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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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hm..lots of interesting information to chew on, and by and large, i've had similar experiences with first order crossovers on bass drivers .. this being my experience with a full range amp, and a two way system-- which is a far different critter than...
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what a great idea-- i never really thought of a sort of 'low pass bypass' inductor of sorts?! i'd always assumed that inductance was similar to capacitance in that regard-- the more you add, the more you get-- but hadn't thought about the...
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Hi Markus,
The realisation that in my implementation, going first order on the bass unit is an unacceptable compromise. I have never tried a third order PLL crossover but imagine the losses are noticable.
But I've heard the losses of putting a...
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Hi,[quote user="morricab"]You may be right. It would perhaps be worthwhile to look into "better" transformers but I am not sure that an advantage can be found over just going RCA to XLR adaptor into the balanced inputs and thereby bypassing the...
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[quote user="Thorsten"]MY PERSONAL current realisation (where I to build one) would look like this:1) S&B TX-102 as volume control, with suitable switch2) 2V Lithium Battery negative pole to the grid of the Valve, bypassed with good non-magnetic ...
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[quote user="Romy the Cat"] The HF Range “F” channel: The 6E6P-DR at 30mA connected at tetrode. The filter is second order with Sowter 9858 Pultec MEQ-5 EQ Inductor 420/277/145/108/61/34 mH) and variable air cap. The variable inductance and capacitan...
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Keith could you clarify? The TD 4001 has 1st order acoustic slope below 1khz when mounted on most horns. So adding a 1st order electrical slope to that surely does not make a textbook 1st order crossover.
If the 1601a is being run first order abov...
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I will address the low voltage DAC power supply first since it has multiple applications.The front end comprises a commercial 48/12 volt 20 watt dc/dc converter. This basically is used to provide 1000 volt isolation input to output otherwise you...
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[quote user="Paul S"] If you have the Mercury SR2-9013 35mm master Dorati/LSO Nutcracker, that might be a treat [/quote]
Hate that performance. Dorati did not play Tchaikovsky appropriately. Each and single Dorati’s Tchaikovsky piece sound to ...
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Hi Jessie!
I’m probably suggesting the obvious, but have you tried adjusting the crossover component values on the fundamentals and MF-channels? On the fundamentals-channel, increasing the inductor-value, and decreasing the cap, so tha...
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Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, not much power and...
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[quote user="noviygera"] I want to listen to both 12db/octave and 6db/octave passive versions and see which one sounds better. And keep the one that sounds better. [/quote]Herman,
It depends what you would like to listen. If you would like to ...
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Well, the points you bring up are valid but as anything else it all highlight problems with people not with equipment. I am not sure that I am glad with my decisiveness and sanity in MiniMe projects. I was trying to rationalize the MiniMe idea in the...
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.…as everything was discussed here before.[quote user="chaos"] …when i tried your recommendation with s2 and 3uF cap my "basshorn" refused to roll of;-) [/quote]
This is normal, I have written about it many times. Those large bass drivers have a lot...
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[quote user="ayebee"]I’m probably suggesting the obvious, but have you tried adjusting the crossover component values on the fundamentals and MF-channels? On the fundamentals-channel, increasing the inductor-value, and decreasing the cap, so that...
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[quote user="Romy the Cat"] There is no aspects of minimization
of the inductor size. You can go to 30K, or 50K, or 100K input LPAD. The LPAD (which
is not inductive switched attenuators with good resistors) anyhow sites behind
the filter, so the ...
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[quote user="cv"]On the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.[/qu...
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[quote user="serenechaos"] I do not know of importance of enemys death to this topic. [/quote]
Oh, this is a sheer pleasure but do not call that dirt enemy. He is not enemy but way beyond it, he is the person about whom I have a death-wish as ...
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Romy,
Air core is ok, but. 1. Self inductance in an unmitigated field clumps. You can easily see this by unwinding a hockey puck style air core inductor and measuring the inductance with each turn removed. Never will you have the smooth loss of indu...
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My string quartet have just spent 6 days recording haydn and being assaulted by nasty Genlecs.
I can assure you that this is NOT what I want my system to sound like.
(Actually I sort of began to see the point of them after a while.. but
that's ano...
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[quote user="nl"] Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, ...
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[quote user="Romy the Cat"]The events of the last 3 days are incredibly stupid, incredibly interesting and very educational. During the last few days I have discovered some very interesting phenomena, ok might be no a phenomena but a behavior, th...
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The last night I had truly alarming in experience. I visited
Bill who had my original Dannoys and brought to him my SIT Yamaha B3 amplifier.
He did kind of in the same directions that I did, disconnected his horns and
was experimenting with Danno...
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Dear Romy, regarding your efforts to solve variations in mains power supply, there has been an interesting thread on RAT related to the use of toroids as power transformers that morphed into a discussion about the level of DC offset in mains power su...
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ACTIVE CROSSOVERS
1) Loudspeaker drive units of different sensitivities may be used in one system without the need for lossy resistive networks ( and L-Pads ) or transformers
( DEQX lets me use 98 ...
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