[rollei_list] Re: Completely OT- Loudspeaker info a pop up question
- From: "Ruben" <ruben@xxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 17 Feb 2005 07:42:12 +0100
Richard and Jerry
my spelling error - Peerless it was :-)
Ruben
----- Original Message -----
From: "Jerry Lehrer" <jerryleh@xxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, February 17, 2005 5:19 AM
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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