It kind of has a preamp - there is a line-level gain stage internal to the chip. I wouldn't say you are able to work with it or tap anything out of it though.
But I believe any rig to do this will be VERY simple.
Plate amps generally have their own volume controls to allow them to match the level of the mains.
Hello all.
I'm wondering if either of these would work. What happens to the radiating figure 8 pattern when one half see's a finite baffle and the other side see's something closer to an infinite baffle -- okay not infinite, but really big by comparison - approx. 6m (nearly 20') from front to back going the long way round.
Obviously the baffle to the left of the entertainment unit (EU) has the drawer protruding forward of the baffle, potentially upsetting some of the upper frequencies covered by the woofer.
If the upper frequencies covered by the woofer would be upset due to the EU's drawer then a simple extension on the baffle to create an 'L' shape would allow for the baffle to be flush with the front of the EU like the baffle to the right in the image.
Of course if it's just a stupid idea and I haven't thought about it enough, which I haven't then could a moderator please delete for fear of public lynching
I'm wondering if either of these would work. What happens to the radiating figure 8 pattern when one half see's a finite baffle and the other side see's something closer to an infinite baffle -- okay not infinite, but really big by comparison - approx. 6m (nearly 20') from front to back going the long way round.
Obviously the baffle to the left of the entertainment unit (EU) has the drawer protruding forward of the baffle, potentially upsetting some of the upper frequencies covered by the woofer.
If the upper frequencies covered by the woofer would be upset due to the EU's drawer then a simple extension on the baffle to create an 'L' shape would allow for the baffle to be flush with the front of the EU like the baffle to the right in the image.
Of course if it's just a stupid idea and I haven't thought about it enough, which I haven't then could a moderator please delete for fear of public lynching
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Here is a similar concept that I have been working out using some Wild Burro Betsy speakers in OB combined with a tapped horn hidden into the bookcase proton of an EU. The sketch shows one bookcase as being 36 inches wide and the other as being 24 inches wide to see what they would look like. In application both bookcases would be the same size.
Now if I could only come up with some $$$ to do a bit of prototype work
In this concept everything folds away for storage and WAF......(of course)
Now if I could only come up with some $$$ to do a bit of prototype work
In this concept everything folds away for storage and WAF......(of course)
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First order slopes should work, I simmed low pass at 200 Hz and high pass at 500 Hz and the response looked pretty good. You could probably dial it in better by making the crossover frequencies a little closer, but the concept looks promising.
I made sims ( for 2 Alpha 15a and Sonido 8" FR for both 12 and 6db/oct
look here - pictures are enough :
OB za Davora - DIYAudio.rs
posts 1 & 2 - for 12db/oct
post #40 - 6db/oct + comparison 6 vs 12
look here - pictures are enough :
OB za Davora - DIYAudio.rs
posts 1 & 2 - for 12db/oct
post #40 - 6db/oct + comparison 6 vs 12
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Hi Jim
You should try and lift the ground on your plate amp plug
it will eliminate that hum.
You should try and lift the ground on your plate amp plug
it will eliminate that hum.
My timing was good to scoop up a case just before they dissappeared, so i have fairly good stock, although it seems people are just now catching on to how good these little drivers are.
dave
Dave,
And I have you to thank for turning me on to this driver with your comments and the micro-Fonken. Those sounded so good that I immediately ordered a second pair from Madisound--which lead to the MJK OB build late in the season. (And good that that happened as I have not had time to begin my planned builds for this summer.)
Cheers, Jim
And I have you to thank for turning me on to this driver with your comments and the micro-Fonken. Those sounded so good that I immediately ordered a second pair from Madisound--which lead to the MJK OB build late in the season. (And good that that happened as I have not had time to begin my planned builds for this summer.)
Cheers, Jim
MJK's "OB 2 drivers corner passive" worksheet simulation of FF85K shows a -5db decrase in the SPL response, resulting in a final SPL of 83db for the full range driver. Did any of you observed the same result? I run the simulation after I noticed a significant reduction in SPL after replacing 86dB/Wm cheap car speakers with 88dB/Wm Fostexs in my cardboard OB prototypes.
I wasn't expecting this since the FE103En didn't exhibit this behaviour in MJK's original OB paper and rated SPL values are very close (88 vs. 89dB/Wm). Can you please tell me which T/S parameter contributes to this result for FF85K?
If I'm not making a mistake in the simulation (though my listening confirms this result), is it the semi-U-frame that helped Jim balancing the SPL levels of drivers by reducing the LF SPL?
Thanks.
I wasn't expecting this since the FE103En didn't exhibit this behaviour in MJK's original OB paper and rated SPL values are very close (88 vs. 89dB/Wm). Can you please tell me which T/S parameter contributes to this result for FF85K?
If I'm not making a mistake in the simulation (though my listening confirms this result), is it the semi-U-frame that helped Jim balancing the SPL levels of drivers by reducing the LF SPL?
Thanks.
Same problem in my simulations
Are you setting the value of Sd properly in driver properties? It turned out for me that I took that field as a formula instead of a value that needs to be entered.
You can replace the area calculation formula directly with the value of the Sd in the worksheets, i.e replace
"pi*r^2" cm2
with
"28.4" cm2.
Hope this helps.
Does this mean that your simulation now indicates a more appropriate or expected efficiency?
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