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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
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Old 5th February 2018, 06:14 PM   #941
Nikodemuzz is offline Nikodemuzz  Finland
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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
Thanks Dave! That is very helpful! People seem to be using a variety of amps with these, don't they? Honestly, I'm a bit surprised how people seem so happy driving them with such low-power amps as well, considering that the efficiency of these drivers is not terribly high. If not terribly low either. I don't listen at very high levels, and presume even a few watts would generally produce more than adequate sound levels. I have been more worried about the capability of the amp to handle dynamics.

That ACA amp is totally new to me, but looks very interesting! Thank you for the tip! I think I will make myself a pot of coffee and start reading through the thread. =)
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Old 5th February 2018, 07:19 PM   #942
planet10 is online now planet10  Canada
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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
It turns out that it is not so much how much rated power an amp has, but how well it recovers from clipping, and how it interacts with the impedance of the speaker. Since FHXL has a benign impedance amps are not overlly stressed.

I have a big room, and the nominal 5W ACA i borrowed from Chris really impress. They seem to have way more power then they are rated at. I can push them into audiable clipping but at levels that are typically higher than i listen to. The new ones will have the higher voltage PS bricks for more power, i’ll have 4 channels to either beam, or if i can get balanced out of my preamp (more likely change preamps) thay can be used mono at 2x the power.

dave
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Old 7th February 2018, 01:44 PM   #943
ellisr63 is offline ellisr63  Mexico
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Is there anyone in the San Francisco area that has a pair I could listen to? I am coming up there next week for a few days and would love to hear a pair.
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Old 7th February 2018, 08:56 PM   #944
Nikodemuzz is offline Nikodemuzz  Finland
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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
Quote:
Originally Posted by planet10 View Post
I can push them into audiable clipping but at levels that are typically higher than i listen to. The new ones will have the higher voltage PS bricks for more power, iíll have 4 channels to either beam, or if i can get balanced out of my preamp (more likely change preamps) thay can be used mono at 2x the power.
You are not the only one saying that the amps seem to sound like they carry more power than they actually do. This solution has certainly caught my attention, they seem very well regarded. Do you know any more information about the new amps coming available?
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Old 7th February 2018, 09:14 PM   #945
chrisb is offline chrisb
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variac might be able to shed some light on that
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Old 8th February 2018, 08:06 AM   #946
Nikodemuzz is offline Nikodemuzz  Finland
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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
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Originally Posted by chrisb View Post
variac might be able to shed some light on that
Thanks Chris, I will ask him and stop steering this thread off topic. =)
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Old 8th February 2018, 11:33 PM   #947
kevner1954 is offline kevner1954  United States
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The great thing about the FHXL is that they don't need a lot of power for all to be revealed!!!
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Old 15th February 2018, 03:54 PM   #948
Toby Jug is offline Toby Jug  United Kingdom
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Hi Dave, I got a set of plans for the Frugal XL awhile back is there a version available so that these can be computer cut ???? And what speakers are currently considered best for low power OTL Valve amps please !! Thank You.
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Old 15th February 2018, 04:59 PM   #949
chrisb is offline chrisb
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Toby - I did some brief comparison listening a year or so ago between A10.3 and Fostex FF165WK, and the latter have a slight edge in sensitivity, but the Alpairs definitely have more extended LF response.

As for plans for CNC work - I think Dave may have already produced DXF - and if not I can probably do that as well.
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Old 15th February 2018, 05:37 PM   #950
planet10 is online now planet10  Canada
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Frugel-Horn XL for Alpair 10.3/10p, Fostex FF165wk, more
I get asked this alot so i will just attach the boilerplate answer.

dave

Quote:
<boilerplate>
DXF or DWG files are easily exported from the CAD software, native format is Vectorworks. I need to know the page of the PDF you need, and the version of DXF/DWG that can be handled. (i do have a collection of already exported)

It should be noted that a CNC is only really useful for the sides and the driver rebate. Unless the CNC is 5-axis, you will still need to pass all the internal pieces thru a table saw -- it is quicker & easier to just do them all on a table saw. You could rough cut the other pieces but they still need to go thru a table saw to angle the ends.

The drawings all assume a 5 mm kerf, so the CNC operator would need to adjust for the larger kerf needed for CNC work. You/they will need to adjust for actual wood thickness as well.
</boilerplate>
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