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#131 | |
diyAudio Member
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![]() Quote:
AFAIK this tweeter needs a fairly complex crossover and thus not suitable for newbies.
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#132 | |
diyAudio Member
Join Date: May 2002
Location: Kimberley, South-Africa
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Quote:
![]() Deon
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#133 |
diyAudio Member
Join Date: May 2002
Location: Kimberley, South-Africa
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Hi guys
I just thought about something- has anyone considered the Fostex FT28D tweeter? It looks good, albeit a bit expensive. The specs in brief are as follows: Impedance 8 ohm Resonant frequency 850 Hz Bandwidht 1kHz÷50kHz Sensitivity 90 dB Music power 40 W Any one have any ideas\experience? Deon PS. Go here to download the complete spec sheet. It is in PDF format: Fostex FT28D Further Specifications
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#134 | |
frugal-phile(tm)
diyAudio Moderator
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![]() Quote:
dave
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#135 |
frugal-phile(tm)
diyAudio Moderator
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The D27 is an ideal tweeter because it's sensitivity is a very good match...
dave
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#136 | |
diyAudio Member
Join Date: May 2002
Location: Kimberley, South-Africa
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Hi Dave
Quote:
Deon
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#137 | |
frugal-phile(tm)
diyAudio Moderator
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Quote:
This is the accepted formula derived empirically from Olsen's graphs. Newer software BS smulators that take into account non-square baffles tend to predict a lower F3 yet. dave
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#138 | |
diyAudio Member
Join Date: May 2002
Location: Kimberley, South-Africa
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Hi Dave
Quote:
![]() ![]() That is the equation I was using. The f3 formula is: ![]() That is the equation you were using. My bad. Sorry. Deon
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#139 |
frugal-phile(tm)
diyAudio Moderator
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#140 |
Banned
Join Date: Feb 2003
Location: Jakarta
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Rabbitz,
Is the xo you sent to x. onasis copyrighted? ![]() x. onasis, I hope you'll come up with a good speaker so I will be motivated to buy the drivers. Currently I need a good looking small speaker to be used at office. I have a 6" local driver (called Tango) as a candidate. Not as detail and sweet as P13 but better dynamic and very low bass. I need one that work good in low SPL. The P13 is really sweet in midrange, and I feel that the midrange quality is very important for music enjoyment (when listening to vocals). But 5uF D27 could be a problem, especially when we expose the midrange quality as in small speakers. In floorstanders, we expose other qualities (transient, bass) that will make the problem with D27 become less important. The problem is not only the harsh sounding (like what coolkhoa is anticipating), which is true, but also the phase problem. For the harsh sounding problem, may be you can damp the chamber with wool. As I can remember, the D25 has qualities that better the D27 (to be match with P13, P17 or even several other drivers I have tried). But that is just my opinion. I really don't think that P17 is a better option than P13. If you insist a P17 project, it should be a high power teenager system with a lot of (not so low) bass, a floorstander. I think EROS is the best implementation available on the net. And there are also many other implementations (John K's for example) so building a completely new design is not supposed to be done by newbies. If you want another project using P17 and D27 (called the Pilotis), I think I can send you the xo information (this one is not on the net). This speaker is popular here, and seems many here can live long with it. Coolkhoa, It is sure that the D27 will be harsh sounding with only one cap (even with second order accoustically). The problem is to find out how important or critical it is. With P13, no matter where you cross it, it will still be sweet. But I usually search a point where the driver produce the most natural sound (sweet doesn't mean natural), and it is usually lower than what creates "sweet" sound. IMO, the natural sound will be produced if the driver mechanics (cone etc) doesn't introduce their own sound, and so the sound must not be heard coming from the driver. Dual P13 in MTM? That's the Ariel. I usually against double woofer, but P13 is very good at mid with the compensation of weak bass. IMO, the best choiche to expose a bass is by means of a good enclosure. But I think I have never seen a small MTM like Froy/Odin/Gemini. That will be an interesting project. Jay. |
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