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12 dB / Butterworth, 800 HZ., 16 Ohms.One crossover is done, the other one gets done Sunday, Easter.
Also desperately need to replace my Type 45 DC amp's speaker jacks, hopefully this Sunday evening, with something much better ( Cardas Silver- Rhodium ).
Wow, I will soon FINALLY get to hear my own finished A7-800 implementation. It should be FUN to hear.
I determined that 12 to 14 pounds of mass-loading was the ideal amount for my crossover, ( a "sweet spot" ensued, richer harmonics, more dynamics, higher SPL ) hence the added on top plate, to hold incrementally-added bricks.
I had to SUBTRACT an equal amount from the A7 enclosure's mass loading, easy to do with these concrete tiles.
Now, everything in my audio system is mass loaded, by ear.
My Type 45 amp is now up to SIX bricks, and it is delicious to hear. VERY focused sounding. So, I have discovered each audio component in a good high efficiency system has an an optimum mass load !! Amazing stuff.
Jeff Medwin
Edits: 03/25/16Follow Ups:
Hey Jeff looking real good looking very industrial!
good speaker binding posts or output jacks etc are going to be very expensive for the good ones ...I would suggest to make some of your own like we have in the past with the HK :)
these are known to be excellent sounding top to bottom connectors
If you cannot maybe i can help you
Lawrence
Lawrence,Thanks, but I actually avoid terminal connections, whenever possible, in my crossover execution. KISS rules.
Hard-wired, wires wrapped around and soldered, Wonder Solder Classic.
Partially-built photos ( 3 above ) show this.
On amplifier, I am converting this Easter weekend to Cardas Silver Rhodium short speaker posts / terminals, ( so I can swap for out-of-absolute phase recordings ). All else is soldered.
I also eliminated the terminal connections, on the stock ALTEC 515B and 802D drivers, and soldered the speaker wires directly to the tabs holding the voice coil wires, and tie-wrapped the speaker wire to the driver frame ( to eliminate damage from inadvertent tugs ).
That is better sounding to my ears !! Wonder Solder in all cases.
Jeff Medwin
Edits: 03/26/16
Hi Jeff.
Are the large gray cylinders capacitors? I have not seen that type before.
Nice open pot as well.
Yes sir Kyle, a newer type of cap.
Look up, and see reviews on Clarity Cap DTAC MKP. The cap I use can do high current I rms= 64 A. and it has an ESR if 1.3 mOhm at 100 kHZ.
The pot is a nuded ALTEC 10 Ohm pot from a stock 801 Crossover. Please notice how I have eliminated the metal terminals, and wired two paralleled 14 AWG wires ( equals 11 AWG ) directly to the pot's internal elements, "skipping" the terminals with their dissimilar metals.
I find it important to match driver levels ( 802D to 515B ) to 0.1 dB, and do so by ear, hence, a pot gets used.
Working on a second DC Type 45 SET stereo DIY build - started in earnest - tonight.
My ALTEC VOTT speakers are done for now. Hooray !! Need to break-in all these film caps.
Jeff Medwin
97.90.71.201
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