Turbosound IQ8 BIG FAIL!
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- Опубликовано: 25 авг 2024
- This is what happens when an amplifier with a peak power of 4000 watts is loaded onto a speaker with a paper cone! I don't know if the speakers have been changed in these acoustic systems, but they look like the original ones!
They brought me two turbosound speakers for repair. They said they were very good, but something happened to them, they made a strange sound. I checked them and indeed, the sound is very strange. I dismantled it from the side of the amplifier, checked the amplifier, everything seems to be fine, it plays. I began to check the speakers and here they are! Who is deceiving whom here, I don’t know, maybe these are not the original speakers, but I did not find any traces of replacement. From the back they look very similar. But the material from which the cone is made cannot possibly withstand the power of this amplifier!
I have a pair of iq 12 and they are excellent. I think you exceeded your power. The speakers are excellent but obviously they have their limit and you exceeded it.
Когда я все это ломал давно - не было таких видео.
Man how do you take off the grill to gain access to the front of the speaker?
You remove the screws and just pop the grille out. You'll have to use force!
It's nowhere near 4000w. Nor 2500w. The amp is basically a design they "borrowed" from the original QSC K series & KW series. It's a 250 watts RMS per channel x 2 channels design that then gets reduced down to a reasonable value for the size of the driver by the DSP. The DSP has a different firmware load for each of the sizes - 8", 10" 12" and 15". The horn side might get 75 watts or so, and the 15" model would probably get nearly the full output of the amp, theoretically with limiting and excursion protection. The 8" model would be significantly less than the full output of the amp. To be clear, I'm not dunking on the amp design, it's quite decent really. It's the absurd power claims from all manufacturers that have only ramped up as times goes on. This is most likely a case of liquid damage, or of accidental over-excursion from some input signal that the DSP didn't catch in time. Or a manufacturing defect. The blue frame of the driver would indicate a Turbosound original driver was installed, as opposed to a 3rd party replacement. Or maybe it was a bad re-cone job using the original frame. I guess we'll never know.
Thank you very much for your clarification! I wonder how fast the DSP works? Can it limit the powerful wavefront of the input signal when the jack is plugged into the source with the hardware fully engaged and at maximum volume? Too bad these speakers were taken away quickly and I don't have the opportunity to do more research.
@@fixingmania Tough to say... all these companies presumably have different algorithms for protecting the drivers. It's definitely not "open source software", and I've never found any hacked decodes of DSP firmware, so maybe they encrypt it (Sony encrypts camera firmware). I've seen how excursion is calculated & checked in circuit, but that is something that is very dependent on the specific driver (check speaker specs for x-max), which is why I do not recommend installing 3rd party replacements in DSP controlled powered speakers. If the replacement has a lower x-max than the original, then the DSP will not protect it. Conversely, if the replacement has higher x-max (& power handling), you might not ever get the full potential out of the cabinet after that.
My own experience with high volume live performances is with QSC, EV, Peavey, Behringer and Meyer (in no particular order - lol). Of them, the Behringer does not have a DSP, although it does have limiting & overcurrent protection. They are the most lackluster of the lot for sure in terms of protection. I've never had an issue with them, but then again, I have a lot of years of experience in live sound, and I can feel & hear when the system is on the edge. Some people can't.
Anecdotally, I'd say that QSC & Meyer handle the situation well. I've had an assistant mis-set switches and run a KW152 all night in full range mode while it was paired up with subs (running hard at a metal show), and should have been in EXT SUB mode. I know it was in limit all night because I did the exact same band / show the following weekend, and had a WTF moment during setup as I walked around the back of the speaker & saw it lit up solid red. Interestingly, it didn't sound bad, or distorted, so clearly the DSP was doing it's job. I've also seen QSC CP8's go to limit when pushing hard as mini floor monitors, and same story - no damage, no distortion. I work at a venue that uses Meyer, and holy hell, we've had some bands come in that were nearly impossible to reign in their volume. I've seen the tops and subs go into limit, but never had any issues either.
But as I say, anecdotal because I know what the gear is capable of, and I try not to mis use it, and I can't really afford to blow things up for fun. In theory, an electronic circuit can respond an order of magnitude faster than an electro-mechanical device (speaker), so excursion protection should always work. The fact that drivers blow and replacements are available says that theory is not equal to practice.
Been using them for 5 years no problem! I think this is human error!
Would i be easier to put in a proper speaker? Do you have a spec on a replacement one?
This is a very simple procedure. Speakers are for sale. The original ones have wavy cones. The client took his speakers. It will probably change on its own.