Dave A

How can you tell with the bottom hidden? If it is off it is not as much as John's was.

I am in and anyone wanting to split a room and trip expenses by sharing a ride if you happen to be close by PM me.

No substitute for good commercial amps.

Car audio https://www.youtube.com/watch?v=40rPNX15eCI

Boy you have that right. Went to a dirt circle track race last Friday and it is stunning the number of blue screen faced idiots who paid to watch races watching dumb cell phones! I sit on the front deck and watch nature and go to the ridge top at times for .223 R&R with Tannerite and no fakebook for this guy. Go eat out and look at all the zombies "talking" to their internet buddies while the people with them are ignored. I would far rather hear birds or Super MWM's any day IN PERSON and I just don't get blue screen people.

PM's sent. Regarding the Forte, If there is anyone from that area heading up towards Nashville and willing to bring them I would like to talk to you.

I know that I was just agreeing with you. I had those suckers turned up and can you imagine what it must of sounded like to someone with good hearing?

Pretty much what I said.

Yes they do and then spout the world is going to end in 12 years becuase.

Primary differences are the MAHL's are flush with the motor board front with no alterations so you gain improvement there on sound quality and I have a clamp plate that allows for more than one type of driver to be used on the same horn lens if you wish too. I have no idea if there is potential for resonance problems with thin wall horn lenses but the thicker sectional area of the machined lenses would tend to be better at suppressing that. Claude tested these two types of setups and loose in the air with the DE120's they were almost dead on similar which I figure is a testament to the superb B&C DE120 drivers. And of course if you go to the larger K-76,79 type of horn lens I am the only one making anything for it and it is much better than just replacing a diaphragm. Plus with the larger MAHL there are probably dozens of different drivers you can use on the existing clamp plate which currently comes drilled for four different common screw sizes and patterns. In addition the two sizes also come with 1 3/8 18tpi internally threaded clamp plates so you can use externally threaded drivers where possible. The idea behind the MAHL's was two fold and it was to be a direct dropin where the lens mouth would be flush with the motor board front to eliminate having to alter the cutout to fit zee brackets in most cases. Some of the later models of La Scalas for instance have large enough cutouts to fit those zee brackets as is but all older ones don't. Klipsch has gone to this design also which I think is evidence they found an improvement worthy of doing. The other one was to make a modular clamping system which would allow for the use of a variety of drivers and not be limited to just one. Technology changes and I can simply machine clamp plates to adapt to those and you don't have to change it all just to migrate to a new driver. I have also for instance adapted the size of the small K-77 Mahl replacement to fill the larger cutout in later model La Scalas with a larger horn lens than the standard size one and this is the flexibility of being able to design and then step out to the mill and machine a part. You don't change anything on a molded part without all kinds of trouble but a mill does not care and will cut whatever you need. I can easily accommodate changes from new drivers to new motor boards at any time.

Prettier than mumps though.

Say if you had the money I could cut a set with her lips around the cavity perimeter and you could answer that question for us. Arty Farty Pizza Party.

To be honest I have never sat down and run these back to back to try and determine that. I doubt my hearing is acute enough to be able to tell and they both get mounted in wood motorboards. The section of the horn lenses is pretty thick all things considered so I regard them as cosmetic differences only. I think the Walnut when stained is prettiest and the Aluminum far stronger and for strength reasons my personal preference is aluminum all things considered. I have some spalted Walnut I have thought about cutting for some time because it is darned pretty. I have some next to where a big branch came out and I think they call that a Herring Bone pattern and it looks cool. How they sound relative to each other has never been anything I have considered or worried about.

My thought was since they are radiating out in the same exact pattern and the surface itself is smooth it would not change anything. Then again who knows if exaggerated more what they would be like. Just a curiosity at this time unless there is interest.

I broke a tap off in one of the lenses the other day and it is scrap for all practical purposes. But I got to thinking about trying something I have thought of for some time and that is to add a pattern to the cut. These little dips and humps are called scallops in machining lingo and can be more exaggerated quite easily. So what do you all think of this idea?

Walnut and Red Oak are on hand.

Well today Mr Brain hooks these up and runs a tone from Audacity. So I start off with 19khz and think what the heck hardly anything. Then I go for 15khz and much more and by 14khz gobs of sound. It's funny how we can forget common sense while testing. These are certainly odd birds compared to regular tweeters and my first experience with Piezos.

Which is precisely what happened. I would figure they would if not used. These are basically old new stock and I can't imagine they have a spoil by date.

I wondered about that since the max input is 30w and I doubt the sweep generator gets that high. I will try a hookup tomorrow and see. I don't think this has been used and yes ohms was way high which threw me. These are not K-77's for sure and I bet they are much louder.

Ignore this please a Google search turned it up.

My assumption since a random test of a tweeter checked out fine that voice coils are not the issue. I did get a very faint output from the whole unit so something is getting through and since that is the case I did not check the fuse but perhaps I should anyway. I will dig deeper into it as time permits.

I am looking for the schematic for this if anyone happens to have it.

I prefer the setup you have although the only KP-600 I have heard was at this years Pilgrimage. I think the MCM is more musical and the KP-600 more rockin smoky club. I would choose the MCM any day for my personal listener. I may not have heard those KP-600's at their best perhaps due to environment and I don't know how good the music files were. I assume Kevin knows what he is doing so I suspect I just prefer the MCM.

Here you go Mark

That would be super and please let me know.