how to hook up sub to Nady power amp?

needtubes · 1st July 2004, 03:42 PM

I have a Nady Audio XA-1100 and have had it powering my sub for some time now. My sub is a DPL12, which is dual voice coil, so I hooked up one channel per voice coil. Each channel driving its 8-ohm load never got hot. But, I just feel that this could be bad for the driver if one VC isn't getting the same amount of power as the other.

So, I paralleled the VC's and hooked them to A channel only. A channel got quite warm when playing a lot, loudly. I didn't really want it to be warm... it has fans that run continuously (which are VERY annoying) and when it gets warm, the fans kick into high gear, which is even mroe annoying.

So, I decided to bridge the amp, thinking that maybe if both channels were used equally, it wouldn't get hot. The info sheets are located here. I am assuming from this diagram that when you select bridge, you take the output from both positive leads. Correct? Well, that is what I have done... and it is still getting very warm. Sounds really good, though.

Are there any dangers to running it bridged at all times? Which hookup method would you use and why? Thanks

Jan Dupont · 1st July 2004, 04:24 PM

Hi,
First: A woofer with two WC's are made to have each stereo channel connected to their own WC. If one WC gets a little hotter than the other makes no problems

Second: Your amp gets hot, because paralleling the two 8 Ohms WC's gives 4 Ohms. Your amplifier now sees halv the impedanse then before, and therefore it gets hotter than before

Last: Your bridging is right, however why only hear the bass of one stereo channel ??? Bridging is entended for use, if you have two amplifiers, each bridged and powering only one channel

I hope this has been some kind of help

sreten · 1st July 2004, 04:39 PM

Bridging your amplifier and connecting it to the DLP12 with both
coils in series should be the same as connecting each channel
to each voice coil, though you guarantee currents are equal.

Bridging into both coils in parrallel is OK as the amplifier is
specified to work into 2 ohms per channel and 4 ohm bridged,
(4 ohms bridged - each channel sees 2 ohm loading)
but IMO its a farly heavy load for the amplifier.

If you want it to run cooler connect the coils in series.

Only connect the coils in parrallel if the above isn't loud enough.

srten.

1st July 2004, 03:42 PM	#1
needtubes diyAudio Member Join Date: May 2003 Location: USA	how to hook up sub to Nady power amp? I have a Nady Audio XA-1100 and have had it powering my sub for some time now. My sub is a DPL12, which is dual voice coil, so I hooked up one channel per voice coil. Each channel driving its 8-ohm load never got hot. But, I just feel that this could be bad for the driver if one VC isn't getting the same amount of power as the other. So, I paralleled the VC's and hooked them to A channel only. A channel got quite warm when playing a lot, loudly. I didn't really want it to be warm... it has fans that run continuously (which are VERY annoying) and when it gets warm, the fans kick into high gear, which is even mroe annoying. So, I decided to bridge the amp, thinking that maybe if both channels were used equally, it wouldn't get hot. The info sheets are located here. I am assuming from this diagram that when you select bridge, you take the output from both positive leads. Correct? Well, that is what I have done... and it is still getting very warm. Sounds really good, though. Are there any dangers to running it bridged at all times? Which hookup method would you use and why? Thanks

1st July 2004, 04:24 PM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Hi, First: A woofer with two WC's are made to have each stereo channel connected to their own WC. If one WC gets a little hotter than the other makes no problems Second: Your amp gets hot, because paralleling the two 8 Ohms WC's gives 4 Ohms. Your amplifier now sees halv the impedanse then before, and therefore it gets hotter than before Last: Your bridging is right, however why only hear the bass of one stereo channel ??? Bridging is entended for use, if you have two amplifiers, each bridged and powering only one channel I hope this has been some kind of help __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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1st July 2004, 04:39 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Bridging your amplifier and connecting it to the DLP12 with both coils in series should be the same as connecting each channel to each voice coil, though you guarantee currents are equal. Bridging into both coils in parrallel is OK as the amplifier is specified to work into 2 ohms per channel and 4 ohm bridged, (4 ohms bridged - each channel sees 2 ohm loading) but IMO its a farly heavy load for the amplifier. If you want it to run cooler connect the coils in series. Only connect the coils in parrallel if the above isn't loud enough. srten.

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