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Posts posted by MicroMara

  1. The RF 7 MK II gets these new terminals to which the external crossover are connected.The new terminal is installed with a walnut wood panel over the cutout of the original crossover.The loudspeaker terminals are made of surface-treated aluminum and impress with their comparably high material thickness of 10 mm. This high material thickness prevents Vibrations and optimally seals the weak point of the loudspeaker housing at the rear opening for connecting loudspeaker cables in order to create a stable pressure build-up of the acoustic vibrations to enable. Thanks to the silicone pad on the back of the terminal board, even the finest bumps at the connection point between Terminal and speakers housing completely sealed.


    The right picture shows a test setup on the original RF 7 MK II terminal, a couple of weeks ago. 


    The 12 mm2 single wire speaker cables are then coupled to the horns using my 12 mm2 jumper. I attach great importance to the fact that the horns and the mid-bass woofers receive a separate power supply.


    Regards MicroMara



    Lapp Bridge 12 mm2 Bild 6.jpg

    • Like 1
  2. 34 minutes ago, glens said:


    You've got plenty of good company over here in the States!


    Maybe we ought to hold a contest to see who gets the crown...

    My RF 7 MK II queen is already wearing her crown, who could become her king? Definitely not the successor of the MK II, I already had it in my music room to listen to. My Queen can only be refined with her Phase 6 Moddy, hopefully the many diamonds will not be too heavy for her. Not that it collapses under the weight of the sound diamonds.  I find it really exciting here ... with all of you ...... too bad I'm so far away .......

  3.  I just wanted to tell you that when I use this emoji, 🤠  I am very happy to communicate with you.You could also interpret this negatively, but that is by no means the case.

    I've been to the States several times and love your beautiful continent. I know NY, Vegas, LA, Frisco, Orlando, Chicago, New Orleans, every time I came back to Germany I thought Germany was a small village...


    Best regards MicroMara

    • Like 1
    • Haha 1
  4. And if I tell you now that I succeeded in replacing the 12 volt power supply on my Vodafone Gigacube LTE 4 G receiver, with a linear 230 volt power supply, I have achieved a quieter and more beautifully resolving sound when streaming with my stand alone networkplayer, then I guess soon no one wants to communicate with this "crazy German" anymore....😊

    The linear 230 volt power supply provides a linear constant 12 volt supply for the Vodafone 4G LTE  modem / router....


    Best regards MicroMara




  5. 9 hours ago, glens said:

    Re: coil vibration, round wire will behave acceptably so long as it's wound sufficiently tight and accurately, I'm sure.


    There I show a measurement that is required by everyone and then this is questioned again. Nevertheless, the crossover board construction must remain stable enough if the structure-borne noise constantly acts on the boards. Ultimately, all currents flow over the circuit boards.




    Best regards MicroMara

  6. I don't want to provoke or polarize with my thread. I am also far from wanting to teach anyone. Everything I do, the Moddys on the RF 7 MK II, the development and manufacture of power and loudspeaker cables, I passionately turn into a hobby. The RF 7 MK II potential analysis is an experiment. As soon as this is complete, I started with a series of measurements that demonstrate the acoustics of the modified RF 7 MK II. However, this will still take a while.



  7. 7 hours ago, Randyh said:

    this is not the first time that we hear of external crossovers ,  Bob Crites had a fellow from ITALY build  a   Cornscala with an exterior crossover , that was placed  in a metal box  at the rear of the cab -



    I thought about such a solution first, but didn't want to make the MK II a camel. Certainly, in terms of further contact resistances such as additional pole terminals for the speaker cables, the better solution. However, I only use the highest quality OFC copper pole terminals with a double 24-carat real gold coating and will keep the contact resistance at the lowest possible level.


    Regards  MicroMara

  8. Good morning gentlemen


    The picture above (above) shows the vibration curve of a round wire coil when it is exposed to structure-borne noise inside the loudspeaker housing. The lower graph, however, shows the vibration curve of a ribbon reel in the same loudspeaker under the same conditions. That's all .


    @ Glens  Please don't bite your lips, I know that a lot of things are confused with what I do like. But please believe me, would I go this long way from Germany to America to teach you? Certainly not, I am 58 years old and still have a long way to go. I am happy to receive your advice and / or instructions.


    Best regards MicroMara

  9. I will now report a little about the components I have selected for the crossover


    1.Superior Cups

    Warm sound image Excellent reproduction of all acoustic instruments, clear as a violin. A little brighter than a Mundorf M-Cap silver / gold, which probably explains the good spatial information and the separation. A super audio cap with neutral sound


    2. Waxcoils 

    Reels impregnated with natural wax have a more precise high-frequency reproduction and a full fundamental with increased detail, compared to normal reels and in the entire frequency range. In the bass range, the wax coils are in a class of their own. Full deep bass and full dynamic range, clean and clear sound.

    With their warm appearance, wax coils are, in my opinion, better than silver or silver-gold coils, which despite their merciless attention to detail look a bit cold.


    3. Silver-Mica are probably the best bypass capacitors. The sound pattern influence looks like this. The contours appear sharper and at the same time the last bit of hardness disappears. Everything sounds more harmonious. A must for every high and mid-range crossover. They are fom Germany .


