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#16627 - 03/06/07 11:04 AM Speakers everywhere
Supertom Offline
Gunslinger

Registered: 01/12/06
Posts: 33
Loc: Syracuse
Just want to hook two speakers up for my center channel and there both 4ohm how can i do this ?
can i simply connect them together ??
+ to + - to -
or
+ to - - to +


Thanks
Supertom

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#16628 - 03/06/07 11:37 AM Re: Speakers everywhere
taylodr Offline
Gunslinger

Registered: 01/23/07
Posts: 43
Loc: Richmond, VA
You should be able to go:
AMP + to SPEAKER 1 +
then
SPEAKER 1 - to SPEAKER 2 +
then SPEAKER 2 - to AMP -
Hope this helps.
It should effectively put the speakers in series creating kind of an 8 ohm load.
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#16629 - 03/06/07 01:11 PM Re: Speakers everywhere
Supertom Offline
Gunslinger

Registered: 01/12/06
Posts: 33
Loc: Syracuse
Thanks for your response and help

what if i wanted to keep it a 4ohm load

AMP + to SPEAKER 1 +
then SPEAKER 2 +

AMP - to SPEAKER 1 1
then SPEAKER 2 1

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#16630 - 03/06/07 01:37 PM Re: Speakers everywhere
taylodr Offline
Gunslinger

Registered: 01/23/07
Posts: 43
Loc: Richmond, VA
To be honest, speakers are just like resistors, so from that combination you cant get 4 ohms. Using Ohm's Law (Sorry if this is too technical)
Paralell is this combination:
R1 = 4 & R2 = 4 & R = Total Resistance
Paralell is this combination:
1/R = 1/R1+1/R2
R = 2
Or Series
R = R1 + R2
R = 8
You can get a 4 Ohm load with both speakers.
I hope this helps.
_________________________
Outlaw Audio 990
Outlaw Audio 2200 (5)
Monitor Audio RS-6
Monitor Audio LCR
Philips Ambilight 42" HD Plasma
Project Debut III

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#16631 - 03/06/07 01:38 PM Re: Speakers everywhere
taylodr Offline
Gunslinger

Registered: 01/23/07
Posts: 43
Loc: Richmond, VA
Sorry, that was supposed to read "can't get a 4 Ohm load"
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Outlaw Audio 990
Outlaw Audio 2200 (5)
Monitor Audio RS-6
Monitor Audio LCR
Philips Ambilight 42" HD Plasma
Project Debut III

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#16632 - 03/06/07 02:08 PM Re: Speakers everywhere
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Taylodr's right - you can't connect two 4-ohm speakers to a single amp and still have a 4-ohm load. Fortunately, he remembered Ohm's Law enough to figure out what combination of connections to use to avoid a 2-ohm load. Even a really good amp will thank you for sparing it that difficult a load.

I'm curious why you would want to keep it a 4 ohm load, since an 8 ohm load will always be easier on the amp. Granted, your 7500 will handle a 4 ohm load quite comfortably, but it'll do 8 ohms at least as well.
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#16633 - 03/06/07 02:33 PM Re: Speakers everywhere
Supertom Offline
Gunslinger

Registered: 01/12/06
Posts: 33
Loc: Syracuse
mostly i wanted to keep everthing 4ohm because all my speakers are 4ohm ((6) al-III Plus)

and i'am OhM illiterate
if ohm's are like resistors
how can less resistance be harder to power (no real need to anawer)

tobe honest buying OutLaw Stuff is the First time i ever bought Stereo Equipment without listening to it for awhile first (mostly i just can't hear Spec's) But this forum is LEARNIN me Alot
Thanks
Supertom

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#16634 - 03/06/07 04:55 PM Re: Speakers everywhere
gonk Offline
Desperado

Registered: 03/21/01
Posts: 14054
Loc: Memphis, TN USA
Wrote this about two hours ago, then left to go to a meeting....

Each amp channel operates independently, so there's no problem with one channel operating with a different load than other(s). It's quite common for folks to have different impedances.

As for why lower impedances are more difficult, my mostly-mechanical background leaves me in a difficult place for explaining that clearly. A little web search turned up this article , but I don't know how much it'll help you. This article may be a bit more practical.
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gonk
HT Basics | HDMI FAQ | Pics | Remote Files | Art Show
Reviews: Index | 990 | speakers | BDP-93

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#16635 - 03/06/07 07:51 PM Re: Speakers everywhere
taylodr Offline
Gunslinger

Registered: 01/23/07
Posts: 43
Loc: Richmond, VA
Once again it has to do with ohm's law, but long story short, the less Ohm's the more current (amperage) needed to equal power output.
Well, truthfully this is only one reason, but a really easy one to relate to.
_________________________
Outlaw Audio 990
Outlaw Audio 2200 (5)
Monitor Audio RS-6
Monitor Audio LCR
Philips Ambilight 42" HD Plasma
Project Debut III

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#16636 - 03/06/07 08:19 PM Re: Speakers everywhere
curriergroh Offline
Gunslinger

Registered: 03/12/06
Posts: 36
I was about to ask about ohms and then I saw this post.

Does what taylodr said mean that a 4 ohm speaker would need more current from the amp than a 6 ohm speaker and even more than an 8 ohm speaker, for the same loudness?

How does the 4 to 8 ohm switch on the 1070 change the picture?

And one more. Is it ok to run a 6 ohm speaker with the 1070 if 4 and 8 ohms are the only choices on the amp?

Thanks in advance for answering any of these.

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