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Spawn of Frugel-Horn
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Old 21st September 2006, 08:28 AM   #131
Scottmoose is offline Scottmoose  United Kingdom
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Back on the subject of the double horns, they were heard by a couple of guys who frequent the World Designs forum last night, and they liked them. They do get some nice room-gain... using Steve's stunning single ended valves amps (a 1w and a 4w), in his room, we got bottom string bass guitar loud and clear (~41Hz). I think they were a little surprised at the amount of LF we were getting. out of these little drivers.

Ed suggested angling them backward slightly, which cleans the LF regions up a fraction. One thing is confirmed: the don't like side-walls. Keep them in out you get a very large reflection through the bass regions in particular, probably due to the ~cylindrical wavefront. With well damped walls or treatment of course, it could well be better, so as always YMMV.
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Old 21st September 2006, 01:47 PM   #132
LilMik is offline LilMik  Honduras
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hello,

looking at the "spawn of frugel" horn plan, one can see that the compression chamber is not very small with 14.1 litre. what is -approximately- the horn's cut-off frequenzy?

have a nice day :-)
lilmik
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Old 21st September 2006, 03:00 PM   #133
Scottmoose is offline Scottmoose  United Kingdom
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Which cut-off frequency are you refering to, the upper or lower? The horn effectively cuts off above ~100Hz. The lower cut-off frequency depends on the room you have said horns in, and the amplifier. In-room extension is about 40Hz.
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Old 21st September 2006, 04:27 PM   #134
BWRX is offline BWRX  United States
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Would an appropriately sized supra baffle benefit this design like it does for the Frugel Horn? From an aesthetics standpoint it seems it would integrate better into this design because of the symmetry.

It would be relatively easy to experiment with some cardboard cutouts just for kicks.
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Old 21st September 2006, 08:54 PM   #135
steve shiels is offline steve shiels  United Kingdom
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As scott posted, he brought his speakers around to my house last night..
I was very impressed.. my amps do make good bass..
the result from such a small driver was very impressive..

quite directional, tilting them back improved things..

on a budget these are very good speakers...

... to be honest I was was a little concerned how my lowthers would measure up after listerning to these for an hour or so...

how do they now sound on the rotel scott?

cheers steve
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Old 21st September 2006, 08:57 PM   #136
LilMik is offline LilMik  Honduras
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thank you, scott :-). i was asking for the upper cut-off frequency.

in the picture below you can see the model response of 6 potential drivers, bwrx. it's from dave. you can find it on the first page of this thread. as you can see, there is a dip roughly between 170hz and 300 hz. i wonder if this has someting to do with the baffle step?

greetings
lilmik
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Old 21st September 2006, 09:12 PM   #137
BWRX is offline BWRX  United States
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Quote:
Originally posted by LilMik
as you can see, there is a dip roughly between 170hz and 300 hz. i wonder if this has someting to do with the baffle step?
I saw that in the modeled responses and thought exactly that. I figure a supra baffle would help, but that's only a guess. Scott or someone else would probably be able to answer that with more certainty.
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Old 21st September 2006, 10:41 PM   #138
Scottmoose is offline Scottmoose  United Kingdom
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Hi Steve, good to see you here!

I prefer not to think about my Rotel, though it does provide stirling service for the background role...

I must reitterate guys -Steve's amps are magical. 70 year old valves, you're looking at a purity you flat can't get from modern types. Stunning, and I'm really greatful for his and Ed's views. Looking forward to Saturday week and hearing the other systems now too! I'll try to put the Loreena McKennitt CD in the box this time round... ;-)
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Old 21st September 2006, 11:56 PM   #139
cheesehead is offline cheesehead  United States
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Default Horn noob question

OK, so I'm now excited on horns, I've given Martin his $25 for the latest versions, and have all kinds of dumb questions...

Quote:
Originally posted by Scottmoose
...Basically, nothing (gets out of the CC) much over 100Hz or so, bar a spike up in the 500Hz regions, which I haven't yet figured how to clobber (assuming it's audible) gets out of this thing.
How do you determine this? Can the CC just be treated as a BR & look at the frequencies passed through the vent?
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Old 22nd September 2006, 04:01 AM   #140
chrisb is offline chrisb
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Quote:
Originally posted by Scottmoose
Hi Steve, good to see you here!

I prefer not to think about my Rotel, though it does provide stirling service for the background role...

I must reitterate guys -Steve's amps are magical. 70 year old valves, you're looking at a purity you flat can't get from modern types. Stunning, and I'm really greatful for his and Ed's views. Looking forward to Saturday week and hearing the other systems now too! I'll try to put the Loreena McKennitt CD in the box this time round... ;-)

With Steve's permission, pray tell us more - or even pictures(?)
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