[PD] Speaker protection abstraction

[Luigi]

Am 01.12.2008 um 15:21 schrieb Andy Farnell:

>
>
> It's quite rare to find a sound card and amplification system
> that can actually deliver DC. These are usually specialised
> DACs for control applications. Regular audio equipment uses
> DC blocking capacitors (analogue high-pass) that won't admit
> anything much below 5-10Hz.
>
> All the same, if you are using an experimental signal processing
> system like Pd or any other computer music language along with
> high power amplification for a live audience, it is sensible
> to add a compressor/limiter at the end of the chain. For the
> sake of your audience rather than the speakers.
>
> This should be a separate piece of hardware, not part of
> the software system that could fail.
>

Hi, yes thats my experienc, too. I tried to use limiter~, but wasnt  
satisfied.

it created some crackles with extreme signals, like pure sine-tones
i would recommend a hardware solution as well.


>
> On Mon, 1 Dec 2008 08:50:41 -0500
> "Spencer Russell" <spencer.f.russell at gmail.com> wrote:
>
>> Most of my live performance work involves realtime processing of
>> upright bass, and I find myself often using a lot of very short
>> variable IIR taps (delays with feedback).
>>
>> I use either my 500-watt bass amp or the house PA as output.
>>
>> Right now I don't have any explicit patchage to make sure I'm not
>> pumping out any signal that's straining the amplification system, and
>> if I watch my speakers as I play I often see them popping in and out
>> in a distressing fashion.
>>
>> I'm thinking I should start including some basic speaker protection
>> into the output stage of my patches, mostly a limiter and highpass
>> filter to get rid of any sub-audio and DC signal.
>>
>> Is this necessary? I assume that either the output of the firebox or
>> the input of my amplification setup is AC-coupled and should be
>> getting rid of DC anyways, but we all know what happens when you
>> assume.
>>
>> Are other people using speaker protection patches? Anything more
>> sophisticated than the classic [hip~ 5] before the output?
>>
>> -spencer
>>
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>
> -- 
> Use the source
>
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