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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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It is a RAAL Lazy Ribbon with the integrated transformer doubling as DSET OPT. Surprisingly, I started with a 4th order high pass filter which has steadily migrated back to first order...and it works.Next step is to trial a biradial horn for a bit m...
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Romy, You make all very good points. I probably shouldn't call the front of the driver a phasing plug, because actually the long wavelengths really don't care much about the shape of the exit, they will just pass right through...
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Listening to the horns, it seems that they indeed die somewhere below 120Hz. I was surprised, and a little disappointed that it seemed so steep. Good to hear that it's to be expected!!Yes, I'm using a 30-something-Hz 1st order high pass on them ...
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Guy, here some unconnected comments that you might find worth considering. They are in no order or importance, just random thoughts.
1) Talking and describing about horn we shall always mention at least 5 mandatory characteristics
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[quote user="Chirag"] Well..my first question would be regarding the application. The big Melq tube is already doing the bass towers...is it not enough current? [/quote]
Chirag, I’m not planning to use this power amp in my system. ...
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[quote user="stevie7V"]… they can be used effectively in parallel with the main speakers and running about 5 or 6 dB quieter. I use them with a separate amplifier and adjust the volume until I 'just can or can't hear them'. At this level,...
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The failure Herman had was probably on the input side - not the output. You will notice 2 things. 1. The system operated normally for 6 months, so it is unlikely an overload issue.2. The PurePower did its job of protecting the audio equipment (self s...
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[quote user="Romy the Cat"] There were some educational for myself observations made, in some way saying something about this specific DHT, in some way saying something about Melquiades’ single stage version and the Melquiades’ full-range two-stages ...
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Okay, I think I understand.... and thanks for the link on the YO-186... if I can ever locate some of these I'll be sure to grab some (hmmm, a trip to Russia perhaps). As tubes get very hot internally, there were some procedures for trying to eliminat...
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I see, let me to explain how the this work all together the you will be able to make your own judgement. Let look at the functional purpose of the emails in there. The R1 resistor is a loading resistor. This is understandable. It makes sense to kee...
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[quote user="rowuk"] In the case of horns, I think that most fail to see that it is a simple band pass device. [/quote]
Yes, this is as simple as that.
[quote user="rowuk"] Applying a high and low pass filter to a standard speaker driver cr...
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Head today to another local audio guy who listen to my new
configuration. The reaction was fascinating. He was asking: what the hell I had
done to midrange? Of course, I did nothing, but the question was very accurate.
A lower mid-range changed ve...
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[quote user="Teflon"]If I understand you, your amplifier uses line level frequency selection at the input to each channel, and the output of each channel is optimized for the frequency range of interest -you worry not about the performance of a chann...
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[quote user="Paul S"] The "calm HF" effect is something I have long sought but seldom experienced from repro, and I have blamed the amps as much as the ribbons. Mere HF extension is not enough. Hard to say whether the amp or the rib...
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[quote user="jessie.dazzle"] Resonant frequency :
I did not try to measure it. Can anyone confirm the following : I assume this parameter is most easily determined by playing a series of tones at constant signal strength (volume setting) whi...
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Hi,[quote user="Romy the Cat"]However, even if you did succeed to preserve dynamics in your line-level transformer then the LF cut off of this transformer will “get” you. The solution is very simple: do not run any transformer attenuators within a re...
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Within my site I many times stressed the importance of upper bass region for sound reproduction. I always said that with the improperly sounding 200Hz -400Hz any further "fidelity" of Sound becomes imposable. Ironically the 200Hz-400Hz is the most co...
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Mani, I have long run an 8" Lowther DX4 down to 150 hz, over 2nd order high-pass. My impression after plenty of listening is that I wish I could cross it at ~ 400 Hz. The "problem"is not simply how "low" the 8" driver will go but it is also a quest...
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Miab, since what I became an expert in cables? I am as much as anyone else – a subject of accidental discovering...
I do not use in Injection Channel any fancy cables. There is not a lot of need for it. The Injection Channel is mixed with M...
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Zanon, I do not mean DEQ, but that is one way to do it. D[SET] is another way; and it can be done in real time, by a couple of means.If you actually settle on the mid-field monitor approach, you will want that sort of speakers installed before you g...
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I would like to pass some summarizing observations and some generalizations regarding the entire “Water Drop” project.
THE IDEA
The idea of trying to find a tweeter to compliment Macondo was a good idea. Many of you know that I was proudly declari...
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Yes, tapped horns are lower efficiency, mine are 105 dB (not 108 - 110 dB like the rest of the system). I don't even KNOW that SET or Class A is automatically appropriate for tapped horns... Something like op amp driven PP in class AB might even wo...
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AlloOnly the cheapo Shure see-saw... perhaps I can improvise a balance to check the weight.I thought about the compliance business, as the HK diaphragms look like the surround embossing is narrower, which would make them less compliant (if they are a...
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[quote user="ayebee"] The horns that Stereo Lab make are very good, especially considering the relatively modest prices. I bought the "Ultra-Fi" version of the 140Hz horns and they are of course not completely free of resonance ….Present system consi...
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I think I found a good configuration for de-emphasis. The air caps will not work as there is nothing to amplify the capacitance. RC filer with cap to ground is good but I would like to have the entire de-emphasis with no capacitor at all, it will be ...
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I think it might be very interesting to introduce the high-pass filtration for tapped horn and to see how it behaves. It is not only about thermal overload and restriction of excursion. The unloading of none-used bass generally clean-up the transpare...
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Yes, a cheap inductive l-pad between OPT and S2 in midrange channel. Interestingly, the frequency response of the first order Lazy Ribbon is remarkably similar to a response you posted somewhere on this site of the Water Drop with third order filter...
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Romy,Interesting video. The first thing that came to my mind when you were talking about HF colours and the "clean" RAAL Waterdrop tweeter, is perhaps adding colour to the RAAL. Instead of blanding out the midrange S2 and injecting HF colour with t...
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As I am slowly put Macondo back to the business a question come to my heard: how can I make the Injection Channel sexier visibly? As now Macondo is re-assembled and reinstalled but with no Injection Channel sitting atop. I extend no room for argument...
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I would like to offers some thoughts about possible avenues for Pure Power 2000 improvements. Those thoughts are no specific to the recent November-December events and have broader generic implication. I initially intended to write it to Pure Po...
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