computer or other
device? Most likely the stations are just applying their own gain.

Hiya Andy. :)

I use both my SB3 and Boom exclusively for Internet Radio so I can't comment on volume differences between radio and library streaming.

My only point of reference is comparing the same stations with both my SB3 and Boom. As you say, each station will apply it's own level of gain, but it is MUCH more noticeable in the Boom. And seems consistently to be true (lower volume level) on higher bitrate stations. This is why I'm questioning the DSP in the Boom affecting volume (intentional or not) with such streams.

Don't get me wrong, I love my Boom regardless, it mostly becomes an issue when I'm playing a higher bitrate station, then select a different station which happens to be a much lower bitrate, then I'm *blasted* with a pretty high volume. :)

I try to remember to lower the volume when switching from a higher bitrate station, but I'm getting old and forgetful. :)

Thanks :)

andyg
2008-09-20, 10:48
On Sep 20, 2008, at 1:24 PM, toby10 wrote:

>
> andyg;342338 Wrote:
>> On Sep 20, 2008, at 12:41 PM, toby10 wrote:
>>
>>>
>>> ......or are higher bitrate radio stations not as loud on the Boom
>> as
>>> are lower bitrate stations?
>>>
>>> i.e. I seem to have to turn up the volume on the Boom much higher on
>>> 192k, 256k, and 320k feeds to get the same volume level output as on
>>> lower bitrate (128k, 96k) stations.
>>>
>>> Maybe this is a design feature working with the Boom's DSP?
>>>
>>> Anyone else notice this volume difference?
>>
>> Do you get the hear the same volume differences on a computer or
>> other
>>
>> device? Most likely the stations are just applying their own gain.
>
> Hiya Andy. :)
>
> I use both my SB3 and Boom exclusively for Internet Radio so I can't
> comment on volume differences between radio and library streaming.
>
> My only point of reference is comparing the same stations with both my
> SB3 and Boom. As you say, each station will apply it's own level of
> gain, but it is MUCH more noticeable in the Boom. And seems
> consistently to be true (lower volume level) on higher bitrate
> stations. This is why I'm questioning the DSP in the Boom affecting
> volume (intentional or not) with such streams.
>
> Don't get me wrong, I love my Boom regardless, it mostly becomes an
> issue when I'm playing a higher bitrate station, then select a
> different station which happens to be a much lower bitrate, then I'm
> *blasted* with a pretty high volume. :)
>
> I try to remember to lower the volume when switching from a higher
> bitrate station, but I'm getting old and forgetful. :)

Why don't you give some examples of streams which play at different
volumes on SB3 and Boom?

ccrome2
2008-09-20, 10:50
I can guarantee 100% that the DSP has nothing to do with this. Don't be
scared of DSP, it's a good thing when applied right.
The DSP doesn't know from bit-rates because it gets fully decoded PCM from
the system CPU.

toby10
2008-09-20, 13:35
I can guarantee 100% that the DSP has nothing to do with this. Don't be
scared of DSP, it's a good thing when applied right.
The DSP doesn't know from bit-rates because it gets fully decoded PCM from
the system CPU.

It may very well having nothing to do with the Boom DSP, was just a guess. As Andy has said it might just be the individual stations applied gain. I just don't seem to hear as much of a volume difference through my SB3 as I do my Boom when switching between the same streams. Maybe the boom is just more noticeable in volume differences.

Couple of example streams (as I relocate the streams that seemed considerably lower in volume with higher bitrates I'll add a couple more):

128k feed: http://91.121.0.85:80
96k feed: http://www.di.fm/mp3/trance.pls

320k feed: http://82.149.226.230:7110
256k feed: http://etn.luon.net:8100

Maybe it's just my ears, who knows. The Boom sounds incredible, volume differences real or perceived! :)

andyg
2008-09-20, 18:00
toby10 wrote:
> 128k feed: http://91.121.0.85:80
> 320k feed: http://82.149.226.230:7110

I sort of see what you mean but I think the 128k station is just louder
than the 320k station. If you have an SPL meter you could get an
objective reading comparing the difference in the stations on Boom vs.
your SB3.

toby10
2008-09-21, 06:03
toby10 wrote:
> 128k feed: http://91.121.0.85:80
> 320k feed: http://82.149.226.230:7110

I sort of see what you mean but I think the 128k station is just louder
than the 320k station. If you have an SPL meter you could get an
objective reading comparing the difference in the stations on Boom vs.
your SB3.

Thanks Andy. So I'm not going crazy? :)

As you stated, it's probably just simple stream gain differences. I only brought it up as it seemed a little too coincidental for two reasons:

- Lower output volume streams seemed to regularly be the higher bitrate streams
- Volume differences of these same streams on my Boom are (apparently) much more noticeable than on my SB3 via an AVR.