[rollei_list] Re: Completely OT- Loudspeaker info a pop up question
- From: "A. Lal" <alal@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 17 Feb 2005 08:02:30 -0500
I believe the Peerless you refer to was an altogether different
comapany. The Peerless brand name was used by Altec-Lansing in the
early days of hi fi. Altec (All Technical Products) was an off-shoot of
Western Electric. WE pretty much wrote the book on all aspects of sound
reproduction, Blumlien and EMI only made minor contributions in
comarisison. Anyone interested in hi Fi should have a look at early
numbers of the Bell System Technical Journal, by the way. Later on Jim
Lansing left Altec and went on to found JBL (James B. Lansing), now
part of the Harman group. I'm sure the older members of the list can add
to this. Jerry, Richard?
Today there are two companies making speakers under the Peerless brand
name. One, in Denmark, is part of the DST group, the other, in India,
makes low cost OEM drivers some of which were used in KEF's and other
makers lower priced systems. At one time the two Peerless' were linked
but now they operate as separate companies.
> -----Original Message-----
> From: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Jerry Lehrer
> Sent: 16 February, 2005 23:20
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Completely OT- Loudspeaker info a
> pop up question
>
>
> Richard,
>
> Peerless (not Pearless) built some high efficiency tweeters
> in the "old
> days".
>
> Jerry
>
> Richard Knoppow wrote:
>
> > ----- Original Message -----
> > From: "Ruben" <ruben@xxxxxxxxx>
> > To: <rollei_list@xxxxxxxxxxxxx>
> > Sent: Wednesday, February 16, 2005 4:16 AM
> > Subject: [rollei_list] Re: Completely OT- Loudspeaker info a
> > pop up question
> >
> > >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
> >
> > The impedance of a loudspeaker is not its DC resistance
> > and can not be measured with an ohm meter.
> > Some of the drivers you have were intended to be used in
> > specific systems. Its possible to use them in a home built
> > box but for an optimum box you have to make a lot of
> > measurements on them. Small low frequency speakers such as
> > those used by KEF, B&O, and B&W are intended to be used in
> > rather small boxes of the sort I mentioned earlier where the
> > box stiffness becomes part of the restoring force of the
> > speaker. Cerwin-Vega built mainly high power speakers for
> > sound re-inforcement or musical instrument use. JBL has made
> > an enormous number of models over the years some of which
> > are specific to JBL systems and some of which are general
> > purpose speakers. I am not familiar with Pearless.
> > I am enough out of touch with audio that I don't know of
> > a book currently in print that covers crossover networks but
> > most of the older books on audio did. Simple networks work
> > fine. I may be able to give you specific help off list.
> >
> > ---
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
>
>
>
>
>
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