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RGP



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Topic # 111160 25-Oct-2012 22:32
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Hi - I am installing a sound system throughout the house for background music - doesn't need to be extra loud or of great quality . I have 5 of these speakers from Jaycar

http://www.jaycar.co.nz/productView.asp?ID=CS2445&form=CAT2&SUBCATID=1008#4

each with this volume control

http://www.jaycar.co.nz/productView.asp?ID=AC1685&keywords=attenuator&form=KEYWORD

connected in series. I am using an old Denon amp to drive them. It dosen't like it - it's getting hot!

What am I doing wrong?

thanks Ross 


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  Reply # 706660 26-Oct-2012 08:41
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Well if you have them wired in parallel and they are 8 ohm speakers then you are presenting your amp output with 1.6 ohms.
No wonder it's complaining. It's being somewhat stressed. If they are 4 ohm speakers the problem is even worse (0.8 ohms).
Can you supply some more info?

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  Reply # 706666 26-Oct-2012 08:48
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Yeah the website doesn't list the 'ohm' rating for these speakers. With some careful configuration you could probably get even numbers of pairs to work ok, but yeah, it's not just as simple as connecting them all up.

RGP



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  Reply # 707082 26-Oct-2012 17:55
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Yes, I've connected them in parallel. No markings on the speaker as to what ohm they are rated at.
Thanks Ross

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  Reply # 707208 26-Oct-2012 21:54
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Your Denon amp, does it have A+B speakers?

RGP



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  Reply # 707221 26-Oct-2012 22:27
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no -its an old one, may need to upgrade

thanks Ross

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  Reply # 707227 26-Oct-2012 22:52
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Hang on, have you connected them in series, or in parallel?

Have a look at this YouTube video to get an idea on how to connect them in series.
That way you can match the speakers to your amp correctly (assuming your amp can drive the Jaycar cheapies).

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  Reply # 707241 26-Oct-2012 23:45
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Sorry, do you have 5 speakers (2x pairs +1) or, 5 pairs?
I assume it's 5 pairs since, you have 5 volume controllers?
And each pair goes from your amp, via a vol control, to the left and right of each pair?
And you've connected all the -lefts together, all the +lefts together, ditto for the rights and then connected them to the respective speaker terminals on the amp?

RGP



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  Reply # 707310 27-Oct-2012 09:15
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thanks Hidefinition - thats exactly how I've connected them although these speakers are stereo speakers ie each speaker has a left and right connection, so there are five speakers in total.

Hi Dunnersfella - connected in parallel - got it wrong in my original post. No link to youtube but will search for it

thanks guys

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  Reply # 707807 28-Oct-2012 11:11
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you cant series them if you want individual volume control as they will all effect each other.

I just ended up getting several dirt cheap class T amps off ebay. 12V in and speaker out. google on bypassing the tone controls because they are crap. PC powersupply running 3 of them no worries.




Richard rich.ms

RGP



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  Reply # 711910 4-Nov-2012 21:20
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Thanks for your replies -the T amps look like the way to go if I was doing it again. Looks like I should have purchased these http://www.jaycar.co.nz/productView.asp?ID=AC1665&keywords=attenuator+volume&form=KEYWORD as they maintain a correct impedance match between amp and speaker - up to 8 speakers. Will see if Jaycar will take the ones I have back

cheers
Ross


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