Oops, wrong channel! Switching to the Medium mode – no spirits were harmed in the correction! 😃I stand corrected. Forget the ouija board: call in the Medium!
Math in msg #4 is off. Simply, 8ohm driver high-pass frequency (-3dB point) is 20khz/uF which differs from the 1/2pi official formula by half a percent, much lower than typical part tolerance of several percent. 20khz/2.2uF ~ 9khz.
HPF ~ (160khz/ohm)/uF
LPF ~ (160hz*ohm)/mH
HPF ~ (160khz/ohm)/uF
LPF ~ (160hz*ohm)/mH
https://www.diyaudio.com/community/threads/my-amplifier-suddenly-turned-off-now-nothing.407727/
If anyone knows anything about the above issue let me know
Thanks
If anyone knows anything about the above issue let me know
Thanks
Update:
I went to the market and found the following available products:
All of these are currently in stock. Which combination would you like to me to go with?
I went to the market and found the following available products:
- 2.2uF capacitor, 250V
- 3.3uF capacitor, 100V
- 8-ohm tweeter
- 4-ohm tweeter
All of these are currently in stock. Which combination would you like to me to go with?
Well, none of that tells us anything of any use whatsoever. So the only logical answer is -whatever. The cap values are what they are, the voltage ratings are fine for loudspeakers, the tweeters are almost certainly utter junk if that's all you are able to tell us about them, so it probably won't make any difference what you do outside of 'random experimenting'.
As for 'what we would like you to go with', 'we' aren't the ones buying or listening to it, so it's not for us to like you to go with anything. However: I suspect, as I said above, that most of us are sincerely wishing that you'd actually bother to read and make some attempt at understanding the advice and information that you've been told over the various threads you've started. Because we'd all like you to succeed in what you're doing, but to date, it seems you're not bothering to do that.
Tough 'love' now: so far, it's been drivel, man. You're wasting your time. Using very cheap gear as something to experiment with is a good way of saving money on testing & learning -but it's only worth doing if that's what you're doing: trying to learn something. If you're not using it for that, but simply wanting to make improvements to existing gear, then you need to do it properly if you want to get a real benefit, or at least stand a high-odds chance of succeeding rather than trusting to chance. Which doesn't mean flailing around buying random junk off Aliexpress / whereever. If this is your objective, do yourself a major favour: save your money, and get some quality units for a proven, quality design, or buy a proven, quality kit once you've got enough funds stashed. This doesn't have to be expensive: there are some very good designs out there using inexpensive drive units. Just do the research first and make sure you follow a one from a designer with a good reputation. You'll be a whole lot better off in the long run than ramming rubbish into recyled midi-system boxes at random & hoping for the best, which is basically what you're doing right now.
As for 'what we would like you to go with', 'we' aren't the ones buying or listening to it, so it's not for us to like you to go with anything. However: I suspect, as I said above, that most of us are sincerely wishing that you'd actually bother to read and make some attempt at understanding the advice and information that you've been told over the various threads you've started. Because we'd all like you to succeed in what you're doing, but to date, it seems you're not bothering to do that.
Tough 'love' now: so far, it's been drivel, man. You're wasting your time. Using very cheap gear as something to experiment with is a good way of saving money on testing & learning -but it's only worth doing if that's what you're doing: trying to learn something. If you're not using it for that, but simply wanting to make improvements to existing gear, then you need to do it properly if you want to get a real benefit, or at least stand a high-odds chance of succeeding rather than trusting to chance. Which doesn't mean flailing around buying random junk off Aliexpress / whereever. If this is your objective, do yourself a major favour: save your money, and get some quality units for a proven, quality design, or buy a proven, quality kit once you've got enough funds stashed. This doesn't have to be expensive: there are some very good designs out there using inexpensive drive units. Just do the research first and make sure you follow a one from a designer with a good reputation. You'll be a whole lot better off in the long run than ramming rubbish into recyled midi-system boxes at random & hoping for the best, which is basically what you're doing right now.
Last edited:
ComponentTweeter
Size mm (in.)26 (1)
Power Handling - Peak W120
Power Handling - Peak Note(Hi-Pass filtered @ 2,5kHz - 12 dB Oct.)
