How to bridge amp to power passive subwoofer?

[santeini]

Not Possible

It is not possible to bridge it as it is. Try trading your amp for a mono-block.

 

[Seth=L]

As I mentioned before, the NEC should be able to deliver nearly the full power (at least relative within less than a 3dB difference). The NEC will be more stable with low impedance loads when not bridged. YOU SHOULD USE JUST ONE CHANNEL. There is no reason to bridge the amplifier for anything other than experimental purposes (so if you wish to experiment you could just dish it out on the Goldstar and not torment the NEC).

Or get a new amp.

 

[maximoiglesias]

Thanks Seth....

...I'll do just that with the Golstar in the weekend.

Just for your info my Nec amp has a mono switch which I use when powering the subwoofer.
I also use this amp as a stereo system with a pair of old Tecnichs speakers and my old but trusty Sony CD player.
I have the subwoofer connected to speakers A and the Technics to speakers B.
The subwoofer input in AUX and the CD player in TAPE IN 1 .

I also take advantage of the two 10 inch woofers of the Technics when I need additional bass using them as subs. (AUX - speakers B)

As you can see I like to play around with my system.

 

[Seth=L]

As you can see I like to play around with my system.

I guess so.

 

[johns]

NAD 3100 series are bridgeable intergrated and lower 3000 series was also .
I bridged mine with a NAD amp that was matched , it was very good idea by NAD back then .
I looked also for his NEC on line also couldn't find anything .

I have twoo home amps I want oo bridge so I can run my sub woofer any help would be great

 

[zumbo]

As many have mentioned, if your amp doesn't clearly describe on the back panel, or you don't have the manual that tells you how, don't do it. Period.

In my experience, many amps that are bridgeable don't use a generic schematic. Most are model specific. I have even encountered different schematics within the same brand, and model lines.

A working amp produces more power than a non-working one.

 

[highfigh]

I found this and other pages in internet, they are not serious audio specialists but it makes some sense.


By eHow Electronics Editor

Rate: (0 Ratings)

There are many reasons to bridge an amplifier, the main one being to get more power to your speakers and produce a better quality sound. Basically, the process lets you combine the power output of two channels into a single channel. This means that you can get more power to one speaker than you can to two that don't have the bridging in place.

InstructionsDifficulty: Moderate
Step1Read all the paperwork that came with your amp. It's important that you understand as much about your amp as possible before trying to bridge it. Often amplifiers come with a diagram for bridging, which makes your job a lot easier.
Step2Figure out how many channels you need to bridge. If you have a four-channel amplifier, then you'll be bridging it into a two-channel. A two-channel amp will be bridged into a single channel. So the bridged amp should have half the channels of the original amp.
Step3Identify the terminals. For each channel, you should see a positive and a negative terminal. So if your amp has two channels, there should be four terminals total. (A four-channel amp will have eight.) Label each with an identifier on a piece of masking tape, something like A: channel 1, positive; B: channel 1, negative; and so on.
Step4Connect the amplifier to the speaker properly. You should connect the red speaker wire to the terminal labeled A. Then connect the black speaker wire to the terminal labeled D. Then take a short wire and connect terminal B to terminal C to create a bridge between the two channels.
Step5Test your equipment to make sure it works properly.
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There's no reason to bridge from one negative to another. Stereo amps have common negative terminals unless it's true dual mono and in that case, you don't necessarily want to combine the two without checking with the manufacturer.

For most stereo amps that A) aren't tube amps or B) dual mono, it may be possible that it only requires inverting the signal to one channel and connect the speaker to both positive speaker terminals.

However, if the power supply isn't particularly robust, it's not going to yield the normal results, which is much higher output. Also, it's important to remember that the impedance seen by the amp will be lower than what it's designed for. It's possible that the power supply will run out of headroom extremely early and it could even damage the output section & speaker. Don't even think of using a 4 Ohm driver with a stereo amp that's designed for 8 Ohm speakers. That's equivalent to connecting the amp to a 2 Ohm load and damaging the amp is a sure thing.

The best thing to do is just buy an amp that's made for this application. A good pro-sumer amp isn't very expensive.