[rollei_list] Re: jerry : refrasede Completely OT- Loudspeaker info a pop up question

Thanks john - I will dig into the litterature - cheers ruben
----- Original Message ----- 
From: "John Jensen" <jwjensen356@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, February 17, 2005 12:32 AM
Subject: [rollei_list] Re: jerry : refrasede Completely OT- Loudspeaker info 
a pop up question


> There was a magazine called 'Speaker Builder'
> published by Old Colony Sound Labs (who published
> other audio DIY publications).  They melded their
> several publications into the current one they
> publish, Audio Xpress.  But they do have a series of
> books that are based on the articles in the past
> magazines.  For the speaker books, go to:
>
> http://www.audioxpress.com/bksprods/bkindexldesign.htm
>
> These may be of interest to you.
>
> John
>
> --- Ruben <ruben@xxxxxxxxx> wrote:
>
>> Thanks Jerry
>> All the speakers I have are "units" taken out of the
>> cabinetts for one
>> reason or the other (not by me) all paired as in two
>> 12" bass unit etc. and
>> two tweeter units but they may not come from the
>> same set of speaker
>> cabinets - could be tweeters come from JBL model A
>> and midtone speakers from
>> JBL model B - So it is not like I am going to ruin
>> an exhisting set of
>> beutifull B&W speakers! It would be like putting my
>> self above the allmighty
>> and for that there is only nemesis - SO TO GET BACK
>> TO my initial question -
>> apart from the impedance thing that I need to get
>> straitened out - can any
>> of you fine gentlemenn recommend a good book on
>> building speakers ??? and
>> making cross over filters hov to calculate cross
>> over filters ??? etc in
>> order to make some speakers that are plain nice to
>> listen to and will not
>> ruin your amplifier ??? I am and will ot turn into a
>> HI-FI use all my money
>> on gear freak (I spent it on lenses and cameras
>> anyway) but I would like to
>> have some decent speakers in my own design - I will
>> be trying to use two
>> older mono tube amplifiers so my listing preference
>> would be more in terms
>> of soft and with great bokeh and not as crisp as the
>> newest Zeiss lenses :-)
>> thanks Ruben
>>
>> ----- Original Message ----- 
>> From: "Jerry Lehrer" <jerryleh@xxxxxxxxxxx>
>> To: <rollei_list@xxxxxxxxxxxxx>
>> Sent: Wednesday, February 16, 2005 10:08 PM
>> Subject: [rollei_list] Re: Completely OT-
>> Loudspeaker info a pop up question
>>
>>
>> > Ruben,
>> >
>> > Hoo boy!!  We gotta go BEFORE Audio 101.
>> Impedance is NOT the
>> > same as pure resistance, it is frequency
>> dependent.  The LAST thing you
>> > want to do is put a resistor in series with a
>> speaker.
>> >
>> > Please don't screw with the Kef or B&W speakers!
>> They are PFG as
>> > they are.  It takes an expert to improve them.
>> >
>> > Jerry
>> >
>> > Ruben wrote:
>> >
>> >> I see that you are talking loudspeakers and I
>> have a couple of questions
>> >>
>> >> 1. On an amplifier it is often statet to use only
>> 8 ohm speakers - I I
>> >> have
>> >> a speaker unit and it mesures 8 ohm when an Ohm
>> meter is attached to the
>> >> + -
>> >> I guess it is ok - but what if there are more
>> thant one speaker ?  or my
>> >> speaker set is only 4 Ohm - can you just put a
>> resitant 4 ohm on the wire
>> >> and everything is cool ???
>> >> 2. I have several boxes with speaker units, from
>> jbl, cervin vega,
>> >> pearless,
>> >> b&o, kef and b&w - I would like to built new
>> cabinets and could use a
>> >> guide
>> >> to both "spliting filters" - cabinet acoustics
>> etc. Can you recommend
>> >> books
>> >> on do it your self high end speakers ??
>> >>
>> >> thanks and sorry for jumping into your thread
>> >>
>> >> Ruben
>> >>
>> >> ----- Original Message -----
>> >> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
>> >> To: <rollei_list@xxxxxxxxxxxxx>
>> >> Sent: Wednesday, February 16, 2005 12:30 PM
>> >> Subject: [rollei_list] Re: Completely OT-
>> Loudspeaker info
>> >>
>> >> >
>> >> >
>> >> > -----Original Message-----
>> >> > From: "A. Lal" <alal@xxxxxxxxxxxxx>
>> >> > Sent: Feb 15, 2005 10:18 PM
>> >> > To: rollei_list@xxxxxxxxxxxxx
>> >> > Subject: [rollei_list] Re: Completely OT-
>> Loudspeaker info
>> >> >
>> >> >
>> >> > Jerry, a bare ribbon would in fact behave like
>> a dipole. However, in
>> >> > many designs material is put on othe back side
>> to try to damp out
>> >> > resonances.
>> >> >
>> >> >   There have been ribbon speakers that used an
>> impedance tube at the
>> >> > back
>> >> > of the ribbon similar to the method used by RCA
>> for directional
>> >> > microphones. For a ribbon speaker an absorptive
>> box probably would do.
>> >> > The
>> >> > path length around the ribbon structure is what
>> controlls the minimum
>> >> > frequency it can radiate with any efficiency.
>> This is different from
>> >> > damping of resonances.  What is needed if both
>> sides of the speaker are
>> >> > to
>> >> > be open to the air is a large enough baffle so
>> that the path around it
>> >> > is
>> >> > longer than a half wave at the minimum
>> frequency of interest.
>> >> >   It seems to me that what the "dipole" speaker
>> people are doing is an
>> >> > old
>> >> > trick of exciting the reverberant field with
>> the back radiation.
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > Richard Knoppow
>> >> > dickburk@xxxxxxxxxxxxx
>> >> > Los Angeles, CA, USA
>> >> >
>> >
>> >
>>
>>
>>
>
>

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