Speaker impedance matching
ara...@my-dejanews.com
manuak says that I should use 16 ohm speakers. The problem is that nobody
imports that kind of speakers to where i live but i can get a good pair of 8
ohm speakers. Is there any way of using them without harming my amp. Someone
told me thar using wo speakers in paralel for each output should do the trick
but that's definately not a solution. Is there any circuit i can build to
"simulate" a 8ohm speaker. I know very little electronics if it where
resistance a series 8 ohm resistor should work, but i don't know if this
works for impedance also.
-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum
Jerry G.
in parelle will give you 4 ohms. You can put 4 ohm 10 Watt
resistors in series with the 8 ohm speakers. The total DC resistance
will be 12 ohms, but you amp will take that. You will however have
about a 50% loss of volume.
I have solved such situations with 4 ohm 10 Watt resistors in
series. If the amp is a powerfull one, I suggest using 4 ohm 25 Watt
resistors.
The other good solution is having 2 sets of 8 ohm speakers and putting
2 in series on each channel. This make 4 in total. You will get the
total sound and be impedance matched. The speakers should be
identical units. Infact you may like the sound that you get because
you will now have more sound!!!
Greetings from Montreal, Canada
Jerry Greenberg
--
=====================================
Quick Reply To: jerr...@hotmail.com
If It Works, Don't Fix It !
If It Don't Move, Slap It !
If It Don't Make Noise, Shake It !
If It's Broke, Then Fix It ... !
If You Don't Know How To Fix It, Give It Out !
WebSite http://www.total.net/~jerryg
May The Big Blue Screen Of Death Bestow All Spammers!
============= Message Seperator ================
ara...@my-dejanews.com wrote in message
<6p43e7$hjj$1...@nnrp1.dejanews.com>...
Michel Savard
Tom MacIntyre
>
>--------------661BF6381F7CF272E4328AC3
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>
>I don't believe that the mismatch from 8 ohms speakers to an 16 ohms amplifier
>o/p is that critical. Putting a resistor in series only draws current without
>actually helping the sound quality in any way. I suggest you better off just
>keeping the 8 ohms speakers alone.
It won't draw current, but it'll drop voltage...I agree with the rest,
with 2 provisos...in some amps, this may fry the transformer (marginal
designs)...especially if you push the output level hard. Good luck.
Tom
Charles E.
ohms. I guess it would work ok until you cranked up the unit.
I suggest you not mess with the output impedance because it was made that
way for a reason and it you mess with amplifier loads you
are asking for trouble
KuoH
asking about surround speakers. Unless this is a Dolby 5.1 setup, the
surround channel is in mono. In most amps with two surround speaker
output terminals, they are wired in series internally. The labels
usually state "8 to 16 ohms" without being very specific. Though they
may exist, I have yet to see a 32 ohm load requirement for this
application.
If however this is indeed the case then using two 8 ohm speakers in
SERIES, as opposed to parallel per the original message, for each output
should be fine. In fact, this will actually provide for better
delocalization of the surround speakers and improve the surround effect,
provided the speakers are placed appropriately.
KuoH
Brent Philion
arrays that are guitar stacks and PA cabs can handle 4 ohms when they
are all running speakers of roughly the same impedance
when 2 speakers are attached in Parralel their impedance rises so if
you could get 8 ohm speakers and use 2 8 ohhms in parralel will act
the same as a 16 ohm (though that will mean 4 speakers and possibly
double your cost for 2 channels)
Brent Philion
Sam Goldwasser
--- sam : Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Latest Sam stuff: http://www.repairfaq.org/sam/
Lasers: http://www.repairfaq.org/sam/lasersam.htm
http://www.misty.com/~don/lasersam.html
Brent Philion
like I'll explain it in a sentence
2 speakers in parralel double their impedances
2 speakers in series halve their impedances
Curenly I don't know the pattern for an unmatched pair
On 29 Jul 1998 12:29:18 GMT, s...@stdavids.picker.com (Sam Goldwasser)
wrote:
Tim Watkins
>
> Ok now that i read over that piost and see what 2 am grammear looks
> like I'll explain it in a sentence
> 2 speakers in parralel double their impedances
> 2 speakers in series halve their impedances
>
> Curenly I don't know the pattern for an unmatched pair
You've still got it backwards....
Tim
VPR
The rear surrounds are in series, you will not find a left or right amp for the
surround speakers, theres only one pair of complementary symmetry transformerless
outputs (the surround Amp) Most home systems are at 8ohm, only in car situations
do they change radically. So by using two surround speakers of 8 ohms each, you
will be safe.
ara...@my-dejanews.com wrote:
> I have a stereo with two extra speaker outputs for surround speakers. The
> manuak says that I should use 16 ohm speakers. The problem is that nobody
> imports that kind of speakers to where i live but i can get a good pair of 8
> ohm speakers. Is there any way of using them without harming my amp. Someone
> told me thar using wo speakers in paralel for each output should do the trick
> but that's definately not a solution. Is there any circuit i can build to
> "simulate" a 8ohm speaker. I know very little electronics if it where
> resistance a series 8 ohm resistor should work, but i don't know if this
> works for impedance also.
>
> -----== Posted via Deja News, The Leader in Internet Discussion ==-----
> http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum
--
Remove nospam and add vrepair1 when replying
RalphWM
Some recievers have the rear surround in parrallel. But BOTH of the rear
surround in ALL Dolby ProLogic have the same program material.
Ralph
>Subject: Re: Speaker impedance matching
>From: VPR <nos...@tampabay.rr.com>
>Date: 7/29/98 1:27 PM Eastern Daylight Time
>Message-id: <35BF5C2E...@tampabay.rr.com>
Ralph Wade Phillips
Brent Philion wrote in message <35bf4fe9...@news.vianet.on.ca>...
>Ok now that i read over that piost and see what 2 am grammear looks
>like I'll explain it in a sentence
>2 speakers in parralel double their impedances
>2 speakers in series halve their impedances
>
>Curenly I don't know the pattern for an unmatched pair
Nope. You STILL have this backwards.
You can replace the impedance with resistance for a simple solution
(DC based), and you get that two identical resistors IN PARALLEL HALF their
resistance.
So it is with speakers.
RwP
VPR
(or at least meant?)
RalphWM wrote:
--
remove nospam and add vrepair1 to reply
Tom MacIntyre
>Ok now that i read over that piost and see what 2 am grammear looks
>like I'll explain it in a sentence
>2 speakers in parralel double their impedances
>2 speakers in series halve their impedances
No ...2 equal impedance speakers in series double
2 equal impedance speakers in parallel halve
>
>Curenly I don't know the pattern for an unmatched pair
In series they simply add, in parallel, the reciprocal of the total
impedance equals the sum of the reciprocals of the individual
impedances.
Actually, these rules are for resistance, not impedance, but it's
usually close enough for speakers.
Tom
>