| How to bridge a Realistic amp with the less components - Click HERE for Original Thread |
| Guss |
| Hi there, I'm willing to bridge my old amp so I can match a sub. Since I got no idea of where to start I am asking you guys where to look. I guess bridge differs from amp to another, what do I need? Finally, how to bridge it :rolleyes: Thanx if u can help ! |
|
|
| theChris |
you need an inverted signal somewhere. basically you need two amps with:
amp/channel 1+ = +V
amp/channel 1- = 0
amp/channel 2+ = 0
amp/channel 2- = -V
from this we can attach +V and -V to a speaker to get 2V.
finally, each amplifer must be stabel to 4ohm if an 8ohm speaker is used. stable to 2ohm for a 4ohm speaker. this is beacuse 0V will be at the center of the voice coil, and thus measuering impedacne from +V (or -V) to 0V will give Z/2.
the amplifers should also be equally powerful, but this isn't technically required. at high volumes the weaker amp would be more likely to fail or trip a protection circuit. |
|
|
| Guss |
| Could I consider Left and Right as different amps ? The only concern here was to get the signal from both channel, not to fix a lack of power... |
|
|
| Cybergent |
Sure you can bridge one stereo amplifier.
The speaker then connects between the two plus output binding posts of both channels.
But for driving the amp you need the input signal feeded directely to one channel and inverted to the other channel. So you need a small circuit thats acts as an amp with gainfactor -1.
As stereo amps normally are designed for a minimum load of 4 Ω the bridged amp then can only take 8 Ω. |
|
|
| Guss |
| quote: | | But for driving the amp you need the input signal feeded directely to one channel and inverted to the other channel. So you need a small circuit thats acts as an amp with gainfactor -1. |
Fine, but to do that I need the name of the circuit involved so I can build it. Damm I'd like to know everything sometimes, sorry to bother:D |
|
|
|
|
