Definitely been modified by a past owner. I assume to bi-wire (ugh), so I’d expect to find some cut traces etc on the back of the circuit board. The puzzling thing is the layout of the terminals, e.g. no indication as to which are paired. I’d be inclined to pop the circuit board out and have a look at the other side and try and figure out exactly what has been done. At that point you can make a decision as to whether to try and reverse the mods out or live with them.
PS I’m astonished anyone would embark on a mod like that without first recapping them!
Just had a quick look. According to the schematic the resistor closest to to tweeter trimpot should be 4R7. Most JR149 crossovers I've seen pictured including the linked pair have 5R6 in this position. My current pair SN99** which are also the earlier fuseless type are one of the few I've seen that actually have the correct (according to the schematic) 4R7 resistor in this position. All the other resistors in the linked pair are correct (again, according to the schematic).Yes, I spotted those and was close to flagging them in the interesting eBay auctions room. They look like a very early gold-logo pair and again give some clues as to the ongoing development as they have the front-baffle deadsheet and foam, but have the original fuseless crossovers. The ‘tropical fish’ caps are interesting and I’ve seen those used before. They look totally stock to my eyes and in very nice condition. It would be interesting to know the resistor values and whether they match the schematic.
Here is a pic of the crossover off my current JR149s before I replaced the caps & resistors. Interestingly the 4R7 resistor nearest the trimpot has a different colour body to the rest so whether it's original or not is anyones guess. I just replaced like for like with the values.The schematic may well not be correct. It is just something I found on the internet so may just represent one pair of JR149s. I have no connection to it.
Anyone any guesses as to what that resistor value change would have subjectively?
Probably doesn't matter if it's 4R7 or 5R6. VR1 will most likely be able to compensate for either.
That’s an interesting observation, and might go some way to explain why quite large variations of setting are seen in the wild.
There was a bit of a mix up with the foams. They looked great, but were cut to a depth of 18mm instead of the 12mm I requested and therefore protruded out beyond the wooden end caps by about 6mm and made the speakers look a bit tubby!Graham sent me these pics of my freshly-made bespoke JR149 mk2 grille foams today. I hope they look as good in the flesh as they do in the photos! I should have them by middle of next week.
Have you thought about adding a rug? It would really tie the room together.
Just a note to say that the brackets work really well in this position, presumably because the alcoves are giving them enough air behind. It’s a neat solution, I’m very pleased.