What speakers can I use with my 4 ohm amp?
ShadowTek
audio. If I can,
I would like to replace those 4 satalite speakers with
the ones that I have left over from an RCA RV-9967 receiver, but I'm not
sure if that would be okay.
The 4 satalite speakers that came with the FPS2000 have 10watt @ 4ohm
stamped on the magnet. There is no detailed documentation for the amp
that comes with it, so I can only guess at the amp's rating based on the
speakers that came with it.
The 4 speakers from the RCA receiver that I would like to replace
them with are its two fronts (50 watts @ 8 ohm) and its two rears (25
watts @ 16 ohm).
Considering that the FPS2000's amp appears to have been designed for 4
ohm speakers, could I still use the 8 and 16 ohm speakers with it?
Would that harm the speakers or the amp to do that?
David Nebenzahl
> Considering that the FPS2000's amp appears to have been designed for 4
> ohm speakers, could I still use the 8 and 16 ohm speakers with it?
>
> Would that harm the speakers or the amp to do that?
Won't harm the amp, as it will basically be underloaded. You might
notice lower volume with the higher-impedance speakers.
--
You were wrong, and I'm man enough to admit it.
- a Usenet "apology"
geoff
No, the only potential harm would be if using speakers of *lower*
impedence.
geoff
ShadowTek
>
> No, the only potential harm would be if using speakers of *lower*
> impedence.
Thanks
AZ Nomad
>Thanks
No harm, but keep in mind that the power rating of the amp will be
halved.
Mr.T
"AZ Nomad" <azno...@PremoveOBthisOX.COM> wrote in message
news:slrnhn3s11.e...@ip70-176-155-130.ph.ph.cox.net...
> No harm, but keep in mind that the power rating of the amp will be
> halved.
*Less*, but not necessarily half for an amp with the usual unregulated power
supply, and usually more than half on a continuous basis in any case.
MrT.
geoff
The amp's power 'rating' won't be changed at all. The maxiumum power output
will be somewhat lower than that with the impedence speakers it was specced
at, probably around half.
geoff
AZ Nomad
Half the resistance and the power at the point where the amp
begins to clip will be halved.
AZ Nomad
doh. I mean, double the resistance and the power will be halved.
Mr.T
"geoff" <ge...@nospam-paf.co.nz> wrote in message
news:hsudnQOxmLbm2-7W...@giganews.com...
> >> No harm, but keep in mind that the power rating of the amp will be
> >> halved.
> >
> > *Less*, but not necessarily half for an amp with the usual
> > unregulated power supply, and usually more than half on a continuous
> > basis in any case.
>
Better read some real life specs then. The power rating will *almost always*
depend on the rated impedance, with any manufacturer worth a dime giving you
specs for 4 and 8 ohms, and for those amps that can handle it, 2 ohms.
>The maxiumum power output
> will be somewhat lower than that with the impedence speakers it was
specced
> at, probably around half.
I'm glad you used "probably", since that doesn't actually contradict what I
wrote.
MrT.
Mr.T
"AZ Nomad" <azno...@PremoveOBthisOX.COM> wrote in message
> >>> No harm, but keep in mind that the power rating of the amp will be
> >>> halved.
> >>
> >> *Less*, but not necessarily half for an amp with the usual
> >> unregulated power supply, and usually more than half on a continuous
> >> basis in any case.
>
output
> >will be somewhat lower than that with the impedence speakers it was
specced
> >at, probably around half.
>
> Half the resistance and the power at the point where the amp
> begins to clip will be halved.
If only it were as simple as you! What part of "for the usual unregulated
power supply", and for real life transformer losses and for actual
*transistor load curves*, and for heatsink/cooling design compromises
affecting continuous power output are you unfamiliar with?
Better to not comment on things you are unfamiliar with IMO.
MrT.
Mr.T
"AZ Nomad" <azno...@PremoveOBthisOX.COM> wrote in message
> >Half the resistance and the power at the point where the amp
> >begins to clip will be halved.
>
You got that last bit right at least
>I mean, double the resistance and the power will be halved.
For those living in virtual reality anyway. In the real world things get
slightly more complicated.
MrT.
AZ Nomad
Not really. if you've ever in your life looked at an amp's
specficiations given for 4 and 8 ohm loads, the 4 ohm load's power is
about double.
Peter Larsen
>> For those living in virtual reality anyway. In the real world things
>> get slightly more complicated.
> Not really. if you've ever in your life looked at an amp's
> specficiations given for 4 and 8 ohm loads, the 4 ohm load's power is
> about double.
Nope, 1.6 times 8 Ohm power in 4 Ohm is a better real world first
guesstimate.
Kind regards
Peter Larsen
geoff
Yep ABOUT.
geoff
geoff
> "geoff" <ge...@nospam-paf.co.nz> wrote in message
> news:hsudnQOxmLbm2-7W...@giganews.com...
>>>> No harm, but keep in mind that the power rating of the amp will be
>>>> halved.
>>>
>>> *Less*, but not necessarily half for an amp with the usual
>>> unregulated power supply, and usually more than half on a continuous
>>> basis in any case.
>>
>> The amp's power 'rating' won't be changed at all.
>
> Better read some real life specs then. The power rating will *almost
> always* depend on the rated impedance, with any manufacturer worth a
> dime giving you specs for 4 and 8 ohms, and for those amps that can
> handle it, 2 ohms.
Yep, and those ratings won't be changed.
>
>
>> The maxiumum power output
>> will be somewhat lower than that with the impedence speakers it was
>> specced at, probably around half.
>
>
> I'm glad you used "probably", since that doesn't actually contradict
> what I wrote.
Just expanding a little on what you wrote.
geoff
Mr.T
"AZ Nomad" <azno...@PremoveOBthisOX.COM> wrote in message
> >For those living in virtual reality anyway. In the real world things get
> >slightly more complicated.
>
> Not really. if you've ever in your life looked at an amp's
> specficiations
Why not try looking at some ACTUAL test results instead.
(Or if you had any idea how to, you could try making some measurements of
your own.)
> given for 4 and 8 ohm loads, the 4 ohm load's power is
> about double.
Yes, ABOUT. At least you now agree things are a little more complicated than
you first thought.
MrT.
AZ Nomad
Yes, "about". An 100W amp at 4 ohms may do about 60W at 8
ohms
Why are you so fucking anal about wether or not it is exactly half?
David Nebenzahl
It's in his job description, apparently.
Peter Larsen
Because thinking it ought to be "about" or "exactly" half indicates a less
than complete oomprehension of how a "standard" poweramp with an unregulated
powersupply works.
Kind regards
Peter Larsen
Mr.T
"Peter Larsen" <dig...@hotmail.com> wrote in message
news:4b750370$1$56771$edfa...@dtext02.news.tele.dk...
> > Why are you so fucking anal about wether or not it is exactly half?
>
> Because thinking it ought to be "about" or "exactly" half indicates a less
> than complete oomprehension of how a "standard" poweramp with an
unregulated
> powersupply works.
Thanks Peter, I'm glad someone realises pointing out incorrect, unqualified
statements is not just "fucking anal", even if those who are wrong like to
justify it to themselves that way.
MrT.