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firebird caps

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Posted on August 17, 2011 at 18:59:44
falcoron
Audiophile

Posts: 10
Joined: August 8, 2011
 The fire bird has a single cap to protect the tweeter which is wired out of fase with the wide band, why is this wired so and what is the value of the cap? i assume its a 1uf 50v, will different value caps give a different sound? If so what would do what? sorry im very new to all this.
I have a few mundorf caps 1.25uf to 2uf some are 50v and some 630v what would i get if i change the cap or is that not advisable?

 

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RE: firebird caps, posted on August 21, 2011 at 08:44:28
Robert Bastani
Manufacturer

Posts: 245
Location: Germany
Joined: November 12, 2004
 Hi,

the cap of the Firebird`s tweeter are wired out of phase related to the widebands because by this method the drivers act in- phase in the crossover- region. The areas of the wideband drivers cones and the areas on the tweeters where the sound comes from in the crossover- region show different distances to the listener and the inverted phase of the tweeters brings the tweeter back in phase with the wideband driver.
The Firebirds come with Bastanis caps for Firebird, the value is 1,8uF. This is the right value, other values will give different crossover- points.

Regards,
Robert Bastani




 

RE: firebird caps, posted on August 22, 2011 at 01:43:16
falcoron
Audiophile

Posts: 10
Joined: August 8, 2011
 Thanks Robert,
So that is the only crossover componemt in the firebirds?
Really interested in these just wanted a bit of info how you made these up and what was used with the drivers and tweeter to smooth out the crossover between the 2. Out of interest What is the frequency range of your 10" drivers
And with your 1.8uf cap when would the tweeter take over? I think this design is fantastic and takes a lot of hard calculations out.
That tweeter looks very nice too. Did you position it between the drivers for any particular reason as most tweeters would be at ear level.
Thanks

 

RE: firebird caps, posted on August 22, 2011 at 12:02:16
Robert Bastani
Manufacturer

Posts: 245
Location: Germany
Joined: November 12, 2004
 Hi,

the tweeter caps are the only parts in series. There are also paralleled resistors to flatten the wideband drivers impedance.
For the smaller 10" wideband drivers i use similar methods as for the 12" Mandala wideband drivers to treat the cones. This treatments mainly make the cone more flexible and increase the self- damping. When the treatments are done the cones break up early and work as flex- cones to higher frequencies. The resonance- behaviour is very good and the wideband drivers show a proper self roll- off to higher frequencies, so no additional crossover is required and the drivers are direct- coupled to the power- amp.

The tweeter is 8 Ohms.
The tweeter is positioned below the wideband driver, this anglinement produces an upward axxis, so the bigger the listening- distance the more the imaging rises in height - the Firebird design works best for a listening- distance between about 2m and about 5m (depending on the height of your ears in listening- position).

Regards,
Robert Bastani




 

RE: firebird caps, posted on August 22, 2011 at 14:46:18
falcoron
Audiophile

Posts: 10
Joined: August 8, 2011
 Thanks again Robert.
I saw a pair of firebirds last year and noticed the white rectangular item on the full range and wondered what it was. So that is a resistor soldered onto the + and - of the driver? never saw that on any speaker before ,but then again yours are not any speaker LOL!
have to appologise im not very technical, what is the value of the resistor and what does that value do to the driver, you say it flattens the impedence, what does that mean?
Sorry for the questions but would like to know the csience behind your design, im facinated by these. Hpoe you dont mind
Thanks

 

RE: firebird caps, posted on August 24, 2011 at 10:53:44
Robert Bastani
Manufacturer

Posts: 245
Location: Germany
Joined: November 12, 2004
 Hi,

thank you for your warm words!
Beside the methods to make the wideband drivers able to climb to higher frequencies and show a proper self roll- off without any crossover- parts the Bastanis speakers follow a simple design- philosophy based on wellknown physics - keep everything as simple as possible and do everything in highest possible standards.
Many parts do different jobs, so for example the paralleled resistors (between plus and minus)flatten the impedance which is recommended for tubed amps.
Second the resistors avoid non- linearities inbetween the series- wired drivers on the Atlas- style open baffles (two wideband drivers per side). The third is that the resistors take away some energy in the upper midrange to help the drivers producing a flat amplitude.
The more simple a design, the less number the parts, the more complexed are any changes and the more important is the quality of any part.

Regards,
Robert Bastani

 

RE: firebird caps, posted on August 24, 2011 at 12:04:09
falcoron
Audiophile

Posts: 10
Joined: August 8, 2011
 Thanks again Robert,
very informative, can i buy these caps resistors from you?
As ive said previously i have a few caps some paper in wax and paper and oil from mundorf, obbligato and audionote i even have the 1.8uf needed.
im sure yours are exceptional quality.
if you can sell me these i would be gratefull as i have just purchased a pair of big funs but these were stripped down to the drivers and tweeters as the seller would not post the box and i didnt want it anyway. So i have the 10" bastanis drivers and the magnostatic tweets but the resistors, caps and wiring are missing.I have a pair of eminence 18" omega's for the bass and am looking now for a sub amp to drive them.
i will drive the mids and tweeters with mt Hyperion HT88se mono blocks.
hope you can accomodate and if this goes well i'll be in the market for the big bastanis OB's next! cant wait.
Thanks for your help,

 

RE: firebird caps, posted on August 29, 2011 at 22:47:42
Robert Bastani
Manufacturer

Posts: 245
Location: Germany
Joined: November 12, 2004
 Hi,

the combination with your monoblock power- amps and the widebands is harmonic.
I can send you all the missing parts, please mail me your adress and some details about your room thru my website, i`ll give you advice how to make the baffle and the in- room placement in the best possible way.

Regards,
Robert Bastani


 

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