Hmm, Dayton RS28F - F??? What have we here?

[critofur]

What's this?

http://www.parts-express.com/pe/show...number=275-140



Interesting...

[Dirk]

Whoa. If that response graph is to be trusted, that's impressive. The response dip from the RS28A seems to be gone.

[charlielaub]

It looks to me that they moved the location of the dome forward, so that it projects above the face plate. That would explain the better response in the top octave shown in the graph. But that's just my guess. I would love to get these in my hands to test them!

-Charlie

[Pete Schumacher ®]

It looks to me that they moved the location of the dome forward, so that it projects above the face plate. That would explain the better response in the top octave shown in the graph. But that's just my guess. I would love to get these in my hands to test them!

-Charlie

Too bad the sensitivity took a hit.

Now, according to the spec sheet, both the RS28A and RS28F have 88dB/1W input, yet the RS28a spec sheet shows a 91dB sensitivity where the RS28F shows 88dB. I wonder if both are actually using 1W or if the RS28A is getting 2W for the chart on the PDF?

[shawn_a]

Very interesting indeed. Nothing like an Usher 9950 or 9930 dome. I might have to cabbage onto a pair of these to play around with. Dig through the sofa time I guess.

shawn

[gowa]

I guess its just me that is suspicious when there is no off axis measurement present. Don't you think that is an important part of measurements?

[shawn_a]

I guess its just me that is suspicious when there is no off axis measurement present. Don't you think that is an important part of measurements?

I'd sure like to see at the very least one off-axis plot. Be it 30 or 45 degrees but it would be a bit more telling.

shawn

[shawn_a]

I'll take a WAG that it's sharing quite a bit of DNA with an Usher 9950-20. The mesh grille was throwing me off for one thing. Comparing specs between the two, it's like the RS is a 4Ω version of my favorite tweeter. There are differences in their frequency response plots but I wonder if it has to do with possible differences in test baffles and such. Still this is a big honkin' blip on my radar now. Can't ignore it.

shawn

[gc1]

As usual, they don't have Force Factor, Xmax, and Mms specs... seems for that much money, one could get the basic specs!!

[charlielaub]

As usual, they don't have Force Factor, Xmax, and Mms specs... seems for that much money, one could get the basic specs!!

Although Xmax would be nice, the other specs that you mention are not really all that relevant for a tweeter... I too would like to see some off-axis response plots.

-Charlie

[rogoll]

As usual, they don't have Force Factor, Xmax, and Mms specs... seems for that much money, one could get the basic specs!!

That's what I was trying to get across in this thread http://techtalk.parts-express.com/sh...d.php?t=214110

But it seemed to be met with a good bit of disagreement.

[gc1]

That's what I was trying to get across in this thread http://techtalk.parts-express.com/sh...d.php?t=214110

But it seemed to be met with a good bit of disagreement.

I agree... BxL can be part of telling one what type of "dynamics" a driver has... Mms (and Fs) can tell one what type of "tone" to expect... and Xmax also dynamics.
Full "Q" specs would also be nice for tweeters... all these specs are important "guesstimations" about a tweeter's "tone", and output.

[Face]

I would never buy a mid or tweeter without off axis curves.

[gowa]

Yes, the reason I'm always suspicious when there is something basic missing is the fact we all know that the manufacturer tested for them. When there is something so basic as off axis missing, it just tells me there's something not quite right here. TB is notorious for this. You are hard pressed to find off axis measurements for anything they produce. That's why I never buy unless there are good graphs as a starting point or if someone I trust used the product and will give me an unbiased opinion. Sure slows the purchasing process.

[jclin4]

If you like (and can hear) extra sparkle, this might be an improvement. Otherwise the RS28A sounds pretty good, even with its 15k dip, does it not?

Also, a minor observation: the RS28F will be less kid-proof.

[Dirk]

The top octave response is governed by geometry. I don't see why it would be all that much different than any other 1.125" dome in terms of top end roll-off. Given that the tweeter seems to have a top octave rise, I bet it's pancake-flat 15 degrees off-axis.

[Dirk]

Also, a minor observation: the RS28F will be less kid-proof.

Why?

"Cast aluminum faceplate with protective mesh grill"

[PunkSweeper]

Unless there's a paper RS line coming out, I'd say this thing's a little cannibalistic for the Silkie.

On another note, I'm waiting for a ND28-A to come out to go with the smaller RS drivers and the re-branded Aura line Dayton is selling now.

[Dirk]

Unless there's a paper RS line coming out, I'd say this thing's a little cannibalistic for the Silkie.

So you're saying you'd pair this with a $10 paper cone 6.5" buyout woofer?

[jclin4]

Why?

"Cast aluminum faceplate with protective mesh grill"

oops, missed that. The curve on the mesh grille threw me off, I thought it was the silk dome itself. Thanks for clearing that up.