I would really like to know how the SEAS 22TFF H1280-06 would do in a waveguide.
For a tweeter that cheap it measures very well indeed but on its own it has an annoying treble boost of a few dB which may actually be an advantage once waveguided.
The only problem is that I guess I'd have to post one to you and then cost escalates dramatically and I might as well just spend the money on XT25s like SpinMonsters or D2608s.
I decided against the ZA14. I eventually used the 6.5" Silver Flute to go with the WG. In the Canary-II, I brought the crossover down to 2kHz. Absolutely no issues with distortion.
I'm planning to replace the SF with the Peerless 830874. I'm quite sure the Peerless will outperform the SF.
Is that electrical or acoustic? MFG specs 1.5kHz, several reviews claimed the same. Looks like some sats I built some 30 years ago
Your lucky day kind of . I just finished up last night testing the 22TAF/G and the 27TBC/G
The 27TBC/G did fantastic leaving the faceplate on, which it is not removable the way the terminals are attached. It worked well in every shape guide I tried.
https://picasaweb.google.com/101632266659473725850/Seas27TBCG
The 22TAF/G had an issue with a dip at 12kHz on axis. it was not bad at 10 degrees and gone by 20 degrees. I was able to remove it putting a 1/2 round by 1/16" piece of felt on the screen but it also attenuated the top end by about 4 dbs. I was able to remove the screen but the dome is recessed below the surround. I can usually get rid of the dip by reducing the throat size but I need to get close to the dome. In this case I would have to put the guide below the face of the surround to get close enough and that just does not give good results.
These measurements are all with phase plug except the last one.
https://picasaweb.google.com/101632266659473725850/Seas22TAFG
Dave
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Thanks for pointing that out. I forget that Picasa defaults to private settings when I put up a new album. I need to change them to public. Should be working now.
Dave
Dave, I think the reason the 27TBC/G looks so good is because it supports a phase plate. Its just a clear flexible round polymer adhered to the hexagrid but it performs the same function for dispersion as the XT25's phase plug. In a waveguide it would do the same thing as the XT25. I like the combination.
The TBFC/G looks to be the newer model but otherwise the same.
The TBFC/G looks to be the newer model but otherwise the same.
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I modded it to ER18DXT 5 years ago, this is vague... I really liked it's bass and treble! Perhaps it was a little sharper in many ways than ER. Room measurement showed some dipping around 2kHz. I still have the REW measurements but they were done with a laptop's built-in mic.
I had messed the phases of W and T and had lots of trouble trying to figure out when everything was right for both. Then MarkK introduced his ER18DXT and I made a swap in november 2007 - I guess I was one of the first! I used the box of L18 with offset tweeter and chamfered box edges.
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A flashback to Amphion Helium2 - Greebster was right! It has LR4 at 1,5kHz.
My speaker came with wrong polarity, just like the one measured by Stereophile! I don't know if it was some batch or all of them, I couldn't find anything about it at Finnish forums. The red wire was attached to woofer's plus. I inverted it and took new measurements.
Another peculiar feature of it is the rear port's noise at 800Hz. The supplied plug reduces it 10dB and blocks reflex. The port makes the hickup at 800Hz seen in my measurements! hickup at 150Hz is the ceiling and at 400Hz the floor.
My speaker came with wrong polarity, just like the one measured by Stereophile! I don't know if it was some batch or all of them, I couldn't find anything about it at Finnish forums. The red wire was attached to woofer's plus. I inverted it and took new measurements.
Another peculiar feature of it is the rear port's noise at 800Hz. The supplied plug reduces it 10dB and blocks reflex. The port makes the hickup at 800Hz seen in my measurements! hickup at 150Hz is the ceiling and at 400Hz the floor.
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The guides for the 27TBC/G are the same guides as the 22TFC/G but uses a different size mounting plate. The diaphragm sizes are different but the diameter of the surrounds are the same. Fitting tight around the protective screen requires a 1-9/16" throat size for both.
If I had to guess if the 27TDFC would fit probably. Would it perform well I would guess not. I usually do not get that good of a top end on a tweeter when fitting the guide around the surround especially over the face plate. I was surprised the 27TBC/G did so well. I'm assuming it has to do with the flatter aluminum dome.
Dave
When I saw that and noticed the 22TAF did not have one and had the dip at 12kHz that's when I started experimenting with it. I tried the clear shield on the inside and it did not do much at all. Same thing on the outside. Interestingly the felt tip the same diameter 1/16" thick on the outside of the mesh screen removed the dip but also attenuated the 15-20kHz by about 4 dbs. I tried different sizes and shapes and none was as good. I tried a few different size cylinders on top of the felt and a 1/4" diameter by 3/8" tall cylinder boosted the top end back up but the 12kHz stayed the same creating a dip again. I tried the cylinder alone and it made no improvement.
In my experience when I've experimented with phase plugs it really doesn't fix the problem but can help. I'm not sure it's really worth the effort. I'm not sure you could hear the dip at 12kHz anyway. It is gone at 20 degrees off axis. I think it's more of a visual thing if you see it you think there is a problem. This is just my opinion. Since I can only hear up to about that point anyway.
Dave
Megaton, Czech production, comprises horns and waveguides, made of aluminium and they publish their own measures
eShop | prodance.cz
Only case I know of a 2" waveguide - see their C9090 (similar to the round Dayton mentioned in the beginning of the thread but 2"). Does anyone know of further 2" waveguides ?
eShop | prodance.cz
Only case I know of a 2" waveguide - see their C9090 (similar to the round Dayton mentioned in the beginning of the thread but 2"). Does anyone know of further 2" waveguides ?
They have some interesting shaped horns
Looking at the finish they appear to be molded in the Isengard
Nevertheless I like them. Remains me from the old days when 'high tech' was measured in kilograms
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Only thing with Prodance is that ordering can be difficult due to linguistic problem. A friend of mine who has regular dealings in CZ will bring me back some C9090. The prices are more than OK too and BTW, they also have some JBL "inspired" horns...
Yes, they do look a bit rough but as long as the thread hole is OK...Anyway, I've seen articles about comparions made in the 1980s/1990s, between rough surfaces and smooth surfaces inside horns. The former was said to be advantageous in many cases. One can still polish the bits one dislikes, I guess.
Yes, they do look a bit rough but as long as the thread hole is OK...Anyway, I've seen articles about comparions made in the 1980s/1990s, between rough surfaces and smooth surfaces inside horns. The former was said to be advantageous in many cases. One can still polish the bits one dislikes, I guess.