Zener diodes are in my Infinity Kappa 5.1 crossover in the tweeter circuit, I believe it was to protect the Emit-R's. Which were killed anyway by an errant screw from a previous life.
I have dynaudio Car tweeters in it now. Its a MD100/2 variant. Its also 4 ohm. However I find its a bit weak. Lacking in SPL especially. I also have some hissing noise audible in the tweeter. I cant imagine that is in the tweeter itself, these have a good reputation. Of course I got it used, so who knows.
Would getting rid of these Zeners get me a bit more spl ? What would be the side effects ? These dynaudio's are supposedly impossible to blow, they are 100 watt with 200w transient capacity.
Thanks.
Srinath.
I have dynaudio Car tweeters in it now. Its a MD100/2 variant. Its also 4 ohm. However I find its a bit weak. Lacking in SPL especially. I also have some hissing noise audible in the tweeter. I cant imagine that is in the tweeter itself, these have a good reputation. Of course I got it used, so who knows.
Would getting rid of these Zeners get me a bit more spl ? What would be the side effects ? These dynaudio's are supposedly impossible to blow, they are 100 watt with 200w transient capacity.
Thanks.
Srinath.
Zener diodes are effectively reducing tweeter SPL when the right condition
occurs. You'd probably get a very small increase in tweeter SPL if you removed
these. Those are 1N5348N 5W, 11V, zener diodes. Regarding Dynaudio, it can
withstand a 100 W of program power, not by itself. Thin voice coil tweeter
wire can't take much heat without being destroyed. This is a small tweeter
with not that powerful motor, so its SPL can't be very high. Manufacturer measured
close to 86-88 dB. Check the dcr, should be 5,6. Maybe the wrong XO values
additionally reduce the FR.
occurs. You'd probably get a very small increase in tweeter SPL if you removed
these. Those are 1N5348N 5W, 11V, zener diodes. Regarding Dynaudio, it can
withstand a 100 W of program power, not by itself. Thin voice coil tweeter
wire can't take much heat without being destroyed. This is a small tweeter
with not that powerful motor, so its SPL can't be very high. Manufacturer measured
close to 86-88 dB. Check the dcr, should be 5,6. Maybe the wrong XO values
additionally reduce the FR.
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I will measure it, but I think I got even lower DCR, like 3.3 ohm, making it a 4 ohm.
That was one criteria for picking it, 4 ohm dynaudio for a 4 ohm Emit-R swap.
Anyway its getting 5k and up from the values in the crossover if it is 4 ohm.
I don't think I'll get close to 100 watt for complete output anyway.
So you don't think removing the zeners will do any good ? I'll let it be then. I'd like to get it maybe 2-3 db so it matches the mid and tweeter.
Thanks.
Srinath.
That was one criteria for picking it, 4 ohm dynaudio for a 4 ohm Emit-R swap.
Anyway its getting 5k and up from the values in the crossover if it is 4 ohm.
I don't think I'll get close to 100 watt for complete output anyway.
So you don't think removing the zeners will do any good ? I'll let it be then. I'd like to get it maybe 2-3 db so it matches the mid and tweeter.
Thanks.
Srinath.
Oh, OK I have these 10uF's I pulled from something - nice audio grade, I'll swap that 8uF for the 10, and see if it needs more, then see if I can add 4.7's or some other.
IMHO it could use 6dB, if you ask my wife, she's want it to stay where it is. So I'd say 3dB is about where we'd both claim - its as far as we can take it.
Let me start on it if I can tonight and see what it does.
I have to hack something off the cover first, then maybe solder away.
Cool.
Srinath.
IMHO it could use 6dB, if you ask my wife, she's want it to stay where it is. So I'd say 3dB is about where we'd both claim - its as far as we can take it.
Let me start on it if I can tonight and see what it does.
I have to hack something off the cover first, then maybe solder away.
Cool.
Srinath.
Many forget that even if the woofer is straight wired, it *always* has an internal series inductor which cuts highs.
Relatively mild 6dB/oct and you can't choose the crossover frequency, you have what you have, but definitely attenuates highs and rises impedance ... exactly what an external series inductor does.
@Lojzek - The mid is a MD140/142 dynaudio.
I ran it in the Volvo crossover, where it made a good 4-6 db more than the other 2 in the same XO.I cant believe its so mid range heavy in the car.
I put it in the Infinity 5.1 XO and the mid toned down nicely, there is a 3.3 ohm resistor nicely taking it down to the level of the other 2.
The tweeter benefitted from your tip of the cap in addition to the other cap. Its good with spl just a db or 2 below the mid and sounds damn good.
The woofer is now cleanly slotted in for freq and for spl.
I think I may try to tone the mid down, maybe replace the 3.3 ohm with a 5 ohm, but its great as it is.
@JMFahey - you're talking about the coil's internal inductance with climbs as its frequency rises - which is why a Woofer isn't a full range speaker right ?
Anyway by ear, it sounds awesome, I have to finish the other speaker and may make new cabs etc etc for them, so far I've been boogering some old cabinets I got for $20.
Thanks.
Cool.
Srinath.
I ran it in the Volvo crossover, where it made a good 4-6 db more than the other 2 in the same XO.I cant believe its so mid range heavy in the car.
I put it in the Infinity 5.1 XO and the mid toned down nicely, there is a 3.3 ohm resistor nicely taking it down to the level of the other 2.
The tweeter benefitted from your tip of the cap in addition to the other cap. Its good with spl just a db or 2 below the mid and sounds damn good.
The woofer is now cleanly slotted in for freq and for spl.
I think I may try to tone the mid down, maybe replace the 3.3 ohm with a 5 ohm, but its great as it is.
@JMFahey - you're talking about the coil's internal inductance with climbs as its frequency rises - which is why a Woofer isn't a full range speaker right ?
Anyway by ear, it sounds awesome, I have to finish the other speaker and may make new cabs etc etc for them, so far I've been boogering some old cabinets I got for $20.
Thanks.
Cool.
Srinath.
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