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In Reply to: RE: If you really want to hear what an amp like this can do posted by ahendler on April 14, 2017 at 10:59:00
Hi Alan, I was in flowermound texas for about a year with my GF turns out she is bat shit crazy..so nowa days living in surprise AZ :)
you remember me (lawrence) my friend Frank putnam? these were the days (early 2000's) i would attend the Chicago horn club meeting at peoples house's
and yes even with steve transformerms on your lowthers to tame them it was still harsh but it just could be my hearing is/was better then most
glad your doing well BTW what is your system today??
Here is my system
JWM turntable with Ortofon 2M Black cartridge
Shindo Auriges preamplifier with phono stage
2 each Berning ZH270 power amps
Magnapan 3.6 speakers on Wye stands
Cabling is Dueland and Western Electric
Macbook Pro for streaming Tidal which is what I do the most
Light Harmonic USB cable
Intona galvonic isolater
Singxer USB to I2S converter
Audio-GD Master 7 dac
Remember most of those meetings were at my house
Don't know what you mean by Steve transformers on my Lowthers. No such thing
I still have my Lowthers. They are front speakers in my home theater system
Hope you are well
Hey Alan, you have have a few systems since we seen each other, but its been like 17 years..
anyways Steve Deckert from decware cobbled up using his small outputs I believe across the driver with a pot to tame the lowthers ...
ringing a bell now?
Yes, now I remember. John Van Halen turned me onto that. You know John of Lowther Amaerica closed up shop because Lowther was under selling him
Yes I knew John quite well in them days even used to goto his business to BS and his home to listen ...John is a stand up guy shame money is always getting in the way they really screwed themselves.
anyways I remember everything and even before those you have acoustat 2+2's
Had Acoustat monitor 3's
Paul Eizik ;
Thanks for the suggestion . Do you know anything about their tweeter mod ?
I tried to email the DIY Soundgroup with no results . Are they on holiday or something ? Their Cinema 10 looked interesting but I could not find any flat pack information , there or at Denovo .
It has been mentioned , that just because a speaker has the required characteristics 16ohms , 100db. eff. and large volumetric box's , it may not play well with low power amps like the 2A3 . What else should I pay attention to ?
Thank you .
Oh and I forgot the big-o-woofers too !
Something else I was wondering about were folded horns and open back speaker designs . They seem to be 'an' answer to the large box requirement
but I see most of them implemented with small single drivers . None with large drivers. Why is that ?
Thank you .
I almost didn't see this because it's tacked on to Alan and Lawrence's discussion ; ) The Fostex T90 is a good tweeter and that's what was used on the BK10 I heard some years back. They are showing the BK20 plus T90 with an L-Pad to match the level of the tweeter (105 dB) to the woofer (96 dB), and they show a single capacitor (1.0 to 1.5 uF) as a simple crossover to limit the low frequency response of the tweeter. I would build it with a first order series crossover which would include an inductor coil to limit the high frequency output of the woofer, which would not be limited with just the single capacitor. So there's room for experimentation. Note that the T90 is shown on a dowel rod sled making it possible to get the woofer and tweeter in phase with each other by moving the tweeter back and forth to find the sweet spot. The speaker won't sound that different "dialed in" like this, but the stereo image will be much tighter with better instrument localization.
If you have a good 2A3 SET amp it should work fine with the BK20's. You don't say much about your amp, and I'm sure you'll get many opinions on that. I heard the BK10's with fairly powerful looking p/p pentode amp, but the BK20's are rated 96 dB and should be adequate for all but loud rock and roll with a 3 Watt 2A3 amp.
Open baffle speakers come in all shapes and sizes but they are at an efficiency disadvantage compared to horns. They are also at a disadvantage in bass performance unless the baffle panel is very large. So with a 3 Watt SET an open baffle would be quite limited and you would likely need a subwoofer.
I'm unfamiliar with the Cinema 10's
If you REALLY want to hear the beauty of this little tweeter, try it with an 18/db/octave high-pass.
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