minimum Frequency response

[zinblade19]

I'm planning a bass reflex for a full range driver which has a stated minimum frequency response of 51 Hz. However, my cabinet has a resonance frequency of 38. As such the system should produce 40hz @-3db.
Now my question is : would the driver produce frequencies below its minimum frequency response in this enclosure??

[Geek]

Hi,

Bass reflex enclosures cutoff far more rapidly than sealed, but give deeper response.

As for getting more bottom end below cutoff, that depends almost entirely on room gain and resonance, in my experience.

Cheers!

[HareBrained]

If you mean the Fs=51Hz, by tuning the cabinet that significantly lower will decrease the power handling of the driver. It will reach xmax sooner than you may want and as such will decrease the potential SPL. Not an issue for nearfield. If this is a BLH, the horn will recover some of the db but power handling is still limited.

[zinblade19]

'min frequency reproduced: f0-16k'
how much(/what)
is this f0?

[planet10]

f0 = Fs

Is the cabinet you intend to put the driver in designed for the driver?

dave

[rjbond3rd]

Originally posted by zinblade19 ... would the driver produce frequencies below its minimum frequency response in this enclosure?? [/B]

I don't think "minimum frequency response" really means much since frequency response is a curve.

Below a cab's cutoff, the response drops at 24db/octave. So not much output below cutoff, but nor should you feed it anything below its cutoff, because the cone will be undamped (and damage could result).

You might want to download one of the many free bass reflex cab calculators out there, to try out some scenarios. (Personally, I would not tune a cab below the driver's Fs but I am a newb.)

[planet10]

Originally posted by rjbond3rd
Below a cab's cutoff, the response drops at 24db/octave.

True only with unassisted systems with undamped holes in the box.

Sealed is 12 dB/octave

Assisted means an filter - passive or active -- that changes the rolloff -- most often increasing the order, but some, like the bag-end subs, decrease the rolloff (in the case of the BagEnd to flat) below the natural system rolloff.

Aperiodic (damped port, can vary between 2nd & 4th order)

dave