Recent content by martinclan

Well they are finished other than the grille. Mind you they look pretty good as they are, hmmm.... I did a brief test today with an original vinyl copy of Tubular Bells. The definition is amazing - I swear i could hear Mike Oldfield breathing on the section with classical guitar. A couple of...

Interesting remark about MDF. It certainly isn't what it used to be. I used recycled MDF from a couple of old speakers I built 20 odd years ago. It's completely different to the modern stuff. Heavier ( higher density I guess) and with a much better surface finish. Fings ain't wot they used to be!

To be honest I am not sure my hearing is accute enough to notice! But if it proves to be a problem I will probably do something like that which was used in the later JR149 as mentioned by Tony L. I am afraid the modern grille-less loook isn't compatible with active grandchildren. I already had...

I made some more progress. Finally decided to make the tops and bottoms from MDF, recycled from my defunct Daline speakers made over 20 years ago. Compared to "modern" MDF it is much denser and has a better surface so I am going to spray paint them rather than use a veneer. I have routed out a...

Six of one and half a dozen of the other as the say. The main problem being that the hole for the woofer is (relatively) very big and I was worried it would weaken the sheet of alumnium too much before I bent it. The bending required a considerable amount of force! As it happens probably the...

I finally succeded in making some acceptable tubes. Still not 100% perfect but they should do the job and, anyway, won't be seen once the grill is in place. tubes by Robin Martin, on Flickr Now - on to the woodwork!

Progress is made. I have built the crossovers. A lightly modified version of that used in the Monacor LS 5/19 as previously mentioned. And before anyone comments I know the enclosure I am building is different to the Monacor LS 5/19 and will therefore have an effect on the crossover behavior...

It looks like the primary is made from two windings. For 240v they are connected is series. For 120v they are connected in parallel. It's a fairly common arrangement. Cheers Robin

Before I put my hand deep in my pocket to buy the drive units and crossover components I thought I had better check that I can actually make the metalwork for the cabinet. It's a bit rough and ready but it'll do as a proof of concept. The actual ones I will make that will end up in my lounge...

To be honest I don't remember where the crossover circuit came from. It was either from one of the several links that have been added to this thread or I may have Googled it. Anyway I made sure I took a copy of the image....

Thanks for that S-Man. Where did you find the review may I ask? I haven't been able to find it although that's probably due to the fact I guess the original was in German.

I am leaning towards the Monacor SPH-145HQ / DT-19SU combination. Apart from anything else there is a crossover design avaviable. But it's this I really need some help with - some elements of it I understand and others I don't. I should say at this point I was, many years ago, an electronics...

Good question... Today my prefrence is to use a modern and better driver pair. But still not really made the final decision yet.

Hmm - that looks interesting. Unfortunately the tweeter (Monacor DT-19SU) doesn't seem to be available in the UK. The bass/midrange (SPH-145HQ) seems to be available from Wilmslow. I guessed at 2mm from the only picture I have seen of a dissasembled JR149. If anyone knows any better please let...

Thanks for all the input guys. I understand at least some of it.... Good points made about using modern drivers and that interesting thread on DIY audio. I have started the ball rolling discussing with a friend of mine, who is a sheet metal artisan, the construction of the alluminium D shaped...