As promised here is the mod I have been mentioning around the forum lately... Unfortunately I did not do any before and after graphs, I was working on it with my analyzer, but was entrenched in the progress I was making..... What the mod does, is it changes the "slope" of the curve, so that a greater range of frequency has a larger boost, and as a result there is a steeper slope from the centre frequency. Also there is more gain in the Bass EQ so there is now a 15db boost at the centre frequency.... The resulting sound is the creamy fat bass when you boost it now. In fact the 200hz and 400hz options sound more like what you would expect, whereas in standard trim its all a bit disappointing.... All you need is 4 resistors. 2 x 1meg (1/4watt metal films) 2 x 2.2kΩ (1/4watt metal films) First picture shows the area you are working in. Its hard to follow the nonsense which happens around these switches with the circuit diagram, took me a while to figure out the signal flow in there, but you dont really need to worry about this to do this mod. The 1meg resistors are the ones in the plastic sleeve, in this pic you should be able to see where they terminate. You will see the existing ones in your unit there and simply just remove the old ones and put the new ones in. On this end you can see the two Blue 2.2kΩ resistors which are the next ones to do.... Yeah, its a little messy in there, I was swapping out so many resistors I made a bit of a mess which I need to tidy up, not a lot of room to move in there.... Ask questions, and most of all, enjoy!!