Electronic Bass Trap

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Bag End is supposedly coming out with something called the E-Trap which is
an electronic bass trap. I've never heard of this. Has anyone else or anyone
had any experience with them? It sounds intriguing and great if it works.

--
Thanks,
Ricky W. Hunt
freendeed

 

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In article <TLxod.72785$V41.31167@attbi_s52>,
Ricky W. Hunt <rhunt22@hotmail.com> wrote:
>Bag End is supposedly coming out with something called the E-Trap which is
>an electronic bass trap. I've never heard of this. Has anyone else or anyone
>had any experience with them? It sounds intriguing and great if it works.

I have seen their AES paper on the subject, which is available from the
AES as preprint #6277. It looks like an interesting idea. It looks like
it will probably be more expensive than an equally effective passive bass
trap, but probably more compact as well. In a small room that could be
a real plus. In a big room it is less likely to be.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

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In article <cnucb1$ese$1@panix2.panix.com> kludge@panix.com writes:

> >Bag End is supposedly coming out with something called the E-Trap

> I have seen their AES paper on the subject, which is available from the
> AES as preprint #6277. It looks like an interesting idea. It looks like
> it will probably be more expensive than an equally effective passive bass
> trap, but probably more compact as well.

Is is something like noise cancelling headphones, only for low
frequencies?

Ken Kantor's company after NHT Pro (before his present one) had an
instantantaneously steerable subwoofer that would change its radiation
pattern based on frequency to aim the sound toward palces where
reflections wouldn't be a problem. I thought that was pretty cool.

--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

 

[Guest]

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In article <znr1101212733k@trad>, Mike Rivers <mrivers@d-and-d.com> wrote:
>In article <cnucb1$ese$1@panix2.panix.com> kludge@panix.com writes:
>
>> >Bag End is supposedly coming out with something called the E-Trap
>
>> I have seen their AES paper on the subject, which is available from the
>> AES as preprint #6277. It looks like an interesting idea. It looks like
>> it will probably be more expensive than an equally effective passive bass
>> trap, but probably more compact as well.
>
>Is is something like noise cancelling headphones, only for low
>frequencies?

Hmm... yeah, I guess so. I never thought about it like that.

>Ken Kantor's company after NHT Pro (before his present one) had an
>instantantaneously steerable subwoofer that would change its radiation
>pattern based on frequency to aim the sound toward palces where
>reflections wouldn't be a problem. I thought that was pretty cool.

How many individual drivers did it have? I have often stacked two or three
subwoofers into a line array to get directionality and then moved them
around to get the room peaks and troughs evened out as much as possible,
when doing PA work. But it would seem to get truly accurate directional
control, you'd need a whole lot of drivers. Or (heaven forbid) a bass horn.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

[mark]

Archived from groups: rec.audio.pro (More info?)

Goggle ACTIVE BASS TRAP

I thought of this about a year ago as a cool new idea to get rich,
unfortunatlry someone else thought of it before me.

Mark

 

[Guest]

Archived from groups: rec.audio.pro (More info?)

In article <cnvkhv$aco$1@panix2.panix.com> kludge@panix.com writes:

> >Ken Kantor's company after NHT Pro (before his present one) had an
> >instantantaneously steerable subwoofer

> How many individual drivers did it have?

I can't recall for sure but my impression is that it had two
back-to-back and maybe a third one. Kind of worked like an MS
microphone in reverse (or an ILS). Lotsa DSP


--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

 

[Guest]

Archived from groups: rec.audio.pro (More info?)

> But it would seem to get truly accurate directional
>control, you'd need a whole lot of drivers. Or (heaven forbid) a bass horn.

The new SPL BDeap subs get an amazing amount of direction control with just
2..with 4 it's very impressive..with no processing.


John A. Chiara
SOS Recording Studio
Live Sound Inc.
Albany, NY
www.sosrecording.net
518-449-1637

 

[Guest]

Archived from groups: rec.audio.pro (More info?)

In article <znr1101230282k@trad>, Mike Rivers <mrivers@d-and-d.com> wrote:
>
>In article <cnvkhv$aco$1@panix2.panix.com> kludge@panix.com writes:
>
>> >Ken Kantor's company after NHT Pro (before his present one) had an
>> >instantantaneously steerable subwoofer
>
>> How many individual drivers did it have?
>
>I can't recall for sure but my impression is that it had two
>back-to-back and maybe a third one. Kind of worked like an MS
>microphone in reverse (or an ILS). Lotsa DSP

That doesn't give you much control. With two drivers you can make a figure-8
with a single null plane, and you can steer it a little bit at different
frequencies, but you really need a whole wacking load of drivers to give real
directional control. It might be enough, though. That would be a fun thing
to try.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

[Guest]

Archived from groups: rec.audio.pro (More info?)

<< How many individual drivers did it have? I have often stacked two or three
subwoofers into a line array to get directionality and then moved them
around to get the room peaks and troughs evened out as much as possible,
when doing PA work. But it would seem to get truly accurate directional
control, you'd need a whole lot of drivers. Or (heaven forbid) a bass horn.
--scott >>



Meyer has a cardioid sub box using DSP & multiple drivers, & it looks like the
new EAW SB730 sub is doing something similar, though maybe passively.

Scott Fraser

 

[Tony]

Archived from groups: rec.audio.pro (More info?)

On 23 Nov 2004 10:36:16 -0800, makolber@yahoo.com (Mark) wrote:

>Goggle ACTIVE BASS TRAP
>
>I thought of this about a year ago as a cool new idea to get rich,
>unfortunatlry someone else thought of it before me.
>
>Mark

True - in fact countless people countless times over a period of many
decades.

Tony (remove the "_" to reply by email)

 

[Guest]

Archived from groups: rec.audio.pro (More info?)

The IAS sub only used two drivers, plus a lot of DSP. The idea isn't
to "aim" the sound, per se, since that would require a much larger
array. The idea is to alter the directivity index as a function of
frequency, to compensate for energy storage in the room.

The approach also gives you a fighting chance at matching the
directivity of the sub to the sats at the crossover point. (This is
often a problem with the sound of most sub/sat systems, in my
opinion.) For example, in one of our demo rooms, we mated the subs to
a pair of Quads. The subs were fully monopolar at the lowest
frequencies, and gradually transitioned to dipolar operation at the 80
Hz crossover point. The goal was to try and get the a fairly seamless
integration, while preserving the really deep bass.

-k



mrivers@d-and-d.com (Mike Rivers) wrote in message news:<znr1101230282k@trad>...
> In article <cnvkhv$aco$1@panix2.panix.com> kludge@panix.com writes:
>
> > >Ken Kantor's company after NHT Pro (before his present one) had an
> > >instantantaneously steerable subwoofer
>
> > How many individual drivers did it have?
>
> I can't recall for sure but my impression is that it had two
> back-to-back and maybe a third one. Kind of worked like an MS
> microphone in reverse (or an ILS). Lotsa DSP