The worry is not the amp failing and sending DC to the tweeter, it's the operator having a brain fart and disabling the crossover to the tweeter amp, or accidentally swapping the signal cables between the DSP and the woofer/tweeter amps, or unexpected impulses such as a bad signal connection or equipment suddenly losing power, causing loud pops and bangs to be sent to the tweeter. I've also had a case of a MiniDSP having it's memory randomly corrupt after several years of constant use... Luckily the MiniDSP just booted up with the outputs disabled, not sure if that is by design or just good luck.
I run a single series capacitor with each of my tweeters. Highpass frequency due to the cap is circa 300Hz. The effect is essentially inaudible given my tweeters cross at 2kHz. You can run fancy poly-put-the-kettle-on caps if it makes you feel better (but it won't make a difference 🙂)
Will it prevent them blowing up if I run my DSP fullrange into the tweeter amps and crank the volume to the max? Probably not, but it at least will take the very low frequency content out of unexpected impulses, giving the tweeters a good chance of survival.
In the event you use a DSP controlled high-pass filter for a tweeter (with a protection capacitor a couple octaves down from crossover let's say). And you accidentally send a full range signal due to a DSP error is there any range between "something sounds funny I should check this out" and "my tweeter has been destroyed"?
That decision would be easier it we knew what kind of tweeter you are using.
Regards
Charles
Haven't started my active adventure yet but one set of speakers I have has a Scanspeak D2010 the other set I intend using has a Seas 22TAF/G H1283-06
I am thinking of stepping into the active crossover world as I just do not have the know how and limited electrical experience of the best designers out there to even attempt building a crossover to suit my needs.
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It might be worth considering a 6 channel DSP in case you decide to build a 3 way pair of speakers or add subs at a later date.
Yes. I'd lean toward the $150 Dayton DSP-408 once they get them back in stock.
4 channels for two-way speakers.
3 channels for subwoofers, or one sub and two surround.
One channel for center channel (single spoken voice speaker for movie dialogue.)
Regarding small rooms and not-painful listening levels,
DSP + individual amplification will allow you to use less expensive tweeters and woofers by mitigating manufacturing quality control issues. Also, there's a point where you can get a better frequency response graph but you can no longer hear the difference. Especially when you have adult ears that can't hear a tweeter generating a flat frequency response above 16,000Hz. All you're doing at that point is hurting your dog's ears.
Pretty great benefit of going with DSP + individual amplification.
DSP + individual amplification will allow you to use less expensive tweeters and woofers by mitigating manufacturing quality control issues. Also, there's a point where you can get a better frequency response graph but you can no longer hear the difference. Especially when you have adult ears that can't hear a tweeter generating a flat frequency response above 16,000Hz. All you're doing at that point is hurting your dog's ears.
Pretty great benefit of going with DSP + individual amplification.
I assume we've all sent full range to tweeters, done full sweeps at high levels and all that.. Not having to hear it unexpectedly is worth something. 🙂And you accidentally send a full range signal due to a DSP error is there any range between "something sounds funny I should check this out" and "my tweeter has been destroyed"?
Can anyone give me an idea of what to search for on ebay for a capacitor I should use on a tweeter then when I plan to run active crossovers?
Opened another one my speakers today my epos es11s as these are crossover-less designs which basically don't use any apart from tweeter protection. Thought it would give me an idea of what was being used in there.
Going on the specs of the epos one is this the same type and would it be sufficient ?
EPCOS - B32522C1155K - CAPACITOR, 1.5UF, 100V | eBay
Also why is there a resistor on the negative terminal to positive after the capacitor, is that important as well? Why did epos do that?


Opened another one my speakers today my epos es11s as these are crossover-less designs which basically don't use any apart from tweeter protection. Thought it would give me an idea of what was being used in there.
Going on the specs of the epos one is this the same type and would it be sufficient ?
EPCOS - B32522C1155K - CAPACITOR, 1.5UF, 100V | eBay
Also why is there a resistor on the negative terminal to positive after the capacitor, is that important as well? Why did epos do that?


Well be shure to trim the amps down to your max listening level, to get max bit depth and unnecesary faul play accidents.
The resistor is probably there to reduce the effect of the varying impedance.
A capacitor value has already been suggested. If it were me, I'd probably aim for a smaller value but then that would involve some investigation, some simming, some knowing what to look for. On the other hand you could home in on a value in normal use, as you measure and apply filters.
A capacitor value has already been suggested. If it were me, I'd probably aim for a smaller value but then that would involve some investigation, some simming, some knowing what to look for. On the other hand you could home in on a value in normal use, as you measure and apply filters.
Thanks everyone for the responses. I came across a video on line as well which if there was any the slightest doubt there is no longer. If anyone else was unsure of exactly how to determine capacitor size for tweeter protection, its here.
https://www.youtube.com/watch?v=hscMuzfyxQ4
Can anyone give me an idea of what to search for on ebay for a capacitor I should use on a tweeter then when I plan to run active crossovers?
I'd just buy through Blue Aran. Wide range of decent poly caps, sensible prices.
Chris
Thanks everyone for the responses. I came across a video on line as well which if there was any the slightest doubt there is no longer. If anyone else was unsure of exactly how to determine capacitor size for tweeter protection, its here.
https://www.youtube.com/watch?v=hscMuzfyxQ4
Car audio guys seem to be really good at making explainer videos.
I'd just buy through Blue Aran. Wide range of decent poly caps, sensible prices.
Chris
I will cheers Chris
Car audio guys seem to be really good at making explainer videos.
Yes he did a grand job there.
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