John Curl's Blowtorch preamplifier part III

Status
Not open for further replies.
If you are getting differences in sound due to cables there's a reason.

No, there are reasons.

Look, a several months ago I would have completely agreed with you. Your position is perfectly understandable.

Also, agree there are a lot of way-overpriced junk cables sold to audiophiles. It is very unfortunate, but people can't be protected from every stupid thing they might do.

Regarding the audibility of cables and the reasons for it, it is all explainable by conventional physics. Its just that the models we use to think about cable physics are sometimes a bit too oversimplified.

Benchmark Media sold star-quad mic cables for awhile, don't know if they still do. There is physics to star-quad cable that measurably improves its performance in some ways. There are other physical changes to cable design that are possible too. Don't want to go into it any more deeply since there is IP of Jam's involved and it is and not mine to share.

Also, I didn't want to restart this whole subject, Evenharmonics is just trying stir things up and get people fighting in order to deflect attention from his ongoing agenda of harassment.

Only reason I ever mentioned it in the first place was because I found the discovery personally stunning. Maybe like you would if you happened to visit here and swap all the different cables around, measure for oscillations, do whatever. All there is to find on that subject is that cables do have a sound. Look out though, if you ever describe what you found here in this forum, expect to take a lot of verbal flak for it.
 
Last edited:
You absolutely qualify as an "audio professional", no questions about. The story about the superior sound of the 7805 regulator, over a modern LDO consolidates your reputation.
I hope it is a joke ?
Not that an expensive device imply better sound quality, but because all depends of the performances VS application.

If snobbery has limits, so does miserabilism
 
Last edited:
Separately, cables are big money and that's why 'audio professionals' are shocked when you try to call them out on this stuff.
When you design a studio, you have to take decisions about the cables, and, indeed, it is an expensive part.
Several criterias to be considered. depending on the applications. For fixed cables, it depends if they are welded or pinched with a special tool. Good shielding, reliability, ease of making strands, rapidity of work (fast and clean stripping). (Belden is my prefered brand).
For moving cables (micros) flexibility, resistance to stretching and microphonic effects are to be considered in a different way.
Cable for patches is a special purpose with special requisites.
To be sincere, "sound of cables" is the last of concerns, apart some special situations like dedicated cables for some everyday microphone, like Neuman.

I believe we all have our own preferences.
 
Member
Joined 2014
Paid Member
ATC aren't that expensive by audiophile standards. More than I can afford but not hyper stupid money and it's a clear no-BS proposition with them. I've always admired their speakers.



Ref cable swaps. If someone took some identical lengths of interconnect to make 2 sets and terminated one set with normal Neutrik and one set with the EMC series and could hear a difference I would not be totally suprised, but would tell them something was very amiss in their house and system to need the extra supression. But for well screened STP on std XLR I would raise an eyebrow.



I prefer balanced interconnects for peace of mind. But that's just me being irrational.
 
...The story about the superior sound of the 7805 regulator, over a modern LDO consolidates your reputation.

Yeah, you have made it plain on multiple occasions that there are a number of things you 'hate,' 'can't stand,' etc. Anything that annoys you catches your ire, and that includes people that disagree with you without providing proof to your satisfaction that you are wrong. Of course, it annoys you to be wrong.
 
High SPL on a system set up for high SPL is where you get the realistic dynamics.

My last system could do (with a good recording) 105db @ LP (9’) which to me is right at the threshold of live reproduction. the new system I’m putting together will (should) cleanly do 5db more......looking for more headroom not really more SPL.

I find if one can make it sound clean at these levels it pays off when listening at regular levels (for me it’s about 92db +/- @ LP)

Take a drum kit for example, at what distance and room size would you expect dynamics at that level?
 
Having been in a small room with a live drum kit with a zealous drummer (call him bam bam!) many times, I could just about reproduce a drum solo with my previous setup.....new setup should (hopefully) be on the money. Basically doubling down on cone area and wattage....
Pro speakers is where it’s at for dynamics.
 
Last edited:
High SPL on a system set up for high SPL is where you get the realistic dynamics.

My last system could do (with a good recording) 105db @ LP (9’) which to me is right at the threshold of live reproduction. the new system I’m putting together will (should) cleanly do 5db more......looking for more headroom not really more SPL.

I find if one can make it sound clean at these levels it pays off when listening at regular levels (for me it’s about 92db +/- @ LP)

Didnt know all live reproduction was at the same level.
 
Speaker compression is a phenomenon well known to all rock guitarists who care about their tone. It's a thermal effect, no magic or snake oil involved.

Mostly right , but 35% distortion is BS.

"Apply power (music signal) & the voice coil jumps to 120°C and the resistance rises to approx. 7.5 Ohm….Now the resulting current flow through the voice coil drops by approx. 35% ….So does the SPL….This is a 35% distortion!
 
Dynamic compression is very common above 90 dB SPL in traditional dynamic speakers. Voice coils get extremely hot and resistance rises. Also linear cone excursion can be quite limited. Soundstage won’t even test speakers above 95 dB SPL as most will fall apart. Even if it doesn’t blow apart you mostly get only distortion above 95 dbSPL. Many speakers distort significantly below that level.

You are best to go for pro designs like ATC with 3 or 4 inch diameter voice coils in a very tight tolerance massive motor assembly. Large ATC can play continuously at 121 dB SPL with less than 0.3% THD - this is loud enough for totally realistic drum transients etc. - unfortunately this level of performance is expensive and often only justified in professional studios like this

STUDIO C | blackbirdstudio

Well stated, Richard!

The studio firm I work with is an ATC dealer and properly set up SCM 200/300s with subs can play above 100 dB average without any noticeable strain, with peaks above 120 dB. Too loud for me, but clear proof of excellent dynamic headroom, which is the whole point: before mixdown, compression and limiting the dynamic range of individual channels is pretty amazing, and very high headroom is needed to properly set up mics, levels and the rest. Here is an example of a studio complex we built a while ago: The Tracking Rooms - Manifold Recording
The last time I was there checking out the new music for film editing suite, Branford Marsalis had just left and his band's music was still on the stands. I heard some playback and I can't say enough about how great he and his band are...plus hearing his sax channel soloed gives you the mic's perspective of how powerful sax sound can be. YouTube

The very best sound I have heard has been in various recording studios, I don't think people appreciate how much limiting and compression go into a final mix in almost all recordings...

Cheers,
Howie
 
Regarding the audibility of cables and the reasons for it, it is all explainable by conventional physics. Its just that the models we use to think about cable physics are sometimes a bit too oversimplified.

I doubt anyone with a deep understanding is involved, look at the Hawksford debacle. I said the other day I missed DF96 only to find out he has passed away, truly sad.
 
I missed that, easy to hear but no input/output signal comparisons no matter the resolution show any difference. Ironic Jam comes from a Pass Labs background where the amplifier colorations are easily measurable (I consider Jam a good guy BTW). This all makes no sense on numerous levels.
But once you put into the formula that he (affiliated with jam's audio business) has gone into the full blown shill mode now (was in sleeper mode when he joined this forum), then it makes sense. :nod:

yes, do try it exactly the way I told to do it. Not any other way you might imagine.
Sure, anyone can if they want to try a pseudo objective comparison of live vs recorded sound.

An audio professional would be someone who uses audio professional gear? Usually to generate an income, ie, T........... allegedly ;)
Then that would be called "alleged audio professional".

Again, the cables sounded better than what I was using before. The old speaker cables were 4' - 5' of #12 zip cord with Speakon connectors at the amp end.
What kind of comparison method did you use? Please share the details of the setup so that others can try it too.
 
Mostly right , but 35% distortion is BS.

"Apply power (music signal) & the voice coil jumps to 120°C and the resistance rises to approx. 7.5 Ohm….Now the resulting current flow through the voice coil drops by approx. 35% ….So does the SPL….This is a 35% distortion!

Thermal time constants have been completely ignored in all these numbers the heating effect is not instantaneous.
 
Please don't get me wrong, they are excellent speakers. However, could even be great/superb with the right 4-channel dac, the right DSP, and some good linear mode power amps. It would not be trivial to do though, a bit of a project.
Too bad you didn't even mention a thing about the room acoustics which is one of the biggest hurdles in the audio reproduction. :rolleyes:

But, having had this discussion with people I know I would not convince you. Its just the way it is. I've listened to enough high end gear to know what to expect and what sounds right and doesn't. And I've heard enough claims about cables that were patently false. I always have to shut my mouth and just accept it - not here of course!
Try not to push him too hard or he will threaten to put you on his ignore list. :D

Evenharmonics is just trying stir things up and get people fighting in order to deflect attention from his ongoing agenda of harassment.
You shill for jam's audio business. I'm just calling that out for those who aren't aware yet.
 
Thermal time constants have been completely ignored in all these numbers the heating effect is not instantaneous.

From a player's point of view, the effect is rather fast, maybe a bar (musical bar) or less, a couple of seconds max, before the compression sets in.

There's another angle to that: when we're talking about that sort of SPL (LOUD!!!), the ears also compress and change the frequency response.
 
Status
Not open for further replies.