This new stand is a big, heavy and stiff steel structure that is well braced but transfers the energy from the moving cone mass like the tip of a pool cue through the walls and braces and here is a demo of this
Each leg ends in a bolt plate, and with just one of these plate ends pushed up slightly against a leg of the Heaving Bed activates the bed's jiggle system nicely. This is just the moving mass of this lil sub activating the PU rubber railed slats by transmitting through one stand leg into one bed leg. Both legs are seriously braced to the rest of the structures and to the floor with their heft
After a few hours of playing music the Racer sub has developed a nice tone and sitting on the Heaving Bed it delvers a nice kick up the butt. All in free air and mounted super sturdy. This driver seems like it was engineered to work with PRs. I have arguments for using thick foam walled cabs and after getting the broken in T/S, how about a 30mm XPS walled cab for this?
Each leg ends in a bolt plate, and with just one of these plate ends pushed up slightly against a leg of the Heaving Bed activates the bed's jiggle system nicely. This is just the moving mass of this lil sub activating the PU rubber railed slats by transmitting through one stand leg into one bed leg. Both legs are seriously braced to the rest of the structures and to the floor with their heft
After a few hours of playing music the Racer sub has developed a nice tone and sitting on the Heaving Bed it delvers a nice kick up the butt. All in free air and mounted super sturdy. This driver seems like it was engineered to work with PRs. I have arguments for using thick foam walled cabs and after getting the broken in T/S, how about a 30mm XPS walled cab for this?
Each of the stock Datsv3 cables measures 0.4R on the multimeter
The multimeter cables when shorted, measures 0.2R on the multimeter
Datsv3 swapped out with the multimeter cables, the multimeter leads measure 0.985R on Datsv3. The high resistance appears around 15-20khz in all tests
You can just play a low frequency tone and generate near xmax travel on low power to break in the driver qwikly. Music will take forever and probably lacks the necessary cone movement/time invested per parsec @ the reciprocal of light speed converted to Jules /nana electron volt
Tried the manually pushing to xlimits as recommended previously. It does measure differently after this action but a rerun soon after reverts to unbroken in readings. It is interesting to hear the character change while breaking in with music with a short playlist in repeat. The basslines in the Bass Shelter playlist easily push it to limits in free air. I have the volume set to just before it bottoms out
If anyone is after a very small driver that can deliver a nice, hard kick inna boxless design, this one does it
Datsv3 shows 2.5R Re for the driver. Needs a high current amp and the discrete Class H in the z623 delivers without getting upset with the volume and boost set high to compensate for the low boxless SPL
Has anyone following this ever listen to a JBL BB3?
How does it have a nice ‘kick’ when both sides are open in free air to cancel out the majority of the sound?
Merry Christmas to all, have you kissed your gyal under the camel toe yet?
The tone is very nice now and Robbie Shakespeare's familiar basslines coming through clean and sweet and I can really catch some of the subtleties quite nicely. Looking forward to built sound.
I don't know, explain to me why. All I can come with is that maybe we are seeing the torque the driver motor has in action. Look how much energy is transferring to the Heaving Bed with only a tiny point of contact along one edge of the strap on the leg to the bed leg. The stand is on a concrete floor. Something is summing? With the volume turned up, there is good presence to the kick. In free air it also delivers more bass than all the big ticket book shelfers down York Street, Sydney that I auditioned
The tone is very nice now and Robbie Shakespeare's familiar basslines coming through clean and sweet and I can really catch some of the subtleties quite nicely. Looking forward to built sound.
@Booger weldz
Hey man, Link me a YT track that you would use to scrutineer electronic kicks. Let's get some more free air recordings with tracks you are familiar with before taking it off the breaker amp and running it through Datsv3. I don't think it will open up any further
It has turned out to be a bit of synth kick champion in free air and just placing a flat open hand just lifts the output. I don't mind the sound of this bass at all. I'll take some more recordings later tonight when things are quieter
Let's place a backless type of design in the queue for this driver. How bad would a low flat 2.1 soundbar be with all three drivers in backless? Or would it be better in separate cabs?
Hey man, Link me a YT track that you would use to scrutineer electronic kicks. Let's get some more free air recordings with tracks you are familiar with before taking it off the breaker amp and running it through Datsv3. I don't think it will open up any further
It has turned out to be a bit of synth kick champion in free air and just placing a flat open hand just lifts the output. I don't mind the sound of this bass at all. I'll take some more recordings later tonight when things are quieter
Let's place a backless type of design in the queue for this driver. How bad would a low flat 2.1 soundbar be with all three drivers in backless? Or would it be better in separate cabs?
