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Old 23rd March 2009, 12:42 AM   #1541
bvan is offline bvan  Denmark
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Bass is very good, and the four Beta-15A'a only cost $US300 the lot!

The white stuff is 9mm wool felt. Makes a very noticeable difference with imaging and smoothness of HF.
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Old 24th March 2009, 02:33 AM   #1542
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Default MCAP-CR Cabinets

Here's a new type of Feastrex cabinet design from a Japanese designer.. using multi-cavity chambers..

http://www.geocities.com/sg_suzuki/F...x_Project.html
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Old 24th March 2009, 03:10 AM   #1543
dpaws is offline dpaws  United Kingdom
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Default Re: MCAP-CR Cabinets

Quote:
Originally posted by BTW
Here's a new type of Feastrex cabinet design from a Japanese designer.. using multi-cavity chambers..

http://www.geocities.com/sg_suzuki/F...x_Project.html
Fantastic find - many thanks - please, if you can find anything for the larger 9" Feastrex drivers it would be much appreciated

Cheers, Steve
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Old 24th March 2009, 03:26 AM   #1544
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Default Re: Re: MCAP-CR Cabinets

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Originally posted by dpaws


Fantastic find - many thanks - please, if you can find anything for the larger 9" Feastrex drivers it would be much appreciated

Cheers, Steve

Hi Steve,

Thanks, I guess you could take the cabinets and scale them up.. Anyway, you can also try contacting the designer via his website.

I'm currently in the process of doing a big corner horn for my D9e... You can email me .....
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Old 24th March 2009, 03:40 AM   #1545
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Quote:
Originally posted by cdwitmer


but basically

1) She who must be obeyed insisted that I do a bunch of other things first,

and ...


i usually try to make make myself scarce, when this feeling begins.

although didn' take long, for her to find my, 'hiding place' -

Click the image to open in full size.


127835
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Old 24th March 2009, 10:49 AM   #1546
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Hmm. Re those multi-chamber jobs, I'm not entirely certain how they think they can patent them. I mean, it's not as if it's something that hasn't been done for decades. Interesting enough though.
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Old 24th March 2009, 10:54 PM   #1547
bvan is offline bvan  Denmark
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Default Feastrex and current drive amps

I'm concidering one of the First Watt amps to drive my Feastrex, likely F5, of F2 if funds cant stretch.

Looking at a series of published FR graphs showing the current source amps with other full-range drivers, the amps seems to flatten the FR curve quite conciderably, raising the bottom end and bringing down the typically peaking top end.

I'm wondering though, with the D5nf sounding pretty flat as is, to my ears, would these amps unwantedly lower the presence region/upper mids/lower trebble, or does it leave an already flat FR curve pretty much as is?

thanks for any input.

B
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Old 25th March 2009, 02:27 AM   #1548
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Current source amplifiers (the F1 and F2 are examples) bulldoze
their way through impedance variations for good or ill.

Typically any FR driver coupled with a current source needs some
sort of passive network in parallel (not series) to flatten out the
response. This is easily done, as written up in pieces on
www.firstwatt.com

Most of the time it's a simple RC network.

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Old 25th March 2009, 03:08 AM   #1549
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And although it is off-topic,

-- Chris

you are never 'off topic', in your own thread ...
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Old 25th March 2009, 06:32 AM   #1550
bvan is offline bvan  Denmark
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Thanks for the reply Nelson.

I reread the Current Source Amplifiers and Sensitive / Full-Range Drivers" article but am still a bit unsure.

It seems a current source + network can both increase (FE166E)) or decrease (PM2A) the upper treble, compared to a voltage source. So given that I'm happy with the D5nf's frequency response (dont need more bass as I'll high-pass with have active woofers, and dont want any less upper mids), and given that I couldnt predict the effect a network would have, I cant see the worth in pursuing a network. Am I missing something? (my electronics knowledge is non existent so please excuse).

I'm also not sure the effect of current source WITHOUT network vs voltage source. The DX4 graph is the only one to show current source with network vs current source without, and I'm suspecting by the traces that current source without is the same as voltage source?

Basically, I'm wanting to understand what effects, if any, the First Watt amps will have on the frequency response of the D5nf in the absence of any parallel networks (which I wouldn't have the knowledge to calculate start values for anyway)

Many thanks
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