New sub replacing 2x30w54 in a 500ltr vented box

[A 8]

Many years ago I built everything myself including the low end in my system which is two in-wall built vented boxes at 500ltr each and two Dynaudio 30w54 in each enclosure.
In many ways they still sound great with a simulated -3db at 17Hz even though they actually, in room measure straight down to 10hz using REW and UMIK-1, not sure that's true but subjectively they go crazy deep and still clean at the really deep end.

I have a couple of issues though and the first being that they bottom out or play paper as I say and with my new Emotiva XPA gen 3 power amp, it’s obvious they can't take the power (which I knew designing it but power has become less expensive and with room correction it stresses things)
Also the upper(ish) bass is a bit boomy and not as tight/clean as I would want so I have started to think I need new drivers.

Problem is I've lost touch with what's good these days and hoping to get help or ideas what I could replace the four 30w54 units with.

I can't go much bigger than two 12 inch (maybe 13) but I could potentially make place for 6-8 6.5 inch speakers if that would give me any benefits.
Power is not an issue nor is cost, I just want to make it as good as I can given the vented enclosure.
Ideally still a bit under 20Hz and linear up to 140dB @ 20hz (not sure that's possible) with a tight and clean usable range up to 200Hz.

Suggestions or ideas anyone?

 

[Sub Sonic]

Have you tried a high pass to see if that controls excursion and gives you more SPL? Perhaps something around 20-25Hz to start with? Alternatively, some judicious compression dialed in with something like a Minidsp may help.

Regards,

SS

 

[A 8]

I have not but have experimented with a complete dc coupled path to the subs and find that makes a big difference in how solid and defined the low end is so I don't think I would like the sound if I cut at 20hz or there abouts.

 

[Sub Sonic]

Is there a possibility of reducing volume in your fairly large enclosures? It would be worth a look at Rythmik’s DIY direct servo subs, possibly the 15” vented versions. I have the 12” sealed versions and they go low, loud and clean. How loud the 15” versions would go will depend on your room.

Cheers,

Matt.

 

[FE3T]

Well, you have the volume for 4pcs JBL 2245H`s, tune to 25-26hz, add some eq at the same frequenzy and a 20hz hp filter and you should have all the lows you would ever want.


Finding 4 good 2245H`s would be a bit trouble some tho.

 

[freddi]

had a pair in isobarik box - with coil length 17mm and gap height of 10mm, they bottomed out at very low spl. - box (Audio Concepts) had to be too big and probably set for very low qts

 

[A 8]

I found speakerbuilder pro on the web and simulated a few newish elements and it seems I get similar issues, there is just no way I can combine sub 20Hz frequency response and get within x-max at 20Hz with 150w per speaker on any of the options I found, I was way over on all and the difference was not that big vs the 30w54 I have.

I can't fit larger than 12 inch and changing the size of the enclosure is to messy.

 

[A 8]

The best option I found was SB Accustics SB34NRX75-6 and get this, 150w

 

[5th element]

What you need are proper sub drivers, not just standard bass drivers.


Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohm Per Coil

 

[A 8]

What you need are proper sub drivers, not just standard bass drivers.


Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohm Per Coil

Very true and thanks for that, with them I can push 250 watts and still be within xmax at 17hz, -3 db is around 15hz, perfect.

Group delay is not that good, not worse than my current ones. Not sure how much it matters, anyone have a view on that?