I've got a open baffle build going based on the JE Labs plans and using a 12" Celestion K12H-200TC full range which goes up to about 10k Hz. Overall they sound lovely but a bit on the dark side and lacking the air of my other speakers.
I'm looking for a nice tweeter to pair with the Celestion to fill in the upper active.
Right now I'm looking at some bullet and AMT type tweeters that would sit above the baffle. The Fostex T90A is appealing but out of my price range. The Eminence ASD1001 is also appealing for the price but would I'm not sure which horn would be good to pair with.
I'd love to hear what other have used and had success with.
I'm looking for a nice tweeter to pair with the Celestion to fill in the upper active.
Right now I'm looking at some bullet and AMT type tweeters that would sit above the baffle. The Fostex T90A is appealing but out of my price range. The Eminence ASD1001 is also appealing for the price but would I'm not sure which horn would be good to pair with.
I'd love to hear what other have used and had success with.
"It's what's up front that counts."
Purchase a 90x40 SEOS waveguide clone and a low cost 1" compression driver. This should give you a good front sound stage. You can experiment with removing the rear cap off of the compression driver as in Bastansis, or adding a 1" dome tweeter in the rear for ambience fill.
Dayton Audio H6512 6-1/2" x 12" Waveguide 1-3/8"- 18 TPI
Select a low cost 1" compression driver with a proven diy crossover circuit.
Either Plastic diaphragm, or a coated Titanium diaphragm.
Dayton Audio DT250P-8 1" Polyimide Compression Horn Driver 1-3/8"-18 TPI 8 Ohm
Peerless by Tymphany DFM-2535R00-08 1" Coated Titanium (also screw in)
Pyle PDS442 1" Titanium with plastic suspension
Purchase a 90x40 SEOS waveguide clone and a low cost 1" compression driver. This should give you a good front sound stage. You can experiment with removing the rear cap off of the compression driver as in Bastansis, or adding a 1" dome tweeter in the rear for ambience fill.
Dayton Audio H6512 6-1/2" x 12" Waveguide 1-3/8"- 18 TPI
Select a low cost 1" compression driver with a proven diy crossover circuit.
Either Plastic diaphragm, or a coated Titanium diaphragm.
Dayton Audio DT250P-8 1" Polyimide Compression Horn Driver 1-3/8"-18 TPI 8 Ohm
Peerless by Tymphany DFM-2535R00-08 1" Coated Titanium (also screw in)
Pyle PDS442 1" Titanium with plastic suspension
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Compression driver ? Who needs >100 dB efficiency when OB "sucks" more than 10 dB in the bass compartment ?
If it's active filtering, well, it's another matter 🙄
Since you only need a tweeter above 10kHz I recommend a much smaller waveguide than the SEOS (which I believe was designed to work down to 900Hz).
The suggestion to use an inexpensive compression driver is a good idea because they are highly efficient to match the 12" driver you are using (which is rated above 95db per watt).
Consider Dayton Audio H45E 4.5" x 4.5" Elliptical Waveguide 1-3/8"- 18 TPI or someting this small.
Drivers to consider could be
Eminence APT-50 Super Tweeter Horn Driver
PRV Audio DT175Ph-S 1" Phenolic Horn Driver 8 Ohm 1-3/8"-18
Eminence ASD1001 1" HF Titanium Horn Driver 1-3/8"-18 TPI
Or even this one for an all Celestion speaker:
Celestion CDX1-1010 1" 20 Watt Compression Driver 1-3/8"-18 TPI 8 Ohm
Or you can choose from any number of bullet tweeters or even the least expensive Fostex horn tweeter.
The larger Dayton waveguide, like the SEOS, is not a good solution for a super tweeter for your design and are really designed to bring the frequency response of a compression driver lower to match up with a 10 or 12 inch woofer that is not 'full range' like the driver you are using.
The suggestion to use an inexpensive compression driver is a good idea because they are highly efficient to match the 12" driver you are using (which is rated above 95db per watt).
Consider Dayton Audio H45E 4.5" x 4.5" Elliptical Waveguide 1-3/8"- 18 TPI or someting this small.
Drivers to consider could be
Eminence APT-50 Super Tweeter Horn Driver
PRV Audio DT175Ph-S 1" Phenolic Horn Driver 8 Ohm 1-3/8"-18
Eminence ASD1001 1" HF Titanium Horn Driver 1-3/8"-18 TPI
Or even this one for an all Celestion speaker:
Celestion CDX1-1010 1" 20 Watt Compression Driver 1-3/8"-18 TPI 8 Ohm
Or you can choose from any number of bullet tweeters or even the least expensive Fostex horn tweeter.
The larger Dayton waveguide, like the SEOS, is not a good solution for a super tweeter for your design and are really designed to bring the frequency response of a compression driver lower to match up with a 10 or 12 inch woofer that is not 'full range' like the driver you are using.
