Do you have the preset set for "Low Volume Music" - as that increases frequencies at low volumes and flattens out when driven harder.

Maybe setting that to flat to start with might help the appearance of bottom end when wound up. Personally, the B1 has never appealed to me with audiences of 200 - 300.

I run two L1 M2 with a B2 each and never have to drive the output more than 50% with the B2's normally set in mid position and I'm just a vocalist.

I cannot imagine running a disco on a single B1 with any success in a room with more than 100 in it - if that.

Original Post

Hi ScubaBadger,

ScubaBadger posted:

Do you have the preset set for "Low Volume Music" - as that increases frequencies at low volumes and flattens out when driven harder.

✄ - ✂ - ✄ - ✂ - ✄ - ✂ - ✄ - ✂ - ✄

You hear the bass flatten out as you raise the volume because human hearing is like that. I hear what you're describing, and it's not because the ToneMatch Presets change. It's because our perception of frequencies changes with volume.

For more information see: 

Fletcher Munson / Equal Loudness

fletcher munson curves

And, this is why there are two ToneMatch Presets for prerecorded music.

Category: DJ/Playback
Preset: Low Volume Music

Category: DJ/Playback
Preset: High Volume Music

This is why it's best to do a sound check at full gig volume.


Hi Uncle John,

If you are hearing  a tonal change as you, or someone else changes the volume of their speaking voice, you are probably hearing a mic characteristic.

Most all mics have some proximity effect. As a sound source gets closer to the mic it will result in an increased bass sound. A similar effect could take place as the volume of the sound source gets louder, or softer, moving or not. Slightly more bass for louder, less bass for softer.

The ToneMatch preset or the tone controls do not change as the volume of the sound source changes.


Hi, Uncle John.

Welcome to the Bose Portable PA Community.

Uncle John posted:

Does inbuilt ToneMatch for the voice channel on the L1 Compact automatically adjust bass when the talker raises and lowers the volume of their voice during a speech? 

That's a great question and the answer is "no". The ToneMatch Preset in the L1 Compact channel 1 does not automatically adjust in response to input volume.

Why do you ask?


PS - I just noticed that Oldghm already responded to you.

Two reasons:

1. I saw a presentation by Dr. Bose on this phenomenon (6.312 Lecture 25 — Psychoacoustics (cont.)). He states that boosting bass for voice was not a good idea since people are used to hearing people speak at different levels (and corresponding different filters). However talkers/singers raise and lower their voice for dramatic effect. I appreciate the advice given by Oldghm about microphones and microphone technique and thought that a little help from dynamic equalization could help too.
PS. I haven't seen pt1 of the presentation yet but I suspect it will add to what OLDghm is talking about. 

2. I'm trying to persuade the audio team at our church that a lectern speaker (ie. L1 Compact) could be a good addition to our existing PA System and improve localization of the talker. My strategy for doing this is take a line level voice signal from the church PA system and input it to channel 2 of the L1 Compact. Existing speakers would then be faded while listening to hear the difference this would make to talker localization.
I asked the question to better understand the implications of disregarding the ToneMatch feature for channel 1.

Hi Uncle John,

With the Bose Compact you have no option on channel 1 for the ToneMatch preset. It is always on. 

Trying to achieve localization is relatively easy if the person speaking remains in the same general area as the speaker system that is reproducing their vocal, but you have to be careful about how that person is miced. Lapel and head worn mics aren't necessarily so,  but can be problematic if moving about in front of an L1 system.

There are a lot of factors to consider before adding a new speaker to the mix, including, but not limited to the following.

Size of space and number of listeners.

How much does the speaking person move about.

Placement and dispersion pattern of the speakers currently in use.

How clean can you get the vocal sound with the current system. Clarity goes a long way in making listening easy on the ears of the audience.

Making space for an additional speaker system without intruding visually or affecting other movement or activities taking place in the same area.

It's an interesting idea to think and talk about.



ST posted:

Hi Uncle John,

Thank you THANK YOU for the link to the video. I'm enjoying it immensely!

If you have a link to part 1, please send it along.


I've searched for it but couldn't find it. I suspect that like the link I posted it's unlisted. Perhaps a Bose representative can help us?

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