Hello. I have a spare 15" subwoofer laying around which should be pretty good. It's an Hertz ML3800 and I want to use it to make a sealed subwoofer for my car. Its specs can be read here.
I already have a Boston Audio Rally RS10. Specs here. This existing subwoofer is housed in a 18 liters sealed enclosure.
I don't need any DSP for this woofer in this enclosure to make it work. It's only lowpassed at 100Hz with a 4th order LR filter. It goes down to 20Hz flat inside my car.
It sounds really good, but I was wondering if it would make sense to upgrade to a larger woofer since I already have it. To my understanding I should benefit from a lower distortion and higher max SPL.
But the parameters for the ML3800 aren't very good for sealed, it's more of a bass reflex woofer. They are typical for a PA woofer with a somewhat high Fs due to the very stiff suspension, very high Qms and low Qes.
Many people use this kind of woofers in a small sealed enclosure (or into an open baffle) and then apply a Linkwitz transform on the signal to improve the response. It seems it works pretty good, but it isn't clear to me if the result is comparable to using a woofer that already has the right parameters for a sealed enclosure, if it makes sense to "force" a bigger woofer into a small enclosure (the 15" would be enclosed in a 20l box which leads to a Qtc of about 1) and then use EQ to correct it or even if it would make sense to switch to that when compared to my 10 inch Boston sub.
Of course all the adjustements will be made with a measurement microphone because cabin gain plays a huge role at those frequencies.
This thread seems to suggest that it should make any difference whether I use a low EBP woofer or this one and EQ, but I am not sure.
I already have a Boston Audio Rally RS10. Specs here. This existing subwoofer is housed in a 18 liters sealed enclosure.
I don't need any DSP for this woofer in this enclosure to make it work. It's only lowpassed at 100Hz with a 4th order LR filter. It goes down to 20Hz flat inside my car.
It sounds really good, but I was wondering if it would make sense to upgrade to a larger woofer since I already have it. To my understanding I should benefit from a lower distortion and higher max SPL.
But the parameters for the ML3800 aren't very good for sealed, it's more of a bass reflex woofer. They are typical for a PA woofer with a somewhat high Fs due to the very stiff suspension, very high Qms and low Qes.
Many people use this kind of woofers in a small sealed enclosure (or into an open baffle) and then apply a Linkwitz transform on the signal to improve the response. It seems it works pretty good, but it isn't clear to me if the result is comparable to using a woofer that already has the right parameters for a sealed enclosure, if it makes sense to "force" a bigger woofer into a small enclosure (the 15" would be enclosed in a 20l box which leads to a Qtc of about 1) and then use EQ to correct it or even if it would make sense to switch to that when compared to my 10 inch Boston sub.
Of course all the adjustements will be made with a measurement microphone because cabin gain plays a huge role at those frequencies.
This thread seems to suggest that it should make any difference whether I use a low EBP woofer or this one and EQ, but I am not sure.
Given the specs you quote, the advantage is it’s likely far more efficient so the LT circuit balances out the efficiency by crushing the response peak. The small box will keep excursion in check And as you mentioned , you’ve already got the cabin gain to take care of the bottom end. Louder is louder…..go for the efficiency.
