Also, not really thinking of a clone. Not looking forward to maintaining downward firing woofers. More thinking of the ideal woofer placement (high or low) and also any good 10" driver recommendations for the sub 200 Hz application that won't cost more than all the other drivers I already have. 😀
Interesting approach. Planet10 might find this interesting especially with experience accessing the pole piece for phase plugs. It might even be done in a not so large enclosure due to the alignment.
Ive sort of been following…at a guess (from the 104ii), diy connect the pole piece s of 2 woofer together?
dave
dave
I didn't understand what really was your point. Yes you said forward, not upward. Okay.
Can you explain more about the advantages vs the good Kef 104/2 layout ?
@planet10 : can be made with the screwholes of the basket imho, same way when done horizontaly in some designs we saw here.
Gentlemen, i.m.o. the KEF 104-II discussion has absolutely nothing to do with the Snell bass configuration. The KEF has a dual woofer bandpass bass module. Shall we stay on topic?
Why ? It is a mass loaded translission line finishing with a port. Just it doesn't fire towards the floor and use 2x8" to mimic a 10". If space is lacking it is totally on topic.
Plus as It is active, load volume or vented volume of the driver(s) chosen can be helped by DSP. The Kef was just a brilliant illustration of a layout to save space and have decoupled mid, not the center of the talk, just an illustratio in the discussion. My point was more : a 10" 40L LROY Seas driver thanks to the plate amps +DSP will be super okay.
Btw, can folded horn can be on the list of mass loaded bass cabinet too ?
Plus as It is active, load volume or vented volume of the driver(s) chosen can be helped by DSP. The Kef was just a brilliant illustration of a layout to save space and have decoupled mid, not the center of the talk, just an illustratio in the discussion. My point was more : a 10" 40L LROY Seas driver thanks to the plate amps +DSP will be super okay.
Btw, can folded horn can be on the list of mass loaded bass cabinet too ?
No it is a double BP. That is a 4th order bandpass system, quite unlike a closed box downfiring woofer.
Boden, Erik had talked of a stiff filter and layout aera, hence the bandpass idea I talked about. It is indeed two sealed woffer firering push pull into a band pass standalone load firering front. So mass loaded somewhat.
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Perhaps start by deciding whether the good parts of the bass are done on the inside or the outside of the cabinet, ie: what are they.
I heard floor coupling mentioned. It's a broad and ill-defined concept as commonly used. Maybe these days we could describe it in terms of modal behaviour, power and usable bandwidth..?
I heard floor coupling mentioned. It's a broad and ill-defined concept as commonly used. Maybe these days we could describe it in terms of modal behaviour, power and usable bandwidth..?
I see the "floor coupling" question in two ways. One is about the distance of a driver to the floor. As most of us know, ground plane measurements are an effective way of doing anechoic grade measurements for a driver. Minimize the distance of both driver and microphone to a solid surface with no walls and the "true" or isolated driver performance comes out.
The other question I have, and one that was met with negative comments when I asked in relationship to a Monitor Audio concept speaker, was whether a woofer pointed at a solid surface would act like a compression driver. So I guess in my mind when I think of the Snell A/III designs I wonder how much was due to the near zero distance to the floor and how much was some sort of compression-driver like loading??
Or how much was just that the woofer, pointing down and open on 4 sides, was forcibly omni directional?
The first part of this is relatively easy to do for me. Just get cabinets and cut holes near the ground. How much of the rest of the benefits am I going to miss?
The other question I have, and one that was met with negative comments when I asked in relationship to a Monitor Audio concept speaker, was whether a woofer pointed at a solid surface would act like a compression driver. So I guess in my mind when I think of the Snell A/III designs I wonder how much was due to the near zero distance to the floor and how much was some sort of compression-driver like loading??
Or how much was just that the woofer, pointing down and open on 4 sides, was forcibly omni directional?
The first part of this is relatively easy to do for me. Just get cabinets and cut holes near the ground. How much of the rest of the benefits am I going to miss?
In Proac designs when firering down the mouth port is just at spikes distances from the floor, some others have apertures just above the base. But were not inside loaded (those are simple BR ports)
I dunno if that maters it fire next to the soil. The good sounding bass from the Kef 107 reference was fireing towards the ceilling like some good omni too !
I think the plate amp and fine filter tunning is enough if you choose a driver that is a little heavy cone as you are active, also a SB29 if SB34 is too big migth be enough maybe.
I dunno if that maters it fire next to the soil. The good sounding bass from the Kef 107 reference was fireing towards the ceilling like some good omni too !
I think the plate amp and fine filter tunning is enough if you choose a driver that is a little heavy cone as you are active, also a SB29 if SB34 is too big migth be enough maybe.