The two V models are vented, all the others are sealed. The F15HP and E15HP share the same amp and driver, but the F has slightly more output (0.5dB) because of it's slightly larger enclosure. The FV15HP also has the same amp and driver, and because of it's vented enclosure has more output around it's tuning frequency (16hz?) than the sealed models (except maybe the F25). Below that frequency, it's output drops off more rapidly than do the sealed subs (6dB and12dB/octave respectively, I believe). So at very low frequencies the sealed models end up having higher output than the vented. But that is so low in frequency, and our ears are so low in sensitivity down there, that you probably won't hear that difference. The real value of vented subs is in large rooms, where sealed subs don't benefit from the room gain that small rooms provide them. In large rooms (larger than somewhere around 4,000 ft3 or so), employing sealed subs requires you to have more of them to get the same output as vented subs. What is the volume of your room? That's the first consideration in choosing between subs. Vented and sealed are two different animals! Feel free to correct me, more technically informed readers!
Quote:
Originally Posted by mijotter /t/1214550/official-rythmik-audio-subwoofer-thread/15150#post_24632395
What is the difference(if any) between the F15HP and the E15HP. How do they compare to the FV15HP?
I have the LV12R right now and am very happy with it, would either of those be significantly better?
Thank you.
Also, would setting the distance of the sub in AVR help with the null at my MLP?
The two V models are vented, all the others are sealed. The F15HP and E15HP share the same amp and driver, but the F has slightly more output (0.5dB) because of it's slightly larger enclosure. The FV15HP also has the same amp and driver, and because of it's vented enclosure has more output around it's tuning frequency (16hz?) than the sealed models (except maybe the F25). Below that frequency, it's output drops off more rapidly than do the sealed subs (6dB and12dB/octave respectively, I believe). So at very low frequencies the sealed models end up having higher output than the vented. But that is so low in frequency, and our ears are so low in sensitivity down there, that you probably won't hear that difference. The real value of vented subs is in large rooms, where sealed subs don't benefit from the room gain that small rooms provide them. In large rooms (larger than somewhere around 4,000 ft3 or so), employing sealed subs requires you to have more of them to get the same output as vented subs. What is the volume of your room? That's the first consideration in choosing between subs. Vented and sealed are two different animals! Feel free to correct me, more technically informed readers!