I think it pretty obvious that I have a passion for the Tannoy DC in all its guises(with the exception of the FSM which is a snarling dog imo!) what hasn't been clear is my secret passion for the JBL monitor sound. There's nothing quite like them and probably not a speaker built that rocks like a JBL can. A while ago I picked up some tired and jaded TM1 clones that had a bit of history being the monitors from Pluto sound studios in Stockport where they'd been on monitor duty for both (part of)the Smiths first album and Bankrobber by the Clash. This project came about after realising that my largish end terrace just wasn't big enough for some Westlake TM1 clones [I]and [B]Tannoy 215 clones[/B][/I]but it may be for some of the newer JBL monitors like the excellent 4338's [URL]http://www.jbl.com/home/products/product_detail.aspx?prod=000000000000004338&Language=ENG&Country=US,US&Region=&cat=BFS&ser=LSR[/URL] JBL publish Tech sheets with xover schematics/driver compliments, part numbers etc and it became clear that both JBL Pro and Consumer were using the same drivers across the top of the range models with the drivers having different model numbers in each area. The mid/hf is a relatively new neo magnet 3" compression driver 435 Be/2435 HPL or 435 Al/2431H and the UHF either a 045Be or the 045ti. [URL]http://www.jbl.com/home/technology3c.aspx?Language=ENG&Country=HA&Region=[/URL] The consumer variant mid/hf is 'dusted' with Aquaplas, a damping compound used widely by JBL in its flagship models. What these units aren't is cheap-the mids alone retail at 00 each with new dias a stonking 0. Another problem is sourcing horns that can work with these units-they need to go low-around 7-800 hz only cloned H9800 are available as JBl wont sell. In each case I got very lucky-though that did dictate the type of flagship model I was attempting to copy. As a variant of the horn used in the 4338-the 4338H forms the basis of the SAM1HF horn as used in the new Array series and is rotated 90'. These are SOTA Bi Radials molded in Sonoglass an acoustically inert resin and are far removed from bi-radials of old. The pro version of the mid hf can sometimes be sourced via eBay for a not unreasonable 0-400 but you do need to give them a good gap clean, recharge the ferrofluid and if you've the bottle dust them with Aquaplas.The UHF can only be sourced from JBL with the Be version 0 a pair-I opted for the ti(titanium) version a more modest 0. Anyway heres where I got lucky, I managed to source some perfect 2435HPL drivers via eBay and best of all a pair of very slightly dinged SAM1 HF horn flares free of charge from a JBL tech on the Lansing forum. So I was going to build a variant of the 1400 Array using the beryllium version mid/hf and the stock 045 titanium UHF driver on SAM 1HF horns mated to because I had 4 kicking around, the ubiquitous 2235 bass driver. The set up will be active bass rolled off at 750 hz and the passive network from the Array crossing at 750/8k. The stock network has been tweaked to get the best from these drivers so I'm cloning it. Over the next few days I'll post all the stuff I have so lets start with reconing the old and (arrrgghhhh)front refoamed AlNiCo 2231a to 2235: