1 Hz?

[tommyboy]

F1 freq responce: 38Hz - 23kHz +/-3dB

F2 freq resopnce: 39Hz - 23kHz +/-3dB

So, with an extra woofer, you get less bass????? Someone please clarify for me........... [*-)]

[jacksonbart]

F1 freq responce: 38Hz - 23kHz +/-3dB

F2 freq resopnce: 39Hz - 23kHz +/-3dB

So, with an extra woofer, you get less bass????? Someone please clarify for me...........

The bass measurements they report appear to be the same, its that the F2 goes higher. No doubt due to the differences in crossovers.

[artto]

There are a number of basic interrelated parameters that go into balancing any speaker design such as sensitivity (efficiency), distortion, frequency response, polar response and size. You can think of them as sort of a "five-way" teeter totter. Moving any one of them up or down moves the other parts in the opposite direction.

If you look closely at the specifications for the F1 and F2 you will notice that even though the F2 supposedly goes down 1Hz less than the F1 which has fewer bass drivers, the F2 sensitivity is 2.5dB higher (uses almost one-half the power), AND, the overall enclosure dimensions are also slightly larger. Since the F2 sensitivity is greater, I also suspect it’s distortion is lower since everything else appears to be essentially the same (the two bass drivers obviously contributing to greater output & lower distortion). The crossovers are the same and have nothing to do with the 1Hz difference in the lowest response (which under real world conditions will most likely be affected by the room more than anything else).

[Jay481985]

its the same with the rf-83 and rf63, actually the rf63 goes deeper but there is a bump in bass with the rf-83 that makes it percieved louder and deeper in bass.

[Ricci]

It also depends on the output levels. Lots of small single 5" or 6" bookshelf speakers claim 50 or even 40hz frequency response and they will probably do that at about 85db. Now compare this to a much larger tower speaker with larger multiple 6.5" or 8" woofers that may also be rated to only 45-40hz. On paper it looks like the bookshelf will have as much bass extension as the much larger tower speaker. I assure you that it will not. The bookshelf will get highly overdriven and distorted at anything more than a moderate drive level with bass that low. The tower will comfortably handle a much more spirited drive level in a cleaner fashion due to the larger cabinet, multiple drivers, etc. This is the same deal for the RF83 and RF63. The RF63 may have better extension at moderate volumes but the RRF83 will have a ultimately lower useable bass extension and output levels due to greater displacement capabilities.

[Trey Cannon]

All good points.

There are 2 numbers to look at here. Bandwidth and Low Frequency cutoff.

'Bandwidth' +/- 3 dB (1/6th Octave smoothed) referenced to System Sensitivity

This is the entire speaker spl, this number could be 90db

'Low Frequency Cutoff' figures are relative to Woofer Passband Sensitivity

This is the frequency range of the woofer only where the curve is "flat" This number could be 84db on the same speaker.

Now to answer you question. The F2 has a higher system sensitivity but rolls off about the same as the F1 @ about 12 db/oct.

So if the rate of roll off is the same and one has more output than the other the speaker with more output can have a lower low frequency number in the spec.