Tannoy Royal Monitors.

[whitelabrat]

The wife is giving me the whole day to work on audio projects. Subject number one for today is a pair of Tannoy Royal Monitors (15' HPDs). They need new surrounds and the HF driver needs adjustment.

The HPD's are common but you don't see many with the blue magnet cover.

[Pano]

Pretty!
You're doing the rebuild?

[Speedysteve7]

Great! Can we look forward to more pics as you progress?
I may well have that job ahead of me in the near'ish future...

[rdf]

Sweet drivers. And nice phone.

[Charles Darwin]

I think the Royals were specific for the canadian market, the blue magnet cover is the only difference.
Since they need new surounds you could recone them with Monitor Gold cones which makes them identical to Golds with the exception of vastly increased power handling due to more modern glue and formers. If I remember correctly they will take 350wrms after a recone.

[whitelabrat]

I've adjusted the HF driver. Maybe it is me, but they seem a bit peaked in the high-mids. Apparently I've got dog like hearing because I'm not getting the very high frequencies I was hoping for. Perhaps this calls for a super tweeter? Otherwise adjustment wasn't as hard as I expected. Now for replacing the surrounds.

I believe these were purchased second-hand from a Canadian. Furthermore they are mounted in large infinite baffle cabinents. I'm tempted to leave out the crossover to make an impromptu rear firing port, but the bass is already pretty wild on these guys.

I don't like new phones. The one on my desk is an old Kellogg ITT I think. In the kitchen I've got a nice Western Electric wall mount that is the same era as the desk phone. They outlasted their owners and will probably outlast me too.

[whitelabrat]

I've removed the brackets that fit on top of the surrounds.

[whitelabrat]

From the speakerbits instructions (very detailed) I have to remove the spider to remove the cone. Problem is the screws for the spider are covered by the magnet. So I removed one magnet. Take note that these are very powerful magnets. Keep anything remotely magnetic away. Otherwise some significant effort may be needed to separate things.

I apparently made a not so great decision. The screws are a wimpy aluminum or zinc and I sheered one off. I think they are supposed to be removed from the nut side instead. I think it is salvageable so I'll keep moving.

[whitelabrat]

I'm a bit concerned by one of the voice coils. Kinda dark with bluish tint. I suspect the other has been reconed

[DcibeL]

The enamel is a bit cooked there. If you connect a multimeter you'll know if it's shorted or not, that is assuming you haven't tested the drivers to see if they work.

If the measurements check out, it's probably still okay, however the extreme high voltage resistance that the enamel once carried is likely lost, however that shouldn't be much of a problem for a loudspeaker. If you run your fingernail along the voicecoil and the enamel flakes off, then you're in trouble.

I would also be worried if the magnets in these are AlNiCo, as they loose their charge if the speaker is horribly overdriven.