mikebse2a3

@kippy congratulations on your purchase of the Heritage Jubilee which are amazing…!!! Your MC252 will most likely be a very good match and well worth giving them a chance before trying anything different. Getting the loudspeaker/room integration optimized is where the magic happens… 🙂👍 miketn

List Prices seem to need updating in the article… 🙂

I suspect it might be the best way to obtain desired Q values at the frequencies of interest in a particular circuit as it relates to compromises in building real world inductors.

Would love to have seen this 😀

Thanks Michael for sharing the pictures and details of what Roy has accomplished with the continuing evolution of the awesome La Scala and Klipschorn. I certainly missed being there with all the Boneheads 🙂 miketn

RIP Bob Heil

Interesting…. But I would suggest the Heil AMTs be vertically aligned and as close to the K402 as possible to minimize image smearing assuming you want the best imaging possible with this configuration. miketn 🙂

I was fortunate to have met Larry several times and our conversations were always interesting. Rest In Peace🕊️

Reading through this thread it sure seems apparent to me that it is the Decware amplifiers are the source of your Hum Issue. The question then becomes why are you experiencing it at such a high SPL level at the listening chair. This makes me ask how you experience the Hum when you walk around in the room.? Do you hear it as significantly louder and quieter as you move around and also as you measure it with your SPL Meter? I could see in an unfortunate situation where a possibility that room modes at 60Hz/120Hz could be coupling very efficiently with the loudspeaker and listening positions that would exasperate the inherent by design hum of these amplifiers. An unfortunate combination of room dimensions could lead to Room Modes that could easily add +12db to the Hum Level at some areas of the room. Just a thought anyway and I hope you find a solution to this problem… 🙂 miketn

ChrisA posted some information here JC

Well the DPH paper say’s Neglible Improvement past 4ft so whatever gives you peace of mind 🙂

I hope it does…. I have the “The Vacuum Tube Logic Book - Second Edition” and none of the resistors or capacitor values are on the schematic and it also appears to have a mistake (ie: connection line is missing from 2.7k resistor to DIP Switch Resistors) as seen in the schematic drawing above where the DIP Switch resistors are not shown as being in parallel when in the “ON Position” with the 2.7k resistor shown in the above schematic. Yes you should be able to determine the values with a meter.

@shawnwes You can find more pictures here if you haven’t seen these before that might help you. https://www.stereonet.com/forums/topic/248051-withdrawn-or-relisted-fs-vtl-the-ultimate-preamplifier/ Here are a few pictures of a VTL Ultimate Pre-Amplifier and the schematics I was able to see before I was locked out and requested to join the group. This one was on another topic post on the same website.

I’m thinking this was posted in the past here but I thought this nice Interactive Frequency Chart may be a helpful tool for those trying to evaluate their systems performance by being helpful in narrowing down what areas they feel could need improvement. This link will take you to the actual “Interactive Frequency Chart” https://alexiy.nl/eq_chart/ Example: This picture below shows the Instrument Data for MALE VOCAL miketn🙂

I can play a CD but not so much a guitar 😁

Finally here..!!! Pre-ordered 6 months ago and sounds great 🙂👍

Based on my own experience with the DSpeaker and my La Scala AL5 I believe with some fine tuning the OP will be able to reach a place of satisfaction with more of his music being enjoyable. The “emphasis” in the 100Hz - 200Hz region is audible and I personally consider it a significant improvement and that a more accurate reproduction of the recordings are achieved when it’s effects on the recordings are removed. I respectfully disagree and I certainly don’t believe the OP, myself or others discussing the “emphasis” in the 100Hz -200Hz region of the La Scala AL5 is wrong or misleading anyone. It’s really simple in my mind and that is if you want to fine tune and thus improve the reproduction of the La Scala then implement the PEQs that Roy has suggested for active user who have that capability. This is easily achieved by active methods but my guess is that it is impractical in passive crossover designs (impedance would drop to low in value with compensation network) or “I believe” Roy would have implemented it in those as well. @Flevoman wants the most enjoyment he can achieve from his system as I do and I believe most anyone on this forum wants so he is searching for the answers to achieve that goal wherever it leads and thus started this thread simply to find answers and solutions. miketn🙂

For what it’s worth I personally find it helpful to step back from the keyboard and let some time pass by and then reread post from a calmer perspective. I truly believe most here have good intentions 🙂

@KT88 yes I believe he could add a PEQ: 148Hz / Q:8 / Level: (+2 to +5db range) as a trial to compensate for some of what the Auto-Room Compensation adjusted it to. If it proves to be a move in the right direction for @Flevoman then it could be fine tuned if needed to reach his listening goal. NOTE: This is Roy’s PEQ setting except we are now using +db levels to compensate some for the Auto-Room Compensation and find the balance Flevoman desires. Other PEQ; filters can be added to fine tune the region more if desired. It’s important to understand that when you compensate for room modes the bass/mid-bass can at first be perceived as light versus before the compensation. Because the problem room modes are adding a false boost which also mask clarity/detail then by the room compensation removing this false boosting the “perception” can be of a much improved clarity/detail in bass and also in the midrange and hi frequency but also of this perceived lighter bass/mid-bass and some listeners will find it desirable to increase the level in the corrected region. The DSpeaker can perform this in several ways like the PEQ I’m suggesting above. It might take some time with trial and error to find the balance someone desires but it should be achievable. I do understand not everyone is comfortable with the process or desire to spend the time to become familiar enough with what a DSP EQ offers and that’s understandable. miketn🙂

@KT88 is a valued member who has always contributed in positive ways for many years on this forum.

@Stephen Buck Your Germans and Fascists comments are totally inappropriate and among the most foolish I’ve seen on this forum in 20 years here.

@Stephen Buck if you have the ability to use Roy’s PEQ of FREQ:148Hz / Q:8 / Gain: -7db then you will hear the excess “emphasis” on the Chris Isaak “Blue Spanish Sky” is gone.

I’m in his camp also and I can hear the difference and I also own the First Watt F3 and when using it with my La Scala AL5 it’s great and maybe(its very close) my favorite even over my Cary CAD 2A3 amps with the La Scala but it doesn’t solve less than ideal recordings or other issues that Tone Controls and DSP all when properly used can compensate for. Combine them both and my music sounds even more natural and realistic. 🙂 No point in continuing down this road since it’s like trying to change someone’s religion where you believe what you want and I’ll do the same but I just don’t care for how easily some people want to judge what is right or wrong and basically say those who use Tone Controls and DSP aren’t discerning listeners. ( ie: BS) miketn🙂

In the real world the “Circle Of Confusion - Floyd Toole” is rampant and to use tools (ie: EQ and Tone Controls) to compensate (ie: even correct in some circumstances) doesn’t make you a “non-audiophile” and a member of the masses as you describe. The better your system and the more revealing the system the more obvious the differences are in recordings and proper use of Tone Controls and EQ is a valid choice. Do all recordings sound perfect to you? If not then what do you do when they don’t? Do you not listen to them and only listen to “perfect recordings” ? Well designed equipment like my McIntosh C50 pre-amp has 8-band Tone Controls that can be bypassed on really good recordings and engaged when less than ideal recordings are played and this allow me to enjoy a wider range of recordings that otherwise I couldn’t. miketn

@KT88 keep in mind Amir would probably never recommend any of our “beloved” Tube Amplifiers based on their measurements. Measurements are definitely important but they hardly tell the complete story at the stage we are currently living in and it all ultimately has to pass the “Listening Experience of a Human” in the real world. miketn🙂