How to find out the resistance of an NXT panel?

shambolic · 29th April 2010, 01:48 PM

Hi all, first post here

I have some 2'x3' NXT panels I bought off ebay some years ago and have just bought a new amp which requires adjusting of the ohmage according to the speakers resistance. Thing is I nowhere on these panels does it say what the resistance is nominal or otherwise. Can somebody advise me how I could find out what the resistance is on these speakers - they are a very obscure make '3nod'

LineArray · 1st May 2010, 06:44 AM

If you measure the DC resistance with a simple multimeter,
that should be sufficient to adjust your amp.

Just choose the value equal to the DC resistance or closest below.

shambolic · 1st May 2010, 01:57 PM

thanks for the reply. I have tried using a multimeter but nothing is registering with the NXT panels. I tried it with normal speakers to see if I had the right settings and they are registering but the Nxts nothing

LineArray · 2nd May 2010, 12:28 PM

Do you mean, you cannot measure the DC Resistance ?

Is it very high or very low ?

Usual panels have dynamic exciters with normal voice coils.

So there should be a DC resistance between 3 and 8 Ohms.

Either there is something damaged or you may have panels
driven by piezoelecric exciters ... i don't know.

Have you got a picture ?

richie00boy · 2nd May 2010, 01:30 PM

The NXT panels can't be measured with an ohmeter as they are a complex (capacitive) impedance. Your amp should be set to work with an 8 ohm load.

LineArray · 3rd May 2010, 05:44 PM

richie, do you know how these are driven ?

Flat panel speakers with usual dynamic exciters have normally
a pretty flat - mainly resistive - impedance.

richie00boy · 06:33 PM

They are not usual flat panels with usual dynamic exciters.

edit: hmm, looking on NXT website though they claim dynamic exciters with voice coils similar to conventional drivers. I'm sure this is different from how they first started out.

shambolic · 3rd May 2010, 07:57 PM

well I am definitely getting no readout at all with a multimeter

29th April 2010, 01:48 PM	#1
shambolic diyAudio Member Join Date: Apr 2010	How to find out the resistance of an NXT panel? Hi all, first post here I have some 2'x3' NXT panels I bought off ebay some years ago and have just bought a new amp which requires adjusting of the ohmage according to the speakers resistance. Thing is I nowhere on these panels does it say what the resistance is nominal or otherwise. Can somebody advise me how I could find out what the resistance is on these speakers - they are a very obscure make '3nod'

1st May 2010, 06:44 AM	#2
LineArray diyAudio Member Join Date: Mar 2008	If you measure the DC resistance with a simple multimeter, that should be sufficient to adjust your amp. Just choose the value equal to the DC resistance or closest below. __________________ Oliver, RFZ believer (?) www.dipol-audio.de

2nd May 2010, 12:28 PM	#4
LineArray diyAudio Member Join Date: Mar 2008	Do you mean, you cannot measure the DC Resistance ? Is it very high or very low ? Usual panels have dynamic exciters with normal voice coils. So there should be a DC resistance between 3 and 8 Ohms. Either there is something damaged or you may have panels driven by piezoelecric exciters ... i don't know. Have you got a picture ? __________________ Oliver, RFZ believer (?) www.dipol-audio.de

2nd May 2010, 01:30 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The NXT panels can't be measured with an ohmeter as they are a complex (capacitive) impedance. Your amp should be set to work with an 8 ohm load. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

3rd May 2010, 05:44 PM	#6
LineArray diyAudio Member Join Date: Mar 2008	richie, do you know how these are driven ? Flat panel speakers with usual dynamic exciters have normally a pretty flat - mainly resistive - impedance. __________________ Oliver, RFZ believer (?) www.dipol-audio.de


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1st May 2010, 01:57 PM	#3
shambolic diyAudio Member Join Date: Apr 2010	thanks for the reply. I have tried using a multimeter but nothing is registering with the NXT panels. I tried it with normal speakers to see if I had the right settings and they are registering but the Nxts nothing

3rd May 2010, 06:29 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	They are not usual flat panels with usual dynamic exciters. edit: hmm, looking on NXT website though they claim dynamic exciters with voice coils similar to conventional drivers. I'm sure this is different from how they first started out. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more Last edited by richie00boy; 3rd May 2010 at 06:33 PM.

3rd May 2010, 07:57 PM	#8
shambolic diyAudio Member Join Date: Apr 2010	well I am definitely getting no readout at all with a multimeter

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