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#318609 - 08/14/10 11:14 PM Re: Sub Thoughts [Re: AndrewSW]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
The PB12 has a bump in the frequency response around 50 - 60hz, which I found a little annoying as it made the sub sound more like a car subwoofer. The EP500 has DSP that smoothes out the frequency response for a linear/flat playback, just nice and smooth sound reproduction through the range. The DSP also limits the output making port noise nearly nonexistant on the 500,
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#318612 - 08/14/10 11:31 PM Re: Sub Thoughts [Re: jakewash]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7786
Loc: Canada
Quote:
The PB12 has a bump in the frequency response around 50 - 60hz, which I found a little annoying as it made the sub sound more like a car subwoofer.

One of the compromise tricks uses to give a sub more slam and apparent bass because it does not have the real low stuff for movies.

Jay. Its interesting that you now prefer the EP500. I believe that extra texture you like is actually harmonic distortion. Ilka's measurements clearly showed that there is quite a bit more distortion in the EP500/600 than the PB13. It is also interesting just how subtle everyone finds the difference.
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#318648 - 08/15/10 02:30 PM Re: Sub Thoughts [Re: fredk]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10415
Loc: Calgary, Alberta
I know it is harmonics that adds that texture. I have always liked Axiom's sound on their subs, even before my SVS purchase. I seem to remember Ian mentioning at one time that he designs the subs to have some harmonics, where as most of the others try to eliminate it. I liked how Ilka mentioned the harmonics then went on to say it didn't sound bad.
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#318688 - 08/15/10 08:36 PM Re: Sub Thoughts [Re: jakewash]
MP3DFX Offline
regular

Registered: 08/05/10
Posts: 7
Loc: Milton, Ontario
If I may add 2 cents...(for noobs like me)

When reading above, I was thinking that the harmonic distortion was a bad thing, I did some googling and found this
Quote:
One woofer backwards. This design reduces harmonic distortion. The main cause of harmonic distortion in woofers is the difference between the out-stroke and the in-stroke of the woofer. This difference is caused by magnetic anomalies around the voice coil, manufacturing errors and suspensions that are stiffer moving in than out. When you mount one woofer backwards, but wire them up so that they both move in the same direction, the sound from the two woofers reinforce each other (in phase) while the distortions cancel each other out (out of phase). Clever, but the value is less than one might think. Not only are humans insensitive to harmonic distortion in the bass region, harmonic distortion by nature is, you guessed it, harmonious. So not that unpleasant.


original link
http://www.aperionaudio.com/aperionu/how_subs_work.aspx

So I guess it's ok then.
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#318689 - 08/15/10 09:36 PM Re: Sub Thoughts [Re: MP3DFX]
grunt Offline
connoisseur

Registered: 12/04/06
Posts: 3569
Loc: Nirvana
Thanks for the link. That’s a very nice and concise explanation. All things considered I still prefer a tactile transducer for the very low bass. A subwoofer for the low bass and the mains for the mid and upper bass. Just my opinion. Though I am still considering a mid bass module for restoring the chest thumping I was use to when I sat closer to my M80s.
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#318690 - 08/15/10 09:39 PM Re: Sub Thoughts [Re: grunt]
AndrewSW Offline
buff

Registered: 02/28/06
Posts: 46
I'm curious to hear what Axiom subs sound like. Anyone in NW Arkansas that has one?


Also, would I benefit from an EP800 & an EP500 in the same room?
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