Fertin project - calling all open baffle experts

[planet10]

Originally posted by bcherry
Got to get one of those frequency test CD's to find out where we are.

This one i have found useful.

dave

[dice45]

Originally posted by bbaker6212
Please, please, please, keep the Fertin comments comming. .... ie, what speakers did you used to have, and how do the Fertins better them?

Brad,
this weekend i will make a listening comparison between the reference speakers i use for reality checks and my preliminary Fertin setup. I come back as soon as i have results.

Brian,
i use a similar amp, a #46 PP, even weaker than your #45 PP. I have my Fertins running at 12.9 Volts as the German dealer does. I found no reason to toy around with FC voltage yet, bass is lush and colourful and uncoloured as the midrange and treble. I agree, seamless and coherent is the right term to describe it.

Fertin makes 12" and 15" and even 18" fieldcoils. If i am as satisfied with the Beyma OB subwoofers, i may feel tempted to order 4 of those 18", the drivers are a bit more expensive than the 8".

[bbaker6212]

Dice, what are you using for the FC power supply?

[Peter Daniel]

You should better ask him what he's using for reference reality check speakers.

[Brett]

Bernhard,

Which model Beyma 18ërs are you using?

This is an interesting thread, and I'm getting lots of ideas from it. Whist I'm not really interested in buying the Fertins myself, not that I can afford them, I have some Goodmans 201s that will work in an OB arrangement. The Peerless 830500's that Linkwitz uses have similar-ish specs to my LABhorn drivers so might make an intersting experiment later.

Cheers all
Brett

[dice45]

Brett,
the Beymas are model 18" GT-200.
Er, recently i talked to someone having Goodmans. I described how my Fertins sound in detail, he asked, how much yield Goodmans on ebay? I am sure, he will crowd me soon to isten to me Fertins.

Peter,
when i post my Fertin/Gessner mini comparison, i will describe them a bit, this part of the post has already been prepared. I just did not find the time to do the listening.

Brad,
I am using an LT1085 series regulator with some stunts to get the ripple down before the reg. I mused about a shunt reg but such stuff is a serius challenge for inductive loads and i wanbted some swift result. Moreover, at 12.9V the poleplate is saturated already; hence it does not matter that much if the current thru the field coil is rock-solid constant. At 10V or 7V this may be another matter. To enforce constant current without using a shunt reg, i will try out a huge choke in series with the field coil.

[bcherry]

Came up recently in an AA thread:


http://users.starpower.net/je2a3/JELOBplan-1.jpg

Similar to ESL57 dimensions.

Discussed here:

http://users.starpower.net/je2a3/open.htm

where writer suggests that the relationship of the dimensions may be same concept as the golden mean used for speaker positioning in a room.

Brian

[dice45]

All,

the promised listening comparison has to wait. Today i tried out how the Fertin FC and my trusty old TT cooperate with shellac records.
, read my rave in the analogue board.

Stay tuned

[Brett]

Originally posted by dice45
Brett,
the Beymas are model 18" GT-200.
Er, recently i talked to someone having Goodmans. I described how my Fertins sound in detail, he asked, how much yield Goodmans on ebay? I am sure, he will crowd me soon to isten to me Fertins.

Bernhard,

Thanks for the Beyma model.

My 201's would fetch $US250 - 300 at best on eBay, less fees and Paypal, and a pair of Fertins are, what, $US1200+ / pair? Add duties, shipping etc and they are definitely <i>not</i> in my future. For me this idea was to see if anything could rival my horns.

Please let us know what the Goodman's owner thinks of your Fertins in relation to his Goodies.

Cheers
Brett

[reverendclark]

Bernhard,

I think I've got to do this. I've requested pricing from Fertin's agent. Is this the best way to go? Who is Black Forest and what do they have to offer?

Additionally, my best amps are probably 45 P-Ps, maybe the 45 Loftin-Whites, both at 2 watts. Is there any hope of being able to get good bass response without using a woofer? My experience is that there are such integration problems with offsets, etc. that it's not worth the trouble. I use 15" co-axials now, and I'd really hate to give up the bass response they give. I suppose open baffle is the way to do this, a la Linkwitz?

Peter C