mommjomma

what kind of response would you get using a woofer with a high qtc, lets say over .6 in a ported box, would this not yield a undesirable response

Dukk

Qtc is the combined response of the driver in the enclosure so did you mean Qts?

Using a driver with a Qts that high in a vented box is generally a bad idea. In fact, I would shorten that statement to: Using a driver with a Qts that high is generally a bad idea. Sounds like a large pro-sound midwoofer or an IB driver to me but I'm sure you have examples of automotive subwoofers with such a spec.

But then I did say all things being equal which would mean a driver with an EBP closer to 50, ie a driver that WILL work in EITHER a vented or sealed box. In this case I'll take, promote, build, and sell the vented enclosure every time. My apologies for being vague.

But of course you know what I'm talking about and are just trolling so congratulations, you got a bite..

Destarah

feel free to flame me if I am out of line here, but if saving space is a primary concern for this "temporary" box setup would it not make more sense to use a sealed box? The construction of the sub is such that it will perform well in a sealed or vented enclosure. Using recommended sizes, the vented box will literally be twice the volume of the sealed one.
BTW, for the OP ... have you tried a sealed enclosure in this vehicle? If not, why?

Dukk

^ Depends. The OP said they wanted a little more trunk. Losing one woofer already cuts the box in half. They also said they hoped to keep some loudness to it which the vented box will definitely deliver but I am concerned that a sealed one will leave them wanting.

Minimum space = minimum bass. IMO it is always better to offer up a little more space for better performance. In this case I would not run the HE2 in under 1cuft sealed or 1.5vented. It's worth the half cuft to vent it.

Destarah

I was looking at Crutchfield's "Ideal volume" which is 1.25 sealed and 2 vented. By the time you account for the port and extra bracing the vented will pretty much be twice the size. Also, I have always been curious about using vented for anything besides SPL. I don't really understand why a output hump at a certain frequency is desirable from an SQ perspective. Not that I believe flat curve = SQ, but a properly sized sealed can give extraordinary bass over the entire range right down into the 20s. Also, keeping in mind the temporary nature of the situation, the simplicity of building sealed has to count for something. Just thinking out loud ...

Haz Anga

I'm still looking for loudness, and the extra space that I'll get by removing one sub is enough space. I'll have the 2 cuft that is Ideal for the sub (that way It would work for most other 12" subs) and the 35Hz to make it still sound good. I've got my dimensions for the box and hopefully tomorrow will start cutting.
I've had a sealed box and I didn't like it, which is why i made my own ported box very shortly afterwards. I like the sound and the performance from a ported box and I don't care that a sealed box would be smaller, I'm already getting back more then 1/3rd of my space back.

Destarah

and that, as they say, is that
I hope the results are even better than you expect

Haz Anga

lol Thanks, I expect them to be better. I'm hoping that the fact that I'll be using one sub, with the same wattage as the 2 were using (still within the 100-400W RMS per sub) and it being one sub in a box. I notice that at high volume my subs will hit off... but very faintly, you have to sit and stare at them in order to notice it, and doesn't really do too much to the sound.

Dukk

I never use "recommended" enclosure sizes as they are generally not ideal for the driver. Most are vastly undersized but those seem on the biggish side.

Anyway. A vented box isn't much harder to build than sealed. It's a little bigger and has one more hole with a piece of pipe in it.

A vented box can and often does have more output down into the 25-30 bs range over a sealed box. Not much music information below that so I'll take the trade-off. Plus if you factor in that our hearing drops off as the frequency goes down, that low level bump can help make the bass sound more even.

Dukk

^ lol. Hz, not bs. Damned autocorrect and I can't fix it on my iPhone