Things like the Pensil could be made into the same kind of shape if one has the building chops. Horns are a bit trickier. For instance on a Frugel-Horn one would be to add an edge/teradrop shaped supraBaffle around the top of the horn.
ie: bury the top in one of these:
Would take resome finese to make it look decent..
dave
ie: bury the top in one of these:
Would take resome finese to make it look decent..
dave
This “compromise” dictates a maximum size miniOnken. The alignment is such that a smaller version is doable but for this driver, no one has asked.
dave
Pierrick59,
Dave's Mini-Onkens are bass-reflex cabinets with his special port tuning; if you make a BR cabinet too tall, then it starts becoming a TL or a MLTL. If you increase the volume (keep the height same, but increase width and depth), that will affect the frequency curve also, and there are optimum alignments you can aim for by changing the volume and the tuning.
The Pensil is a custom MLTL type alignment that Scott Lindgren uses. You can make the Pensil look more similar to Dave's Mini-Onken cabinets and get some of the benefits of lesser diffraction. The other parameters like cabinet internal height, driver distance from the port, cross-section area, port size etc. have to be maintained - only the front baffle will look different.
Dave's Mini-Onkens are bass-reflex cabinets with his special port tuning; if you make a BR cabinet too tall, then it starts becoming a TL or a MLTL. If you increase the volume (keep the height same, but increase width and depth), that will affect the frequency curve also, and there are optimum alignments you can aim for by changing the volume and the tuning.
The Pensil is a custom MLTL type alignment that Scott Lindgren uses. You can make the Pensil look more similar to Dave's Mini-Onken cabinets and get some of the benefits of lesser diffraction. The other parameters like cabinet internal height, driver distance from the port, cross-section area, port size etc. have to be maintained - only the front baffle will look different.
One of the rules i follow that i feel is important to the quality of the bass is;
The derivative of the simulated FR does not cross zero more than once.
When a box becomes too big it does not adhere to this rule.
dave
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this rules can be applied to a pensil or a fhxl? or just the minionken follow this rule?
With the FHXL the room plays a role, but pretty much yes.
Here is the sim from the Pensil10.3 (,y mark-up of the anechoic extension)
In any quarter-wave the ripple higher up can be ignored as far as this ruke applies. One of th eadditional degrees of freedom of a quarter-wave/TL design.
dave
Here is the sim from the Pensil10.3 (,y mark-up of the anechoic extension)
In any quarter-wave the ripple higher up can be ignored as far as this ruke applies. One of th eadditional degrees of freedom of a quarter-wave/TL design.
dave
Pierrick59,
Dave posted that picture as example of a Pensil that is built differently vs the standard design - but the difference is the curved sides and boat hull shaped cabinet.
You can work on some changes to the front baffle as long as the other parameters are maintained.
Dave posted that picture as example of a Pensil that is built differently vs the standard design - but the difference is the curved sides and boat hull shaped cabinet.
You can work on some changes to the front baffle as long as the other parameters are maintained.