And for dissipation on L-pad I was surprised that X sim etc. shows much much less dissipation from existing R11, and again I have planned to make one just as trial to hear where it takes me...
Not cheap of course but it doesn't have to be expensive either. BatoMM with two lm3886 bridged with its 70W/8 ohms and remote feedback function will get you there for about 150€ in parts for two monoblocks without chassis. To save the money on chassis you mount the amp on 4mm thick aluminium plate and make your own plate amp but one of high quality. You can use EI transformer and mount it separatelly on the other side of the speaker cabinet - no need for toroids because things aren't clustered in a smallish chassis.
That's what i considered doing before i sold my Beyma 15K200 and with that act i exited the hi-eff crowd 🙂
That's what i considered doing before i sold my Beyma 15K200 and with that act i exited the hi-eff crowd 🙂
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This is not exactly on resistors in speakers, but I'm putting it here because SBA10 crossover has several resistors that are HEAVILY underrated so everyone who has bought and build the kit is welcome to contact me PM and I'll point the weak spots.
From the Test Bench: Resistor noise and non-linearity - Audio Precision
dissipation on 10W resistor @100W
From the Test Bench: Resistor noise and non-linearity - Audio Precision
dissipation on 10W resistor @100W
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The data XSim is showing for power dissipation is inconclusive in respect to true power dissipation for it shows the apparent power dissipation. Depends on phase angle through that network branch how close or apart these two different power figures will end up being.
Here's how different Rdc but same inductivity of series woofer coil models on my current loudspeakers:
0.25 ohm - 1 ohm makes for 2.5dB of difference so i think that 2dB of your woofer would be easily compensated with higher Rdc coil.
0.25 ohm - 1 ohm makes for 2.5dB of difference so i think that 2dB of your woofer would be easily compensated with higher Rdc coil.
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Jantzen C-Coils have very low resistance, 13AWG 22mH is only 0R15
Bass coils must handle high power, they need to be heavy wire and thus low resistance. Air cores have higher R, but how about heat then with higher AWG like 15?
Component values are not public, I used 20-22mH, check links.
This pic is from TG's website
Bass coils must handle high power, they need to be heavy wire and thus low resistance. Air cores have higher R, but how about heat then with higher AWG like 15?
Component values are not public, I used 20-22mH, check links.
This pic is from TG's website
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Easily no heat with up to 1 ohm coil Rdc. Voice coil will be fryed much before series woofer inductor with Rdc of 1ohm gets near the problem. The wire is usually 1-1,4mm thick for air coils that has to be slightly higher Rdc. Wire in voice coil hardly ever goes more than 0,3mm. It gets thicker only in car subs that have 4 layer coils or any 4 layer coiled sub for that matter.
In my project with Seas L15 i used 3mH - 7 ohm coil in notch filter so i had to add only 8.2ohm resistor in that notch to get me the attenuation i wanted. That little coil packs more power than any resistor i can put there, it makes the coil smaller so it can be easily fitted on the crossover board.
In my project with Seas L15 i used 3mH - 7 ohm coil in notch filter so i had to add only 8.2ohm resistor in that notch to get me the attenuation i wanted. That little coil packs more power than any resistor i can put there, it makes the coil smaller so it can be easily fitted on the crossover board.
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Yes, from a dampening standpoint, low DCR is better. I've had excellent performance results with these:
ERSE - Super Q
The photo is not from an air core coil, it has a ferrite core.
Impossible to reach such low inductance values without that "help", they are air core would be huge...
Only my two cents ....
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Hallo
Great job
I am looking to build SBA-10 for a long time. First high end speakers, and hopefully end game.
As same as you, a am not happy with design.
Can I contact you on PM for some questions?
Best regards
Milorad
Subotica
To my experience the woofer is a bottleneck in the build. Yes can take plenty Watts and also play deep with good weight. I find that it cannot do complex Music well. Sound is muffled.
Satori WOP 24 is much better. Of course run out of steam before the SB29 woofer.
Satori WOP 24 is much better. Of course run out of steam before the SB29 woofer.
200 Hz is just fine in that application. Needs a new woofer if higher crossover is desired. IME.
Its better for sure but it's not swappable in this configuration - kit