Impedance Ohm4
Voice Coil Ø20(0.8)
Frequency Response Hz1.8k ÷ 22.5k
Magnet size D x d x h mm (in.)19 x 0 x 3 (0.75 x 0 x 0.12)
Weight of one speaker kg (lb.)0,04 (0.08)
MagnetNeodymium
DomeTetolon
D mm26
Re Ohm3,7
Fs Hz1500
Le mH0,02
Vas I-
Mms g0,17
Cms mm/N0,07
BL T*m1,3
Qts1,6
Qes3,5
Qms2,9
Spl dB92
Size mm (in.)26 (1)
Power Handling - Peak W120
Power Handling - Peak Note(Hi-Pass filtered @ 2,5kHz - 12 dB Oct.)
Impedance Ohm4
Voice Coil Ø20(0.8)
Frequency Response Hz1.8k ÷ 22.5k
Magnet size D x d x h mm (in.)19 x 0 x 3 (0.75 x 0 x 0.12)
Weight of one speaker kg (lb.)0,04 (0.08)
MagnetNeodymium
DomeTetolon
D mm26
Re Ohm3,7
Fs Hz1500
Le mH0,02
Vas I-
Mms g0,17
Cms mm/N0,07
BL T*m1,3
Qts1,6
Qes3,5
Qms2,9
Spl dB92
Attachments
If that question is directed at me, I have already given my preference in post #13: 4.7 uF with 4 ohms or 2.2 uF with 8 ohms.
I suspect that you are either incapable of absorbing information or that you are getting a kick out of taking us around in circles by ignoring our advice and simply repeating the same questions over and over again within the same thread or even across multiple threads.
If you continue in this fashion, the experts in this forum will soon tire of being misled and your posts will be ignored.
Attachments
Note that two of those in parallel will give 4.4 uF which will be perfect for a 4 ohm tweeter.
Or use just one on its own if you go for an 8 ohm tweeter.
It depends on the sensitivity of the 8" driver, and at what frequency it falls off. The high-passed (92dB?) tweeter needs to fall enough but not too much. If the 8" is close to 90dB then 8ohm tweeter might be better; otherwise 4ohm tweeter will be filtered more, to match the 8" better. In either case, buy a bunch of different small caps to test -- they are cheap! Also a bunch of small resistors (for the tweeter) if the 8" falls off too quickly AND is much less sensitive than the tweeter. Given how little we know of the 8" not much can be said with any confidence.
Great advice! 👍
Unfortunately, as evidenced here and in his other threads, the concept of testing with different components appears to be alien to Kamranbits.
He has been schooled elsewhere on attenuating resistors and even 2nd order crossovers, but he seems to love us so much that he just wants to spin the discussions out!
Absolutely! We have no specifications for the replacement Aiwa woofers that Kamranbits randomly fitted in his Kenwood enclosures.
The blown 4 ohm tweeters in the Kenwoods were filtered by a 3.3 uF capacitor and he could continue to use such a combination should he so wish - in fact, he can't seem to let it go!
The entire discussion is simply a waste of time. All talk and no action on Kamranbits's part.
Tested
with 2.2 and 3.3 uf capasitors
8ohms tweeter
4 ohms tweeter
With 3.3 uf and 4ohms tweeter vocals are little harsh
With 2.2 and 8ohms tweeter vocals are soft
So 2.2 and 8 ohms exact match for me
@Galu i find it amusing that you think I'm alien to testing components. Rest assured, I'm well-versed in attenuating resistors and 2nd order crossovers. But I'm game for spinning discussions – adds a bit of flair, don't you think?
@wchang Thank you for your valuable advice and information. I appreciate it
with 2.2 and 3.3 uf capasitors
8ohms tweeter
4 ohms tweeter
With 3.3 uf and 4ohms tweeter vocals are little harsh
With 2.2 and 8ohms tweeter vocals are soft
So 2.2 and 8 ohms exact match for me
@Galu i find it amusing that you think I'm alien to testing components. Rest assured, I'm well-versed in attenuating resistors and 2nd order crossovers. But I'm game for spinning discussions – adds a bit of flair, don't you think?
@wchang Thank you for your valuable advice and information. I appreciate it
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