Putting a horn to a bass amp in my case an Ampeg B-100R.I had some difficulties because of the impedance.The problem is that the horn is 8ohm, and the speaker 4ohms, so i had to wire it somehow and i used for it this link. Although the amp is a little bit quieter than it was before, the sound is definitively better, now all i need is a crossover .This is how it looked like:

Putting it appart

The horn, taking one edge away

Making a hole

bigger one

Installing it

and this is it