    4. The High End resistors from Germany

    The exceptional resistance non-magnetic - induction-free.Precision technology Resistance wire made of non-magnetic special alloy. Conductive ceramic core, flame-retardant silicone sheathing. Completely induction-free thanks to Ayrton-Perry Winding.  The resistance wire consists of two wires connected in parallel in the opposite direction of rotation. The residual inductance is therefore only made up of the connecting wires. 


    I think I will finish the crossover by the end of January......

    .......and then I'll apply to Klipsch. They then set up a new product refinement department, such as the cooperation between Sony from Japan and Mr. Swoboda from Germany, which at the time was original Sony products with a modification license. So he was allowed to act as an official partner of Sony ......




    Best regards MicroMara



  10. 55 minutes ago, CECAA850 said:

    If I'm reading this correctly you're referring to the material that's damping the inside of the speakers.  I was wondering what you did to the ROOM acoustics you referred to in step 2.  That can have a very profound difference in what you ultimately hear.  Much more so that the material that you put in the cabinet.

    It's probably a matter of mutual understanding, my English probably doesn't always hit the nail on the head. The room acoustics were never changed, when I had the house remodeled, the drywall builders did a clean job for room acoustics, I have reverberation times of only 0.2 seconds, which corresponds to studio quality. Nei you understood correctly, by dramatic I meant the result of the new insulation material, the housing is now dust-dry, there is no airborne sound or structure-borne noise in the MK II housing. The basses are drier, faster, more precise in the illustration.


    The middle of the bass snaps into your face, the entire bass area plays more relaxed, harder, more merciless, the kickbass is extremely clean, the subbass rolls resonance-free through the music room, and the horn body is additionally damped do his job in peace. Never before has modification level 2 played so precisely across the entire frequency range. I couldn't believe it myself


    I forgot two other important aspects of phase 2 moddy. On the one hand, the air mass flow is now directly on the two reflex ports, there is no more air turbulence. On the other hand, the rear wall is now massively better damped, even on the left and right next to the bass reflex ports I have integrated snnake stripes and the crossover installed on the rear is massively decoupled. It is no longer subject to vibrations, so it can now process the impulses very cleanly.


    The picture shows the irritation of a coil by structure-borne noise



    Best regards Micromara



  11. 9 hours ago, billybob said:

    Forgot for a minute you are not in Great Britain. Just a title of a OO7

    Film...book, for your eyes only.

    Nothing derogatory intended, I can assure you. A bit frivolous at times, maybe. Nothing to apologise for. On the contrary, still rather enjoying the progress of your presentation here. Thanks for asking.

    That was Sheena Easton, wonderful theme song. Now I understand, thank you very much. My pleasure 😃

    • Like 1
  12. Once again a really very last statement regarding "Contact Enhancement"......


    Conditioning the contact surfaces with "CT" minimizes the contact resistance on all types of connectors (XLR / RCA / loudspeaker / digital etc.). The result - your hi-fi / high-end system plays to the point - precise, open, with a stage. "CT" achieves a significantly higher performance. And this with every system. Mostly, hi-fi and high-end combinations transmit signals less than 0.000001 volts. So incredibly small signals. A good MC phonotone cell e.g. produces maximum 0.4 mV. Assuming a dynamic range of 60dB, the smallest signal is less than 1 trillionth of a volt. Even with normal XLR or RCA connections, the smallest signal components are in the pico-volt range, i.e. at 10-12 or 0,000,000,000,001 volts.


    The decisive factor in the transmission of LF signals is that it is the last percent that really interests us. Because this last percent contains the sonically interesting details such as spatiality, fine coloring, fine dynamics. If these details are not transmitted, we will hear music. What touches, goosebumps, airiness, sense of space, grip is not felt.


    Best regards MicroMara

    • Like 1
  13. One last piece of information about the Contact Enhancer


    Before: Is between the two contact surfaces Dirt and oxide layer embedded, there is only a few direct contact points......

    After : The contact agent has removed the dirt and the missing parts with atoms refilled. Over the whole contact area is now a positive connection is established. The improvement in contact quality is considerable.



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  14. 16 hours ago, glens said:

    That's what I thought you'd said.  The coils could be painted or have anything non-magnetic smeared all over them and function the same.  You are aware of this?

    The coils were matt after 4 years, at least on the surface. However, current only flows on the surfaces of a coil. You would have to measure how and whether the current flow from an untreated to a treated coil changes. However, my focus is now to deal intensively with the new external crossover for the Rf7 MK II. The new, wider and deeper housings are already in the works, I think they will be completed in a good 14 days.

    • Like 1
  15. 35 minutes ago, glens said:

    While the cables look really nice, and I'm sure they also conduct electricity at least as well as needed, I'm still stuck on the use of the contact product on the drivers and crossover.  How so and why?  And what was the result, specifically?

    The "Contact Enhancer" linked by me is used as follows. As a stopper on the bottle there is a small swab in the liquid line at the end of the stopper. All Cichkabel / XLR cables are wetted on the plugs and sockets, both inside and outside. The same is done with his electronics ... on all Chinch / XLR / Digital / KoAx / Terminla pole terminals on the speaker, the contacts of the speaker cables, i.e. bananas, spades, angled banana plugs, etc. Also the cold device sockets to network players, CDP / AMP / Phono / so everywhere. Then reassemble the system  😂


    I do not give a sound rating, nor a guarantee that everyone will hear / perceive in his chain ... so I would like to know if someone of you tried it out, what happens there or not .....

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