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

I think that the Peerless I brought up was the Danish ones since I originate 
from Denmark and I took them out of some old Danish speaker cabinetts from 
the 70 ties that had been damaged while the units survived :-) I was not 
aware of an American Peerless production :-)

----- Original Message ----- 
From: "A. Lal" <alal@xxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, February 17, 2005 2:02 PM
Subject: [rollei_list] Re: Completely OT- Loudspeaker info a pop up question


>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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>>
>
>

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