Agreed-
https://www.diyaudio.com/community/...ifi-woofer-speaker-builds.352063/post-7180502
B&W did this with the Nautilus almost a quarter of a century ago. A true museum piece IMHO.
Good luck with your ventures!
https://www.diyaudio.com/community/...ifi-woofer-speaker-builds.352063/post-7180502
B&W did this with the Nautilus almost a quarter of a century ago. A true museum piece IMHO.
Good luck with your ventures!
WOW! I am properly impressed! Those aluminum housings look awesome! Did you cast them and then mill and polish? Or are they hogged out of a great big block of metal? Either way, they are awesome! Foam cored composite tends to be extremely dead in the sense that it won't transmit sound from inside through the walls of the cabinet, so that should work really nice.
I'm curious what your ideas are about the interior of the foam cored composite enclosure. Is it better to put a lot of laminate on the outside and leave the inside bare foam to absorb sound which might otherwise reflect around inside the box? Or should the box structure be made stiffer and lighter by laminating both inside and outside, in which case the hard interior is prone to reflecting sound. And if you laminate the inside of the box, what reflection and resonance mitigating techniques are you planning to use?
What is the preferred method of mitigating reflections/resonances inside the cabinets of high-end speakers? A dense material like MDF or layers of that with foam sandwiched between? Do they get lined with foam rubber, filled with styrofoam peanuts, I guess I'm hoping people throw out suggestions. I'm really impressed with a lot of builds on here and want to know what members thoughts are about creative ways to improve performance through materials and shapes. Would a very jagged interior molded from very soft foam be ideal or is there something that would be better?
I'm curious what your ideas are about the interior of the foam cored composite enclosure. Is it better to put a lot of laminate on the outside and leave the inside bare foam to absorb sound which might otherwise reflect around inside the box? Or should the box structure be made stiffer and lighter by laminating both inside and outside, in which case the hard interior is prone to reflecting sound. And if you laminate the inside of the box, what reflection and resonance mitigating techniques are you planning to use?
What is the preferred method of mitigating reflections/resonances inside the cabinets of high-end speakers? A dense material like MDF or layers of that with foam sandwiched between? Do they get lined with foam rubber, filled with styrofoam peanuts, I guess I'm hoping people throw out suggestions. I'm really impressed with a lot of builds on here and want to know what members thoughts are about creative ways to improve performance through materials and shapes. Would a very jagged interior molded from very soft foam be ideal or is there something that would be better?
Super nice construction. You mention that the production speaker will have a different woofer cabinet... Is this project a custom build for a single customer, or are you actually going into production to sell retail?
I would like more information about the design and the design process please. Very interesting. Are your DSP filters FIR or IIR? You say it is a 4-way system, so are the two lower 8's crossed to the upper 8, then crossed to the 3" dome, then 1" dome? If you have any driver measurements (polar responses, distortion, etc), that would be very interesting to share.
I would like more information about the design and the design process please. Very interesting. Are your DSP filters FIR or IIR? You say it is a 4-way system, so are the two lower 8's crossed to the upper 8, then crossed to the 3" dome, then 1" dome? If you have any driver measurements (polar responses, distortion, etc), that would be very interesting to share.
You project is fantastic !
But about the newt project wit diamond mid, the mid will be from accuton, right ? because bliesma do not have made the mid in diamond version, except if you know something that the rest of the world don ot know.
Also, about the dsp that you will plan use with ESS 9039 pro DAC inside. Do you have any infos to share, i am really interested about this. (you can write to me in private, if you want).
Thank you.
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Will be interesting in the results, as the poron is an vibration isolating material, not so much and vibration energy absorption material you would typically used in constrained layer damping.
Has anyone used the Purifi 8" in a compression driver set up? So many DIY horn speakers are crazy huge, but this driver perhaps offers a path that may be more reasonable in terms of size. I admire the Troels Gravesen The Loudspeaker series using the 18 Sound 1095 compression drivers and XT1086 horn, have folks considered pairing the PTT8 using these proven compression drivers? The mock that was shown earlier in the thread at the Purifi factory looks very interesting that used the Mudorf AMT tweeter with a custom waveguide.
Will this waveguide become available for purchase?
What exactly do you mean by that? I am concerned that the on-axis response may have a noticeable lift in some frequency ranges. Or am I missing something? Maybe this loudspeaker has been designed to be listened to entirely off-axis, while radiating non-flat sound energy levels into the room when measured on-axis?
Are the "imaging" qualities referred to here simply a major result of the "hot" on-axis response relative to the flat 30°-off-axis response? Maybe some additional clarification as to the listening room might be helpful.
I'm gonna do a lil 'in before' so I can say I made a Textreme PTT. It's a structural dome rather than the standard dust cap of the PTT; the mild curve allows for concave or convex placement without being difficult to implement. Currently, I don't plan to do further work with this (build it out, test it, etc.) because at a certain point it gets more entertaining to do your own thing rather than work within an existing geometric set. In other words, I'd rather be working with my own designs, motors, VC, cones, etc.
Brilliant work @Haze Head . But please don't give @lrisbo any new ideas. The PTT drivers are plenty expensive already...
@lrisbo Dear speaker master,
One thing always puzzles me. Regarding 8ohm and 4ohm version of the same driver, it seems that in general 8ohm is slightly better in midrange, and 4ohm is slightly better in low frequency for the same SPL. Why is that?
I guess because 8ohm driver has higher resistance/inductance ratio(resistance doubled, but inductance is normally not, but that's not always true), hence slightly more linear in the midrange. But why 8ohm drivers more often than not measures slightly worse in LF?
Thanks in advance.
One thing always puzzles me. Regarding 8ohm and 4ohm version of the same driver, it seems that in general 8ohm is slightly better in midrange, and 4ohm is slightly better in low frequency for the same SPL. Why is that?
I guess because 8ohm driver has higher resistance/inductance ratio(resistance doubled, but inductance is normally not, but that's not always true), hence slightly more linear in the midrange. But why 8ohm drivers more often than not measures slightly worse in LF?
Thanks in advance.
It's Friday and the world needs some good news. Any news, rumours, speculation on the 10 inchers?
Enjoy your weekend everybody!
Enjoy your weekend everybody!
10” and tweeter progressing. hope to show prototypes at the Munich Show
hi,
In theory, any impedance can we made with exact same T/S parameters and winding height. However, this requires that the wire has a certain profile, eg rectangular with a certain aspect ratio and cross sectional area. Such winding tech exits but is rare.
with circular wire, it is hard to get the exact same T/S and height. the 8 ohms coil will be a bit lighter with slightly lower beta (Bl^2/Re). The 4 ohms version will be able to be tuned to a little bit lower F3 than for the 8 ohms version. The lower mass of the 8 ohms coil will tune the breakups of the cone slightly higher.
These small difference might be audible in some cases
I remember you talked about servo effects in low frequency with a strong motor, is it the 4ohm version exhibit slightly stronger servo control effects in LF and thus "corrects" kms(x) better?
