Realistic Nova 7b tweeter

[Commander 31]

I'm in the process of refinishing a set of realistic nova 7b speakers. As I was removing the tweeters I noticed the mesh surround on one set is sealed (like klh or AR) and the mesh surround on the other set is not sealed. Anyone know which is correct, sealed or not sealed? The sealed surrounds are much stiffer and have very little movement. The unsealed surrounds move freely.

Pictures attached.

 

[nerdorama]

Are they both the same part number on the rear?

 

[Commander 31]

Both sets of tweeters are 0705Ae 16 ohm. There's a second number printed on the back that's different.

Pictures attached.

 

[nerdorama]

The number 0705ae is the model number for them. Not sure what to suggest about the surrounds. They are probably ok as is since they won't need to move very much as tweeters. The should also be isolated in a subenclosure so they won't be affected by the woofers back pressure. I would use them as-is and only consider doing something if the sound is imbalanced. Can you make any acoustic measurements to see if they behave differently?

John

 

[Commander 31]

Yes, the tweeters are isolated in the plastic cones.

I had them connected to a pioneer sx-3700 for a couple weeks when I first got them. I did notice some difference in the higher frequency, but figured it may be the old crossover caps. I'll change the capacitors and get them back together and see how they sound.

I rebuilt a set of KLH 20s a few weeks ago and have some surround sealer left if needed on these 7b tweeters.

Thanks.

 

[nerdorama]

I checked a pair of similar tweeters I bought to repair my Nova 7's. They aren't the same p/n as yours but lookidentical otherwise. The surrounds are very open looking. I can see through them to the underlying metal structure. Maybe your darker one was coated by someone.

 

[Commander 31]

I can see through the unsealed surrounds also, the weave is open. It may be an excessive amount of glue on the other surrounds. Thanks for the information.

Tom.

 

[Bodyblue]

Here is shot of my 7B tweets. I am ordering the caps for them today. What do you think of yours so far? They rather blow me away with how smooth they are.

 

[Commander 31]

The speakers sound good, but the cabinets were not sealed around the corners so I'm looking forward to some improvement after I get them sealed up, recapped and refinished.

 

[Bodyblue]

The speakers sound good, but the cabinets were not sealed around the corners so I'm looking forward to some improvement after I get them sealed up, recapped and refinished.

The veneer on my was in rough shape but I got them presentable at least. In the corners of our bedroom, a 20 foot wall, the bass is tight and deep. The highs are what are blowing me away, especially in a 45 year old speaker. I only got mine yesterday. What caps are you going to use?

 

[Commander 31]

I've had good luck with the Dayton caps from Parts Express.

 

[Bodyblue]

I've had good luck with the Dayton caps from Parts Express.

So have I. I was thinking that since they only have one cap in them I would buy a bit better one but I doubt it will make any difference.