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#403218 - 04/17/14 10:23 AM Re: Official v4 Subwoofer Thread [Re: dakkon]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: dakkon
Andrew.. I was thinking about getting 3 of the new amps, for my older EP-600's all of which are the ported enclosure design.. Will the new amps work ok with the older enclosures?


The new amp can be made to work, but it will not result in any improvement in performance. The DSP would simply be coded to be identical to what you have now.

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#403219 - 04/17/14 10:29 AM Re: Official v4 Subwoofer Thread [Re: MarkSJohnson]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: MarkSJohnson
Sounds exciting!

Thanks for the update, Andrew!

Will the pricing be the same?


Thanks Mark!

I believe the pricing will be increasing in line with the rest of v4 on April 23rd.

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#403220 - 04/17/14 10:36 AM Re: Official v4 Subwoofer Thread [Re: Crimson Wrath]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: Crimson Wrath
Why were sealed designs not considered until now? That was one of the main reasons why I did not go to Axiom for my sub woofers.


This is a difficult question for me to answer since I wasn't at Axiom when the original EP500 and EP600 were conceived. The EP400 and EP800 have, of course, always been sealed. Really my main focus in redesigning the subwoofer line was to identify areas where performance could be improved and then determine what would be required to achieve those improvements. New amplifier designs with far greater dynamic headroom and a new DSP engine then lead to the requirement for higher excursion woofers which then lead to the issue of port noise in the EP500 and EP600 at these new output levels. All of this together with the reduction in distortion by going sealed made the decision easy.

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#403221 - 04/17/14 10:40 AM Re: Official v4 Subwoofer Thread [Re: Adrian]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: Adrian
Looks like you guys have been busy, Andrew!!

Can you tell me/us what advantage there is in going to a dual chambre design on the EP800? does it increase cabinet pressure thereby reducing distortion vs a shared chambre?


The advantage has to due with the distribution of air pressure inside the cabinet and the interaction of the two woofers with this common volume of air. The separate chambers do result in higher absolute back pressures on each woofer than with a shared volume by removing this interaction. This then leads to a reduction in distortion at high output levels.

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#403222 - 04/17/14 10:45 AM Re: Official v4 Subwoofer Thread [Re: brwsaw]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: brwsaw
It will act as a co-located sub?
I just experimented with 2 pos subs and after stacking them the ceiling vibrates/resonates very very quickly (think blade of grass whistle).

Edit: The 800 would have been a beast before....


Technically it is close to two co-located subwoofers. You can think of it as being nearly equivalent to two stacked EP500v4s. The amplifier in the EP800v4 uses two dedicated channels, so only the shared power supply keeps it from truly being two independent subwoofers in one enclosure.

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#403223 - 04/17/14 10:57 AM Re: Official v4 Subwoofer Thread [Re: wschwartz]
Ian Offline
President
aficionado

Registered: 03/13/01
Posts: 796
Hi wschwartz,

The EP400 requires a lot more amp power to achieve the same output at 20 Hz compared to the EP500 and the added power has to start being added at a higher frequency. This means the EP500 will play louder lower than the EP400 even though the SPL achieved in the higher frequencies of each is not dramatically different. It is one of those things that falls in-between all the specs but matters in the real world. I think to achieve more clarity of the real world performance we should make the EP400 specs more conservative.
_________________________
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President & Chief Engineer

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#403225 - 04/17/14 11:54 AM Re: Official v4 Subwoofer Thread [Re: Andrew]
TroyD Offline
local

Registered: 02/17/04
Posts: 294
Originally Posted By: Andrew
Originally Posted By: brwsaw
It will act as a co-located sub?
I just experimented with 2 pos subs and after stacking them the ceiling vibrates/resonates very very quickly (think blade of grass whistle).

Edit: The 800 would have been a beast before....


Technically it is close to two co-located subwoofers. You can think of it as being nearly equivalent to two stacked EP500v4s. The amplifier in the EP800v4 uses two dedicated channels, so only the shared power supply keeps it from truly being two independent subwoofers in one enclosure.



So, what is the advantage of a EP800 over two EP500 's
or is the EP800 made for those that want the high volumn and low frequencies, but do not have the space to place two EP500 up front ?
_________________________
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M80 HG Cherry
2x Energy ESW10 Subs

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#403226 - 04/17/14 11:58 AM Re: Official v4 Subwoofer Thread [Re: fredk]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: fredk
Originally Posted By: Andrew
...and revised tuning/alignments....

Do tell. smile


Hi Fred,

The revisions centre around lowering tuning frequencies to take advantage of the larger cabinets (EP125/175) and the improved parameters of the new woofers. To give you an idea of the changes, I have attached the natural frequency response (no EQ) of the EP125v3 (in blue) and the EP125v4 (in green). There is an improvement of 5dB between 25Hz and 40Hz with the new alignment, meaning less EQ is necessary, resulting in much greater low frequency headroom.


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#403227 - 04/17/14 12:12 PM Re: Official v4 Subwoofer Thread [Re: TroyD]
Andrew Offline
Axiom Engineer
veteran

Registered: 12/18/01
Posts: 171
Originally Posted By: troyd
Originally Posted By: Andrew
Originally Posted By: brwsaw
It will act as a co-located sub?
I just experimented with 2 pos subs and after stacking them the ceiling vibrates/resonates very very quickly (think blade of grass whistle).

Edit: The 800 would have been a beast before....


Technically it is close to two co-located subwoofers. You can think of it as being nearly equivalent to two stacked EP500v4s. The amplifier in the EP800v4 uses two dedicated channels, so only the shared power supply keeps it from truly being two independent subwoofers in one enclosure.



So, what is the advantage of a EP800 over two EP500 's
or is the EP800 made for those that want the high volumn and low frequencies, but do not have the space to place two EP500 up front ?


The EP800 will have the edge in terms of maximum output if the 2 EP500s are going to spaced far apart from one another. The EP800 is also able to be EQ'd to a lower cutoff frequency (12Hz vs. 18Hz for the EP500) for those that demand reproduction of ultra low-frequency information. In many cases two EP500s spaced apart will result in a more linear in-room response. It really comes down to your preferences and the space you have available.

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#403229 - 04/17/14 01:09 PM Re: Official v4 Subwoofer Thread [Re: Andrew]
CatBrat Offline
axiomite

Registered: 08/05/09
Posts: 5802
Loc: Some random location
I'm assuming the freq graph for the EP500 is only an estimate and not an actual measurement. It looks too even.

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