Thanks for the suggestions!
I like the idea of keeping with Celestion, and was looking to see if they made a usable bullet tweeter.
Is there a guide to selecting a capacitor value needed to achieve the crossover point?
I like the idea of keeping with Celestion, and was looking to see if they made a usable bullet tweeter.
Is there a guide to selecting a capacitor value needed to achieve the crossover point?
Based upon the Celestion K12H-200TC polar measurements
1.3kHz +/- 70 degrees polar
2.6kHz +/- 40 degrees polar
5.0kHz +/-20 degrees polar
(1) I first (WRONGLY) assumed that you desired a wider, yet well controlled polar pattern so more than one listener would get uniform power and sound stage using dipole bass and midrange, plus controlled bandwidth monopole treble. I assumed that you were not satistifed with the limited quality and limited extension from a beaming whizzer cone.
A 90H * 40V waveguide could be crossed at 2.5kHz up to 3kHz. There are several dipole EconoWave designs. A move out of the "man cave" and into "family friendly" wide soundstage.
(2) A narrower 45H * 45V polar pattern horn could be crossed at 5kHz - 6Khz to the K12H-200TC to help maintain a more uniform power delivery to multiple listeners as the 12" Celestion beams. The severe whizzer "jump-in" at 5K (SPL plot) could be significantly attenuated and blended with the 45x45 horn tweeter.
(3) If you are satisfied with a narrow single listener polar pattern, a horn tweeter can be crossed in a 8kHz as the whizzer fades. From the SPL plot, the whizzer jumps-in at 5kHz and drops-out at 8kHz, so a 1st order crossover (cap/inductor) cannot produce a smooth SPL curve.
($150 Fostex FT96EX-2)
($30 Peerless H26TG45-06 DPL20)
The small horn can be "aimed" and "physically time adjusted" to one listener such that it can generate a similar narrow pattern as the whizzer fades. The FT96EX "beam" is typically well mixed within a 3-foot listening distance. Due to the whizzer, the on axis frequency response is still trebly. Both high and low frequency energy is equal but the high frequency energy is very directional and the low frequencies are spread around the room.
1.3kHz +/- 70 degrees polar
2.6kHz +/- 40 degrees polar
5.0kHz +/-20 degrees polar
(1) I first (WRONGLY) assumed that you desired a wider, yet well controlled polar pattern so more than one listener would get uniform power and sound stage using dipole bass and midrange, plus controlled bandwidth monopole treble. I assumed that you were not satistifed with the limited quality and limited extension from a beaming whizzer cone.
A 90H * 40V waveguide could be crossed at 2.5kHz up to 3kHz. There are several dipole EconoWave designs. A move out of the "man cave" and into "family friendly" wide soundstage.
(2) A narrower 45H * 45V polar pattern horn could be crossed at 5kHz - 6Khz to the K12H-200TC to help maintain a more uniform power delivery to multiple listeners as the 12" Celestion beams. The severe whizzer "jump-in" at 5K (SPL plot) could be significantly attenuated and blended with the 45x45 horn tweeter.
(3) If you are satisfied with a narrow single listener polar pattern, a horn tweeter can be crossed in a 8kHz as the whizzer fades. From the SPL plot, the whizzer jumps-in at 5kHz and drops-out at 8kHz, so a 1st order crossover (cap/inductor) cannot produce a smooth SPL curve.
($150 Fostex FT96EX-2)
($30 Peerless H26TG45-06 DPL20)
The small horn can be "aimed" and "physically time adjusted" to one listener such that it can generate a similar narrow pattern as the whizzer fades. The FT96EX "beam" is typically well mixed within a 3-foot listening distance. Due to the whizzer, the on axis frequency response is still trebly. Both high and low frequency energy is equal but the high frequency energy is very directional and the low frequencies are spread around the room.
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That's what I was thinking, too. If the crossover is done correctly, it would bring that 12" down to about 86dB/Watt.
But we don't know if it's filtered that way, so it might need a tweeter in the mid 90s to keep up.
LineSource, I just got the Pyle PDS442 and think it sounds better than the Eminence costing 4x more.
The crossover is set at 1600kHz... not sure the driver will be damaged but it shows no sign of stress, has clear, twinkly highs ... and I like it just fine. Using this with a low powered digital amp so I doubt I can blow it but I'm curious how reasonably low it can be crossed.
Anyone have any info on this tweeter. No frequency response anywhere online.
The crossover is set at 1600kHz... not sure the driver will be damaged but it shows no sign of stress, has clear, twinkly highs ... and I like it just fine. Using this with a low powered digital amp so I doubt I can blow it but I'm curious how reasonably low it can be crossed.
Anyone have any info on this tweeter. No frequency response anywhere online.
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