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?
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?
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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
Regards,
SS
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.
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.
Cheers,
Matt.
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.
Finding 4 good 2245H`s would be a bit trouble some tho.
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
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.
I can't fit larger than 12 inch and changing the size of the enclosure is to messy.
What you need are proper sub drivers, not just standard bass drivers.
Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohm Per Coil
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?
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