4 ohm 8 ohm same time?

[Boozehound]

Hi, question for the experts.

I am running some Klipsch forte 1's at 4 ohms as the speakers call for
on a sony rec. speaker (A) stereo.

The question is could I add some 8 ohm speakers on speaker (B) stereo
at the same time without harming anything.

Running the 4 ohm and 8 ohm. at the same time?

Thanks in advance for any responce.

 

[timofred]

Afaik, the amp should handle it.
They will probably be a bit quieter.

 

[dan-c]

Hi, question for the experts.

I am running some Klipsch forte 1's at 4 ohms as the speakers call for
on a sony rec. speaker (A) stereo.

The question is could I add some 8 ohm speakers on speaker (B) stereo
at the same time without harming anything.

Running the 4 ohm and 8 ohm. at the same time?

Thanks in advance for any responce.

I sincerely hope you're not trolling

Looky

Afaik, the amp should handle it.
They will probably be a bit quieter.

:sigh:



Really?

 

[petehall347]

what receiver ?
if they connect in parallel it works out about 2.6 ohms so most likely not a very good idea at all

 

[Zonian]

NO!!!

Do the math:

Ohms times Ohms divided by Ohms plus Ohms equals the new resistance.

In your case: 8 times 4 (32) divided by 8 plus 4 (12) equals 2.666...

YOUR AMP IS NOT DESIGNED TO HANDLE THAT RESISTANCE!!!

You WILL cause damage!

 

[Markw]

if they connect in parallel it works out about 2.6 ohms so most likely not a very good idea at all

+1

 

[Boozehound]

+1

Markw:

Thank you.

It is better to ask first.

 

[markn2wae]

One possible solution.

Connect the "A" output of the amp. to a speaker switch box that incorporates internal resisters that protect the amp. from too low an impedance.:scratch2:

Sorry, no model numbers come to mind, but there are units like this for sale, as well as the simpler ones that provide just switching (like on your amp.) but NO protection!:sigh:

Mark T.

 

[KentTeffeteller]

Unless you have a speaker selector switch which gives a safe load to the amplifier, not recommended. That 2.6 ohm load you'd get without is not safe for the amplifier you have.

 

[musichal]

Get a separate amp for the other speakers, which I assume will be in a remote location because, unless your room is HUGE, why would you need or want to play any other speaker simultaneously in it?

 

[Poultrygeist]

For many years I drove a pair of 4 ohm ADS L710's with an old Marantz integrated on one set of outputs in one room while simultaneously powering some 8 ohm Athena's in another room from the second set of outputs. Even with long runs of speaker wire running under the house it was never a problem and the Marantz ran cool to the touch.

 

[petehall347]

what receiver model is it ? we don't know how the internal wiring is without knowing .
or what its ratings are .

 

[Boozehound]

what receiver model is it ? we don't know how the internal wiring is without knowing .
or what its ratings are .

Ok sure, It is a cheap Sony STR -DE635


I would be adding a pair of Klipsch 8 ohm RF-62 11 speakers
To the Stereo mix.

 

[AlTinkster92]

Thanks for that Ohm formula Zonian, I learned something today!

 

[PickyEars81]

You just need to keep it cool. Keep your receiver in a pool of water while you run it

 

[petehall347]

here you go this is from the manual ..looks like you can use your speakers after all http://esupport.sony.com/US/p/model...late_id=1&region_id=1&tab=manuals#/manualsTab

 

[fips152]

Boozehound,

If you aren't using the Sony STR-DE635 as a 5.1-channel system, but as just a stereo system, you can...

(1) Leave the 4-ohm speakers connected as the A speakers.

(2) Be sure to put the "Front IMPEDANCE SELECTOR" slider switch on the back panel to 4 ohms if you haven't already done so.

(3) Hook up the 8-ohm speakers to the REAR channel connections and position those speakers where you really want them, as a second pair of front speakers. The REAR channels are driven by their own separate amplifiers and the speakers won't be in parallel with the front A speakers.

(4) Push the SET UP button and set the front and "rear" speakers to LARGE, set the CENTER and "SUB WOOFER" speakers to NO, then set the real distances for the FRONT and REAR speakers.

(5) Press TEST TONE on the remote and adjust the loudness of the four speakers so that each speaker has the same loudness. Adjust the loudness of the speakers with the remote, not from the receiver's front panel.

You'll be able to listen to just the FRONT speakers by selecting the 2CH setting, or both the FRONT and REAR speakers by selecting one of the surround-sound modes. You won't be able to listen to the REAR speakers by themselves.

You'll probably want to avoid the weird 5.1 settings like Cinema Studio A/B/C and stick with either 2CH to use your A speakers by themselves, or,
to use all four speakers, the Sound Field options NORMAL SURROUND, MONO MOVIE, or STEREO MOVIE.

The NIGHT THEATER sound field might be good for listening to all four speakers at low volume levels. It acts much like a "Loudness" button on normal two-channel receivers, boosting the bass, and maybe the treble a bit, to make up for non-linearities in human hearing so that the bass isn't lost when listening at a low volume.

Good luck!

P.S. A PDF copy of the manual is at:
http://www.docs.sony.com/release/STRDE635.PDF

 

[Boozehound]

Boozehound,

If you aren't using the Sony STR-DE635 as a 5.1-channel system, but as just a stereo system, you can...

(1) Leave the 4-ohm speakers connected as the A speakers.

(2) Be sure to put the "Front IMPEDANCE SELECTOR" slider switch on the back panel to 4 ohms if you haven't already done so.

(3) Hook up the 8-ohm speakers to the REAR channel connections and position those speakers where you really want them, as a second pair of front speakers. The REAR channels are driven by their own separate amplifiers and the speakers won't be in parallel with the front A speakers.

(4) Push the SET UP button and set the front and "rear" speakers to LARGE, set the CENTER and "SUB WOOFER" speakers to NO, then set the real distances for the FRONT and REAR speakers.

(5) Press TEST TONE on the remote and adjust the loudness of the four speakers so that each speaker has the same loudness. Adjust the loudness of the speakers with the remote, not from the receiver's front panel.

You'll be able to listen to just the FRONT speakers by selecting the 2CH setting, or both the FRONT and REAR speakers by selecting one of the surround-sound modes. You won't be able to listen to the REAR speakers by themselves.

You'll probably want to avoid the weird 5.1 settings like Cinema Studio A/B/C and stick with either 2CH to use your A speakers by themselves, or,
to use all four speakers, the Sound Field options NORMAL SURROUND, MONO MOVIE, or STEREO MOVIE.

The NIGHT THEATER sound field might be good for listening to all four speakers at low volume levels. It acts much like a "Loudness" button on normal two-channel receivers, boosting the bass, and maybe the treble a bit, to make up for non-linearities in human hearing so that the bass isn't lost when listening at a low volume.

Good luck!

P.S. A PDF copy of the manual is at:
http://www.docs.sony.com/release/STRDE635.PDF

Fips 152-

Yes, stereo only. Good news as the seconed pair of speakers can be put to use now,without any smoke..

Thank you for all the info.