I have some QRX218s subs which, unknown to me when I bought them.. and even though I was assured that they had the original drivers in them.. at least one of them has Eminence Omega Pro 18A drivers, not the EVX180B (or A) that is supposed to be in there. Needless to say I am ticked off. But so it goes.
Anyway, one of the Omega's has now failed and now the question is, what to do now?
I have some 18Sound 18LW1400 drivers in other boxes I am not using. They have low enough Fs (31hz vs 28Hz for the EVX), the Qts is very close at 0.29 (EVX=0.28). BUT, the Vas is significantly different, the 18LW1400 is 297.0 liters (10.49 ft3) and EV is 416 liters (14.7 ft3).
How significant will that difference be in the QRX218S enclosure?
I need to get the box back in business by Thursday morning, even I have to do something short term and then come up with a long term plan later...
So the most obvious choice is to replace both drivers in the box with the 18Sound drivers which I have handy, IF they will perform well in there. Or at least pretty well.
And yes not all the subs have these Eminence drivers in them, at least half of them have the correct driver.. so I've been running mismatched drivers all along not knowing it... So that I will be running at least one box with different drivers than the rest, with the phase issues that brings, is something I am going to have to accept for the moment...
Or I could overnight a recone kit for the Eminence.. it's fairly inexpensive.. just to get me by for a few more gigs until I have had more chance to decide what to do. After all, those drivers managed to fool me for quite a while, so I know what I'm dealing with there. Amazed I did not break one sooner, I've been low passing at 35Hz, Omega 18a Fs=40 Hz, Xmax only 4mm...
I'm pretty experienced in sound and electronics but when it comes to enclosure design I'm a beginner.. so please be gentle... Thank you!
Anyway, one of the Omega's has now failed and now the question is, what to do now?
I have some 18Sound 18LW1400 drivers in other boxes I am not using. They have low enough Fs (31hz vs 28Hz for the EVX), the Qts is very close at 0.29 (EVX=0.28). BUT, the Vas is significantly different, the 18LW1400 is 297.0 liters (10.49 ft3) and EV is 416 liters (14.7 ft3).
How significant will that difference be in the QRX218S enclosure?
I need to get the box back in business by Thursday morning, even I have to do something short term and then come up with a long term plan later...
So the most obvious choice is to replace both drivers in the box with the 18Sound drivers which I have handy, IF they will perform well in there. Or at least pretty well.
And yes not all the subs have these Eminence drivers in them, at least half of them have the correct driver.. so I've been running mismatched drivers all along not knowing it... So that I will be running at least one box with different drivers than the rest, with the phase issues that brings, is something I am going to have to accept for the moment...
Or I could overnight a recone kit for the Eminence.. it's fairly inexpensive.. just to get me by for a few more gigs until I have had more chance to decide what to do. After all, those drivers managed to fool me for quite a while, so I know what I'm dealing with there. Amazed I did not break one sooner, I've been low passing at 35Hz, Omega 18a Fs=40 Hz, Xmax only 4mm...
I'm pretty experienced in sound and electronics but when it comes to enclosure design I'm a beginner.. so please be gentle... Thank you!
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