[rollei_list] Re: Completely OT- Loudspeaker info a pop up question
- From: Jerry Lehrer <jerryleh@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 16 Feb 2005 20:19:45 -0800
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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