| zeus_threat |
I would like an advice on the best sub that could be built out of a pair of drivers with the following specs
Fs:38Hz
Vas:50 L
QTS:0.8
Max Power:150W
Currently thinking of a sealed sub using a linkwitz transform aiming for an equalized Q of 0.8 and FS of around 30 t0 25Hz using a 40Litre box
Is there a possibility to use both woofers in a sealed push pull arrangement in combination with a linkwitz transform?
Would it also be possible to have both woofers in an isobaric config still using a sealed box?
Thanks |
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| Brett |
| quote: | Originally posted by zeus_threat
I would like an advice on the best sub that could be built out of a pair of drivers with the following specs
Fs:38Hz
Vas:50 L
QTS:0.8
Max Power:150W
Currently thinking of a sealed sub using a linkwitz transform aiming for an equalized Q of 0.8 and FS of around 30 t0 25Hz using a 40Litre box
Is there a possibility to use both woofers in a sealed push pull arrangement in combination with a linkwitz transform?
Would it also be possible to have both woofers in an isobaric config still using a sealed box?
Thanks |
Q is a bit high for my tastes.
A push-push sealed box can use an LT.
Most isobarics are built with the rear driver in a sealed cab. |
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| chops |
I would (and did) go push-pull. You'll need twice the airspace naturally, but you'll also get twice the output and twice the power handling.
With isobaric, you can use both drivers in the same airspace as a single driver, you get the same output as a single driver, but still gain twice the power handling. |
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| Brett |
| quote: | Originally posted by chops
With isobaric, you can use both drivers in the same airspace as a single driver, you get the same output as a single driver, but still gain twice the power handling. |
Isn't isobarik 1/2 the cab size generally?
With push-push, you'll also get lots less cabinet vibration. |
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| chops |
| quote: | Originally posted by Brett
Isn't isobarik 1/2 the cab size generally?
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Yes, you're correct Brett. Thanks for pointing that out.
Sorry, it's late and I'm extremely tired and should be in bed... Which is exactly where I'm headed off to right now. :sleep: |
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| zeus_threat |
So a push-push config would mean having two drivers in one box with both cone pointing outwards?
Is there any advantage that the push-push might have over the push-pull or vice-versa?
Thanks |
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| bjorno |
| quote: | | I would like an advice on the best sub that could be built out of a pair of drivers with the following specs... |
Difficult to answer when not knowing the driver brand name, x-max and the SPL requirement?
b
1(1) |
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| phase_accurate |
| quote: | | Is there any advantage that the push-push might have over the push-pull or vice-versa? |
The advantage is called "pulse compensation" - meaning less vibration of the box - which you would only achieve with a lot of weight otherwise.
Regards
Charles |
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| zeus_threat |
| Thanks for the posts greatly appreciated. I do not have any info about the Xmax but the target SPL should be around 95dB. Will a bridge 120W per woofer be sufficient ? |
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| Brett |
| quote: | Originally posted by zeus_threat
Thanks for the posts greatly appreciated. I do not have any info about the Xmax but the target SPL should be around 95dB. Will a bridge 120W per woofer be sufficient ? |
How can we possibly answer that without more driver specs. It'd just be a wild guess otherwise. |
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| zeus_threat |
| Which more driver specs will be required? I can check them out |
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| chops |
| quote: | Originally posted by zeus_threat
Which more driver specs will be required? I can check them out |
Brand: *
Qes: *
Qms: *
Qts: *
Fs: *
Vas:
Re:
BL:
Le:
Xmax: *
Pe:
SPL: *
Fill in as many of these as possible, the most important ones with the (*) by them.
Also, another advantage of push-pull designs is the cancellation of even-harmonic distortions from the drivers motor and suspension systems. But in order for this to properly work, you have to have one driver mounted inverted AND wired electrically out of phase which will keep both drivers acoustically in-phase. I feel that reducing even-harmonic distortion is more important than "pulse compensation" which can be mostly taken care of by a well built enclosure. |
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| Rademakers |
SPL is around 87 dB/W/m for a single driver. So 90 dB/W/m for a double (double volume compared to a single) and isobaric mounted 81 dB/W/m (halve the volume compared to a single).
Wkr Johan |
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| zeus_threat |
| Sorry for soooooooooooo long reply. Went on net and did a lot of research around. Decided to go for sealed equalized push pull config. Out of the attached image which push pull config would be recommended ? Or does anyone has any info on any of those arrangements? (Its only figures forget the size of each image) |
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| mashaffer |
Late to the game here but given those specs a Ripole or regular W frame OB might be a nice approach. The nice high Q favors open systems like these (or really large box) and the Ripole could lower that highish fs a bit. Just a thought.
mike |
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| zeus_threat |
| Hi thanks for the reply had a look at ripole design very interesting but still if i used sealed equalized enclosures with push-pull arrangement which one would be more advised from the attahced figure? A, B, C, D OR E ? |
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