after looking at your pics of the radio I see it has had the extra final installed. the mylar on the driver looks bad 1st off. can not tell what is on the finals. and yes you will need a heat sink on the back with dual finals. . 1st off how does whoever have the echo board grounded. you should have a sheild wire running to the mic plug. and there should be a main ground running to some where on the board. they should be hooked up in seperate locations such as the shield to the mic shied and the main ground to the main board. if it is like that and you still have feedback try ubhooking the main board ground and see how it does. some times the main board ground will cause a squeal so try unhooking it to see if the squeal goes away if you need to.
what kind of wattage are you seeing out of the radio with the extra final in it? did not see how he added the extra final with the extra components not added to complete the 2nd stage for the added final.. make sure you have an insulator on all the parts as required.
let us know what you try and how it works.
what kind of wattage are you seeing out of the radio with the extra final in it? did not see how he added the extra final with the extra components not added to complete the 2nd stage for the added final.. make sure you have an insulator on all the parts as required.
let us know what you try and how it works.