NCD - a derelict Sunn project.

[itu]

125 W - 250 W - 500 W - 1 kW 

 

There's a 3 dB step everytime you double the power. Most likely this will be in the 8 dB area, which is quite a lot. If the drivers are more sensitive than the originals, the change will be even more, maybe 10 - 12 dB. And that is a lot. 

[Jackroadkill]

1 minute ago, itu said:

125 W - 250 W - 500 W - 1 kW 

 

There's a 3 dB step everytime you double the power. Most likely this will be in the 8 dB area, which is quite a lot. If the drivers are more sensitive than the originals, the change will be even more, maybe 10 - 12 dB. And that is a lot. 

 

Crucially, the new drivers will not be blown, either!

[Downunderwonder]

9 hours ago, Jackroadkill said:

 

Crucially, the new drivers will not be blown, either!

I would still exercise caution with the 500W Ampeg and the bass knob. You might not be able to melt them but 250W per driver is still a fair poke in the ribs if it's bass heavy.

[Jackroadkill]

Right, the new speakers are here and I've degunked the internals of the cabinet in preparation for fitting them.  Whilst doing this I looked at the cabling and wondered if it's going to be up to the job or potentially going to melt under the workload.  It wouldn't be a big job to replace the existing wiring with some heavier-duty copper, after all, so I may well invest in some for this project.  What do the BC hive mind think?

 

Once it's all together I'll get the Tolex cleaned up; the grille cloth is also disgusting (it's had 40 years - minimum - of spit, beer and bodily fluilds rained down upon it, so that's coming to work for a pressure wash and trauma counselling before it goes back on.

 

 

Side by side comparison.

 

 

 

A (nearly) clean interior; whatever has caused the splashes in the bottom port isn't keen on coming off with water and elbow grease so I may have to get a bit medieval on it.

 

 

 

This is the wiring; do we reckon it's up to the task?  

 

 

 

800w each at peak power should be enough....  Sprung connectors, though.  I might need to do something about those to ensure that the wiring stays attached.

 

So, things are coming on, and hopefully I can get the drivers (which actually fit in the holes cut in the baffle!) fitted soon.

 

Cheers,

 

JRK

[Bill Fitzmaurice]

1 hour ago, Jackroadkill said:

 This is the wiring; do we reckon it's up to the task?  

It's far larger than the wire in the voice coils. 😎

[Jackroadkill]

11 minutes ago, Bill Fitzmaurice said:

It's far larger than the wire in the voice coils. 😎

Ha, yeah, I didn't think of that..!

[Bill Fitzmaurice]

Neither do audiophools who spend a fortune on oversized cables that don't do anything other than depleting their bank accounts. 😉

[Richard R]

Nothing useful to add, just following with interest.

🙂

[Jackroadkill]

42 minutes ago, Richard R said:

Nothing useful to add, just following with interest.

🙂

 

No worries, Richard; I was hoping to have something more exciting to show you by this evening but have encountered issues with my soldering iron (as in, it's knackered) and so I've had to order another.

 

I have, however, come up with a plan for the connection of the drivers - tin the cables up, run them through the spring connectors and then heat-shrink them (carefully) into place.

 

Cheers,

 

JRK