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Old 25th February 2011, 12:19 AM   #21
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Quote:
Originally Posted by REDHORSEMAN View Post
I have just an hour of listening time with this amp so I haven't criticly compared this amp with my other kit amps.
The speakers I used are frugal horns that I purchased as a flat-pack with a pair of enabled fe126 fostex drivers,the bass is augmented with a pair of subs.
As far as hum and noise this amp is dead quiet to my ears
I would like to put together some new speakers for this amp any recomendations welcome

Bob

Hi Bob,

I designed these speakers specifically for this amplifier. They are about 98dB efficient. It is a 2-way bass-reflex design using the Eminence Deltalite II 2510 woofer and the Ciare 1.38TW horn tweeter. I designed the crossover with a Zobel network for the woofer and a compensation circuit along with required attenuation for the horn tweeter. They have a very live sound, actually they are awesome. It's like the performers are in the room with you. They are pretty flat all the way down to about 48Hz. The first set I built uses the traditional "monkey coffin" design, however I have redesigned the cabinet to be a more contemporary floor-standing version. I have not built the floor-standing design yet, but it should be exactly the same just not needing a stand to elevate them to ear level. I hoping to have the new version built in a couple of months as time allows. Let me know if you are interested.

I want to add that these loudspeakers seemed to take about 50 hours or so to "break-in". The low-end and tightness improved dramatically after running these for a while at relatively loud volume.

Scott
Attached Images
File Type: jpg Photo058.jpg (156.4 KB, 1660 views)
Attached Files
File Type: pdf towerspkr.pdf (38.0 KB, 203 views)

Last edited by scott17; 25th February 2011 at 12:30 AM. Reason: break in period
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Old 25th February 2011, 02:11 AM   #22
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Quote:
Originally Posted by scitizen17 View Post

They are about 98dB efficient. It is a 2-way bass-reflex design using the Eminence Deltalite II 2510 woofer and the Ciare 1.38TW horn tweeter.

Scott
with a 10" woofer
most likely max 95db

but hey, 95db, that would still be ok
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Old 25th February 2011, 09:19 AM   #23
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Quote:
Originally Posted by tinitus View Post
with a 10" woofer
most likely max 95db

but hey, 95db, that would still be ok
I believe these to be a little closer to 98dB like I originally stated. The woofer is rated at 97.3dB and the bass-reflex cabinet design affords about another dB increase in sensitivity.

Last edited by scott17; 25th February 2011 at 09:32 AM.
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Old 25th February 2011, 10:51 AM   #24
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Quote:
Originally Posted by scitizen17 View Post
I believe these to be a little closer to 98dB like I originally stated. The woofer is rated at 97.3dB and the bass-reflex cabinet design affords about another dB increase in sensitivity.
Since sensitivity and efficiency are not synonymous, I should have stated "sensitivity of about 98dB" not "98dB efficient" in my original post describing these speakers. I suppose I had an "old-timers" moment.
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Old 25th February 2011, 11:00 AM   #25
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Quote:
Originally Posted by scitizen17 View Post
The woofer is rated at 97.3dB
on paper, yes
and at a certain frequency
look at 500hz, or so
then ususally a different picture
I didnt even mention BSC
baffle step compensation
which means SPL loss below 500hz
compensation is done by attenuating above 500hz
subtract that, and it could be even lower than 95db
but I didnt

a calculator will also tell you this
even much bigger woofers often ends at 96db

does it matter
I dont know
but it is partly about whether a speaker sounds 'thin' or 'full'
maybe you compensate some by using tube amp, etc
and not to forget the bigger front baffle
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Old 25th February 2011, 01:25 PM   #26
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Thanks for your comments.

I did not use a BSC circuit in the design of these loudspeakers. Based on my calibrated measurements and frequency response testing, this is not required and would only offer detrimental effects.

Quote:
Originally Posted by tinitus View Post
on paper, yes
and at a certain frequency
look at 500hz, or so
then ususally a different picture
I didnt even mention BSC
baffle step compensation
which means SPL loss below 500hz
compensation is done by attenuating above 500hz
subtract that, and it could be even lower than 95db
but I didnt

a calculator will also tell you this
even much bigger woofers often ends at 96db

does it matter
I dont know
but it is partly about whether a speaker sounds 'thin' or 'full'
maybe you compensate some by using tube amp, etc
and not to forget the bigger front baffle
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Old 25th February 2011, 06:43 PM   #27
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Quote:
Originally Posted by tinitus View Post
on paper, yes
and at a certain frequency
look at 500hz, or so
then ususally a different picture
I didnt even mention BSC
baffle step compensation
which means SPL loss below 500hz
compensation is done by attenuating above 500hz
subtract that, and it could be even lower than 95db
but I didnt

a calculator will also tell you this
even much bigger woofers often ends at 96db

does it matter
I dont know
but it is partly about whether a speaker sounds 'thin' or 'full'
maybe you compensate some by using tube amp, etc
and not to forget the bigger front baffle
Now you've got me curious. I'm going to have to set up my test bed again and measure as you suggested. Thanks again.
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Old 27th February 2011, 02:00 PM   #28
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by scitizen17 View Post
Now you've got me curious.
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Old 28th February 2011, 10:45 PM   #29
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Default SE Amp Brochure

Did not mean to sidetrack the thread with the loudspeaker information. A new thread will be started for that when ready.

Here is a brochure for the amplifier with details all on a one page PDF.
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File Type: pdf SE_Brochure.pdf (127.5 KB, 687 views)
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Old 2nd March 2011, 07:37 PM   #30
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Quote:
Originally Posted by scitizen17 View Post
Hi Bob,

I designed these speakers specifically for this amplifier. They are about 98dB efficient. It is a 2-way bass-reflex design using the Eminence Deltalite II 2510 woofer and the Ciare 1.38TW horn tweeter. I designed the crossover with a Zobel network for the woofer and a compensation circuit along with required attenuation for the horn tweeter. They have a very live sound, actually they are awesome. It's like the performers are in the room with you. They are pretty flat all the way down to about 48Hz. The first set I built uses the traditional "monkey coffin" design, however I have redesigned the cabinet to be a more contemporary floor-standing version. I have not built the floor-standing design yet, but it should be exactly the same just not needing a stand to elevate them to ear level. I hoping to have the new version built in a couple of months as time allows. Let me know if you are interested.

I want to add that these loudspeakers seemed to take about 50 hours or so to "break-in". The low-end and tightness improved dramatically after running these for a while at relatively loud volume.

Scott
yea I would be intrested in floor standers
let me know


Bob
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