Posts by cjwhitehouse

The previous thread where we discussed this was here. See here for the effects of varying subsonic filter frequency and slope.

If you now compare that with what the SMS-1 plots, you will see there is very little difference. Theoretically, if the distance between the mic and the sub is very large, the 1ms/foot delay caused by the sound travelling from sub to mic...

Now let's apply 1/3 octave smoothing to that to approximate the smoothing that the SMS-1 does. Notice that the effect of the smoothing and the bass rolloff tend to push the 20Hz dip slightly to the left.

Now, with the EQ sliders at their default 1/3 octave positions, you pull down the 20, 32, 50 and 80Hz sliders to their maximum cut positions (default Q). Now to prove that these sliders act at the frequencies chosen, here is an...

Quote: Originally Posted by craig john How can I go about verifying that there is an issue with my SMS-1? At the risk of repeating myself from an earlier thread. If you take the EQ output from the SMS-1 and connect it to the LFE...

Quote: Originally Posted by jakeman . Some people call compression the silent killer but I've always felt that IMD is the more neferious killer of sound quality and the more difficult one to measure in subwoofers. IMD subwoofer ...

Quote: Originally Posted by soho54 I hate it when people delete posts, throws my count all off. :( JBLsound4645, love the enthusiasm. What kind of testing are you looking at doing exactly? Wires are crossed...

Yes, the ETF Spectrograms were all generated in the same way. WinMLS determines for itself the colour palette it is going to use for these plots. I suspect that there is a strong noise (out of the band shown) which has forced WinMLS to...

Make sure you ensure that both subs are running the same software version before any comparison as this can have a big impact on the performance. In those graphs that Steve C linked to at AV Talk, the DD18 was running an old version of...

And for the record, I run a pair of DD-18's. :cool: