The Nautaloss Ref Monitor

[xrk971]

I was stationed 15 miles from the Luxembourg border in Germany, and we were tasked with keeping the Russian camera jets out of German air space. Daily, they would enter at the top of the Eastern side of West Germany at top speed and run toward Italy, spy cameras rolling. 2 of our F-15s would crank up and fly to meet them. We many times actually caught them before they got out of German air space. Now that was flying! In a contest, we once did 123 sorties in 23 hours, then ran out of pilots, with only 2 F-15s out of commission of the 24 in the squadron, a world record that can't be beat

You could write a movie script based on this! Sort of like Top Gun x Tom Clancy.

So glad your music life has been improved by my designs, thank you for the kind words - it means a lot to hear this kind of feedback.

You should check out my latest foam core design with a two-way interpretation of the LS3/5A using all budget priced Dayton drivers. It is also superb sounding and is a true monitor.

RST28F and DC130A Foamcore Homage to LS3/5A

 

[JRKO]

Question: does the coil HAVE to be a single smooth shape or can it have corners? Perhaps with the caveat that any corner is always greater than 90°?

 

[xrk971]

The iron core coils I use are wound on a sharp edge square shape.

 

[JRKO]

Ah my bad! I didn’t read the post before mine and shouldn’t have use the word coils.

I was asking about the physical nautaloss construction with in speaker box.

Sorry about that

 

[xrk971]

I think there are differences between the the smooth coiled rear chamber of the Nautaloss vs a TL rear channel. On the latter, square edges are ok because you want them to act as low pass filters to keep the mids and highs from escaping. On the former, smooth rounded coiled rear chambers are perferred because we are using this as a rear wave absorption chamber so you want to wave to go farther back and get absorbed slowly by the stuffing. I am not sure it makes a big difference in practice, but that is my thinking. Maybe square but with chamfered corners would be adequate? We are basically making an optical equivalent of a Wood's horn light trap.

 

[boswald]

Well, since the Cornu is full of corners, and we are listening to what goes through the maze, I guess empirically we know it's fine.


Besides, waves(not rays).

 

[jccart]

Bass Nautaloss with Beta 15A



Here are the results with the Beta 15A driver. I am using a 56 in long path with a 16 in wide cabinet. I have not wrapped up the coil to see how big cabinet will be but I am guessing about 40 in tall x 30 in deep. If you mount the driver near the floor and aim the coil up, you get floor bass enhancement. I am including a 35 Hz 2nd order high pass filter, and a 1mH+4ohm resistor for BSC.

Here is the freq response with no reflections from walls or floor:

If you place speaker 60 in away from back wall and assume the driver centerline is 9 in above the floor, here is the frequency response - this may work well to cross-over with the top horn at about 1kHz:

Impedance and Electrical Phase:

Max Cone Displacement is at 16 volts (good for 112 dB):

Impulse Response:

hi bit of a long shot but would you be able to see what the fane 15300tc would do in a cab like this ? or give me some pointers of how to
work it out myself ? thanks in advance james

 

[xrk971]

You can also do this with HornResp and make a tapered closed-ended TL.

Send me a link for the TS parameters and I’ll see if I can simulate it for you.

 

[jccart]

https://www.fane-international.com/view-product/SOVEREIGN-15-300TC#tab-1 thankyou I hope that worked

 

[jccart]

You can also do this with HornResp and make a tapered closed-ended TL.

Send me a link for the TS parameters and I’ll see if I can simulate it for you.

from what I've tried so far open baffle wins on low level detail it would be interesting to see if absorbing the rear wave had the same effect