Hale Revelation

[sucks2beme]

Ok smart guys. I've got a problem. I've got a pair of Revelation ones
that need new grill cloth. The grill is described as "non-removable.
I assume I'm going to need to use my imagination on this one.

[GV#27]

By chance is the cloth held in place by a rubber band that sits into a goove around the outside edge of the baffle ?

[WilliamM2]

Since you are replacing the cloth anyways, cut some of it out. It should be easy then to figure out how they installed it.

[sucks2beme]

I'll be pulling off one soon to look. I think the cloth was attached to the back of the wood frame in front, then the frame glued on the front of the speaker. I was planning to try using a window screen type vinyl spline around the outside of the front frame(there is a small seam). I will get some close up shots.
You can see the 1/8th inch gap around the front on the stock photo on the right.
They seem to sound pretty good. They have a warmer sound than I expected from the one review I saw on them.

[RuSsMaN]

Cool speaker.

[GV#27]

Hales designed a number of great speakers but for some reason he couldn't seem to stay in buisness even after 2 or 3 tries.

[GV#27]

I think the cloth was attached to the back of the wood frame in front, then the frame glued on the front of the speaker.

That would make replacing a driver (should it fail )a nightmare,can't believe they would have done that.

[sucks2beme]

That would make replacing a driver (should it fail )a nightmare,can't believe they would have done that.

I believe they were trying to prevent the problems that come from
the front grille rattling. The drivers are known to be pretty durable.
A screen window or Linn style replacement seems to be in order.

[sucks2beme]

Cool speaker.

They came from a pawn shop. They took a beating on them.
They had been sitting there for over a year. They also had a pair
of NHT2.5's missing the front grilles.

[GV#27]

The drivers are known to be pretty durable.

Yes their the popular and proven Vifa D25 and W17 's that dozens of designers used in the day,but accidents happen:D.Are you sure that there isn't some sort of friction fit like a rubber band holding the grille in that 1/8' groove?

[sucks2beme]

Yes their the popular and proven Vifa D25 and W17 's that dozens of designers used in the day,but accidents happen:D.Are you sure that there isn't some sort of friction fit like a rubber band holding the grille in that 1/8' groove?

I'll find out on Monday. I have them stashed out of sight for now.;)

[RuSsMaN]

How did the 2.5's look?

[sucks2beme]

How did the 2.5's look?

Pretty good. They need front grills(missing). About $60 from NHT new.
I don't remember if the feet were on them. $250 out the door at
Cash America Pawn on Midway and 635. I went to look at these, and the
manager showed me the NHTs. Sometimes this shop gets some interesting stuff.
They've also got a NAD 730 receiver. Good bedroom rig. I really wasn't up for
the NHT's but I know you were. I didn't have time to pull them out and really
look them over well.

[sucks2beme]

Well, that was different. I pulled off one of the cloths. It's a nicely stitched
cloth over a very common looking small rubber braid used in window screening.
The corners are stitched, and the edges are rolled over and stitched around the
rubber braid. Some careful measurements are in order. After I figure out how to sew, i
t's just a case of tucking back in the rubber braid/cloth.
I hope a standard window screen roller tool works for this.

[GV#27]

Yep figured that it would be a rubber band type arangement.

[sucks2beme]

Well, something's wrong. Sounds muddy. I pulled the drivers on one to make sure they were original. They were. But this is a very od xover. Homebrew?
Or typical of small scale speker makers? I will have to go through it when I
get a chance.

[GV#27]

Well, something's wrong. Sounds muddy. I pulled the drivers on one to make sure they were original.

Hummm these shouldn't sound muddy unless perhaps the tweeters output is low or their damaged. Are the tweeters actually working?Replacement diaphrams are still available for those tweets approx $15 each.

But this is a very od xover. Homebrew?
Or typical of small scale speaker makers?

Most likely stock as some manufacters prefer to use point to point wiring instead of circuit boards.I have seen the xovers of some PSB,s Snells and Theils of that era (mid-late 90's)that used similar contruction techniqes.The parts quality looks very good with air core coils and mostly film caps.Looks like they even tested and labeled the value of caps for pair matching.

[ShinAce]

Would you mind sketching the crossover for me. I don't even need the part values at first. Just curious to see what part is the crossover(2-way /12dB on both sides?) and which is compensation(zobel?).

Make sure the phase on all speakers and drivers is correct for now. Maybe you're not the first to open them up.

[GV#27]

Just curious to see what part is the crossover(2-way /12dB on both sides?) and which is compensation(zobel?).

Yes it looks like 12 db electrical filters in both the tweet and woofer sections ,but the actual final acoustical slope is likely 24 db per octave when the drivers natural rolloffs are factored in. (Hales usually used 4th order Linkwitz Riley xovers in his designs).The blue electrolytic cap, .5 mh coil and 1.5 ohm resistor appear to be an LCR notch type filter for the woofer ,not a zobel.

[GV#27]

1.5 ohm resistor.

I read it wrong,upon closer inspection its impossible to see the actual value of that resistor in the pic.