Booger, I thought you were interested in different flavours of bass. This one sounds very good, but difficult to describe. It is clean and authoritative in near field listening with the stand 1m out from the wall
I think it’s fun to explore 1/4 wave verses Helmholtz resonators because they seem to sound uniquely different. Also, TH or paraflex (and maybe backloaded horns where the ‘3/4’ resonace is artificially inflated seem to have a distinct ‘punch’ because of the 80-120hz frequencies?
I dunno how/if a subwoofer speaker in free air(with no baffle to seperate the waves) is suppose to relate to anything?
(I’m dumb) I dunno what ‘clean and authoritative ’ means if it’s allowing both sides of the driver to interact with no baffle or resonator , etc)
I dunno how/if a subwoofer speaker in free air(with no baffle to seperate the waves) is suppose to relate to anything?
(I’m dumb) I dunno what ‘clean and authoritative ’ means if it’s allowing both sides of the driver to interact with no baffle or resonator , etc)
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Don’t the harmonics of the instruments used in ‘island’ music (kinda includes reggae?) tend to favor the ‘cubo’ boxes which have a peak at the 3 x 1:4 wave area?
I used to listen to a lot of slightly stupid or sublime , etc before I got addicted to 27-32 hz🙈
I used to listen to a lot of slightly stupid or sublime , etc before I got addicted to 27-32 hz🙈
I am hearing another unique sound and very different from what I am used to. There isnt any particular punch or peaky sound but rather very open. Really hard to describe. There is zero colouration that I can hear. This makes the detail in the upper bass super clean. Crossing at 300hz. The back of the driver is 1m away from a full wall of heavy drapes
Eq'ed to where I have it, you can see it's well-behaved when driven hard and there is plenty of clean bass for near field listening even with that wave sep thing that you are on about. I won't say no to this bass even if I don't know what is happening there
Anyone know much about open back bass?
Taken the racer off the amp and returned the z623 driver to its cab. I miss the open sound to the bass. The much higher SPL weight of the boxed output is immediately apparent, but so is the lack of the boxless sound. I need to look more into this sound
I feel the racer is broken in and ready for it's Dats runs and Vas calculations
I feel the racer is broken in and ready for it's Dats runs and Vas calculations
The "figure of 8" dipole polar response from an open baffle reduces room reflections around the perimeter of the cone, while the rear output is 180 degrees out of phase from the front output, so the sound reflected from the wall behind the speaker is in the opposite polarity of a box speaker (monopole/omni) in the same position.
Since the room modes dominate the low frequency response of the woofer, the dipole radiation pattern results in a different sound, the dipole tending to reduce the excitation of room modes, which may sound "boxy" to you.
Outdoors (no walls) if EQed to the same response, the dipole and monopole won't sound much different, other than the reduced output capability of the dipole, which can be reached using less power than the monopole requires.
Art, I am not familiar with dipole and open baffle speakers. Are they are the same thing? I really enjoyed the sound. The signature itself sounds like an enhanced super clean BR in that I can imagine each subtle roll of the flatwounds developing to how far I send it and stop it. May be only in my imagination or maybe I can really hear the absence of some form of veil. I don't have the words to describe this other than that I like it
I am interested to hear your take on this dipole bass sound in the context of home environment and not PA use. I am really kicking myself for not running it through its paces much earlier, when they were $35 cheaper because...
Would have been affordable to run multiple drivers per side in slim baffle only floor towers in an active two-way with the FR drivers from the donar z623. I feel four drivers per side would come close to the output of the z623 sub box
An open baffle speaker has a dipole radiation pattern, it's polar response consisting of two primary lobes, with similar, but opposite polarity radiation forwards and backwards, and little output perpendicular to the axis.
A radiation pattern is not the same thing as a speaker, it results from the speaker.
Linkwitz (R.I.P.) describes the radiation patterns of monopoles vs. dipoles and differences of how they are perceived in a room:
https://www.linkwitzlab.com/frontiers_4.htm
@weltersys @Randy Bassinga
I think He starts messing with this(dipole /figure 8 shape) in the sound ? @ 7:00 ?
I think He starts messing with this(dipole /figure 8 shape) in the sound ? @ 7:00 ?
Yes, two monopole speakers with one polarity reversed result in a dipole (figure of 8) radiation pattern, the cancellation depicted by the cords around the speakers:
Delaying the forward polarity reversed monopole by the spacing interval distance results in a cardioid (heart shaped) radiation pattern:
Delaying the forward polarity reversed monopole by the spacing interval distance results in a cardioid (heart shaped) radiation pattern: