jazzmessengers

Happy Thanksgiving everyone!

I believe the largest SEOS horns, but even they don't have excellent control down to what K-402 can do. There is another graph of "globe view" (looks like the earth viewed from the north pole on a globe, not sure what this sort of plot is called) of K-402 polars but I don't have it saved to this computer. @Chris A do you have it?

In my opinion after doing a lot of searching there isn't anything commercially manufactured that is the equivalent or has similar performance to the K-402.

Has anyone tried to do the crossover with Audiovero Acourate? It's software DSP that generates a convolution filter that you add to a convolution engine that would be in the software music player like JRiver, Foobar2000, etc. A couple of links for those interested: https://www.computeraudiophile.com/ca/ca-academy/acourate-digital-room-and-loudspeaker-correction-software-walkthrough/ https://www.computeraudiophile.com/ca/ca-academy/Advanced-Acourate-Digital-XO-Time-Alignment-Driver-Linearization-Walkthrough/ I suggest reading the bottom link on using it for a digital crossover after reading the first link. There is also a very helpful Yahoo usergroups message group where the designer is very active. I have heard it in a fully active system and was stunned at the difference in imaging and overall gain in coherence. Sort of switched me from being one of those guys that thought about the small things to the things that made huge eye opening differences.

IME damping factor will also play a big role if these amps are being used full range. Where I find SET sounds good is 1) headphone amps and 2) active systems with the SET only driving midrange/treble horns with extreme sensitivity with flat and high impedance. I would not use them with bass horns, even those extreme SETs like the 833 at 100 wpc since the damping factor won't match SS.

How would you say it compares to SET amps if you've had them? The last Pass amp I had was the Aleph 3 which was push pull and had feedback.

Those look fantastic!

You should re-rip everything to lossless. Storage is so cheap these days that you should only be listening to music that is digitally identical to what is on the disc. One other option for a digital crossover is AudioVero's Acourate. There is a Yahoo Groups forum you can request to join and the designer of the software is very active and helpful. Recording engineer MitchB wrote two detailed entries about it here and here. (No affiliation with the software/designer)

I recall your sale of the Red Spade Audio synergy horns and various other midbass horns. What is your planned system now?

I like Mogami or Canare. Basically the same stuff they're wiring up recording/mastering studios with. Around $0.50 to $1 a foot.

In the off chance they're sold I would trust Chris A that the TD-4001 will work fine. Those are IME much easier to come by, I used to see multiple pairs listed on Ebay nearly every week. You just need to do ask the right questions and make sure you're getting a non-abused pair. Like one other person posted, they are incredible sounding compression drivers.

Thanks, I was going to give them a try, but it's always nice to hear if people had real world experience. I recently heard laurellhill's Jubilee setup as mentioned in the post here. Truly outstanding speakers that are now at the very top of my list of considerations. Active crossover version.

I believe I asked this another thread, are there any K-402 owners that are running TD-4001?

I'd like to extend a thanks to laurelhill for letting me hear his Jubilee system. As I told him I was very impressed with the speakers. I would like to hear the setup at the Klipsch factory and speak to Roy in person. From everything I heard they are at the very top of my consideration list.

I would be going active, there would be a different amp for whatever bass horn below it. When I've looked at spectrals for classical music I've noticed the same thing, the most energy is the in that upper bass/lower midrange. I'm not chained to the idea of using my 2 watt amp, the FirstWatt SIT is another I've been looking at.

It seems like you've taken personal offense by my post, I did not mean third degree as in you were literally torturing me, hence the use of smiley. I did think the "sharpening your thinking" was a bit unusual, since I thought it was a reasonable thing to ask. I meant sensitivity in the truest 2.83v measured definition not as a meme or something abstract. I was genuinely curious about it so I asked, I even mentioned measurements in my first post so it would be clear I was asking about the objective definition. I'll not debate the accuracy of tube amps, SET amps or whatever. I am looking for accuracy, I personally think you can get that from a good low power amp assuming it is well designed (IME not the vast majority of commercially designed ones) and there is plenty of headroom. Which is where my question regarding sensitivity (true definition) comes in because I was wondering if I would have enough headroom with my current amp. If it didn't no big deal, I don't have any particular dogma I subscribe to and wouldn't mind swapping to a higher power amp. I know that the speakers and room will always be the largest determinant of sound quality.

Watched this with a group of friends at a SB party. One of my close friends kept us in decent spirits through half time/Q3, just unbelievable. Still in shock.

Why the third degree It was DIYAudio when I was doing searches on constant directivity horns. I realize there are a lot of subjectivist posts that are unsubstantiated which is why I asked here. As for why I asked it first off curiosity and I'm always up for learning something and secondly my favorite amp is a 1-1.5 watt DHT driving DHT SET which I could use on an actively crossed over compression driver/horn. The thread you linked to was one of the posts I was referring to.

Heading out to a SB party now. Go Pats! The Pats have succeeded in cloning , hoping that defense steps up again today.

A question about EQ'ing the THT, how are people choosing to do this- Measuring at the listening position, measuring with the mic a meter away from the horn opening, or using Bill's 1/2 space measurement then correcting that in the crossover?

I believe with the K-402 and TD-4002 (I imagine 4001 as well) you need a decent amount of boost over 8 KHz (someone please correct me where exactly this occurs), where the large format compression driver naturally starts to fall off. I don't think they need any other EQ (boost or cut) below that since both are pretty linear.

This is something I've read from a few different posters on another forum, but with no measurements to back it up. What they're saying is a compression driver that needs to be EQ'd quite a bit, for instance the EQ required for a controlled directivity horn in the treble will diminish the sensitivity. How accurate is this statement, and how much sensitivity loss is there?

Has anyone tried the TD4001 on K-402? The lack of snout adapter won't have any effect? From what it looks like from external photos the snout looks like it adds to the expansion of the K-402.

I have Geddes Nathans in my HT, so I've been living with constant directivity speakers for a while. They do not exhibit the coloration I heard on the SH50. Again I should stress that it wasn't egregious, but just "present". I have the MFSL SACD of American Beauty, the mastering engineer said basically nothing had to be done to it in the transfer from tape. Let me know if anyone wants to hear one track off it (from the redbook CD layer).

The Darth Belechick era has been good to us, but Boston sports was far more rocky prior to this century. That's what I try and tell my friends from the rest of the country Thank you very much for the invite, I'll send you a PM when I'm home.