is four woofers necessary? how would 1 or 2 woofers stack up?
is this a case of matching efficiency or does the orifice as a low pass filter also attenuate what it passes
is this a case of matching efficiency or does the orifice as a low pass filter also attenuate what it passes
Two woofers I go also use, holes left and right in horn, it is four so you have more efficienty as I did hear.
so the behavior of the hole is like the insertion loss of a electrical filter?
is there a way of predicting how much loss?
is there a way of predicting how much loss?
For the hole it has be as a low pass filter, normally 6 dB for a port injection point I think it is 12 dB total space between cone and port is important, look synergy threats.
Because we use a wideband HF from 500 to 20 Khz we can stay with a two way system making things easyer.
i'm not threatened by synergy i just want to know how they work 😀
what do you mean or are trying to say with the term 12db total space?
what do you mean or are trying to say with the term 12db total space?
Xrk - I'm surprised that little cone works as well as it does up high.
These little Synergy horns are interesting for those of us with large flat panel tvs. With woofers to get down to 100hz or so it would make the perfect compact center channel. I could *maybe* shoehorn 3 8s on mine and get down there.
These little Synergy horns are interesting for those of us with large flat panel tvs. With woofers to get down to 100hz or so it would make the perfect compact center channel. I could *maybe* shoehorn 3 8s on mine and get down there.
Turk - the mid port/chamber forms an acoustic lpf and I haven't seen any attenuation in the passband vs the driver as a direct radiator. Of course, when the driver/mid port configuration is added to a horn correctly and the horn is of sufficient size you get increased eff. Often times the horn isn't large enough to load down low so more drivers can help the lf section to "keep up" with the mid and hf. Lots of factors and different configurations to consider so that's a pretty generic description.
Threatened
I did mean thread just one t differents, ohh yes I did forgot a comma, on total space😀 a compression chamber do work like a low pass filter of 6dB octave. I am still not so good in english, and sometimes to fast
The bass injection ports are low pass devices that allow the bass to be summed with the mid/tweet in a point source. At the larger diameters I am using they don't have any losses at the operating bandwidth and in fact have some gain - like a slot loaded port on an open baffle. You can use two it's really about trying to get max sensitivity and matching Max SPL as you need more Sd to move air. I am using 4 because two 5.25's don't have enough SPL to keep up with the full range at higher SPL. You can get +6dB with four in series parallel at same impedance. You can get +6dB at half the impedance with 2 drivers in parallel. This can all be modeled in the Akabak script.
so scaling from what the danley synergy is targeted to do spl wise finding a small dimension tweeter rather then a compression driver would be less efficient spl wise so would that then not allow the same for mid/low bands?
where would i find more info with respect to "hole" tuning?
where would i find more info with respect to "hole" tuning?
It has not turned out that the small tweeter is less efficient than a CD in a synergy. As you can see I am getting some really high SPL out of the little Tang Band W2-852SH. 109dB at 2.83v is similar to what a CD gets in a synergy. Although I do have 10 to 12 dB less sensitivity at the very high frequencies. Most of the time though, that doesn't matter as the compression driver is heavily padded down to match the circa 100dB sensitivity of the mids/woofers.
There are several long threads in Multiway forum discussing the bandpass injection port and optimizing it. Probably start with "Best midrange for bandpass in Unity" thread.
There are several long threads in Multiway forum discussing the bandpass injection port and optimizing it. Probably start with "Best midrange for bandpass in Unity" thread.
Hi,
Foam as thick than 1.5 cm is not advised : very hard to cut clean, with good enough edge !
People need imho for this project a foam around 5 to 8 mm !
Cutting a clean pattern from the paper print is not as easy it seems as well ! Bad day today...
X, your skill is high !
Foam as thick than 1.5 cm is not advised : very hard to cut clean, with good enough edge !
People need imho for this project a foam around 5 to 8 mm !
Cutting a clean pattern from the paper print is not as easy it seems as well ! Bad day today...
X, your skill is high !
TangBand 852Sh is what I wound up using for my second set of Unity Horns, about six years back : Creating The Perfect Soundstage - Car Audio | DiyMobileAudio.com | Car Stereo Forum
I have a hunch that the "Tang" in "Tang Band" might be Ben Tang from AuraSound. (My first Unity used 2" from Aura Sound.) You'll notice Ben's name on the AuraSound spec sheets : http://www.madisound.com/pdf/aurasound/NS3-193-8-S43.pdf
It's good to see people trying out these tiny drivers. I've learned that if you use a proper high pass, this things work really nicely on a horn or waveguide.
I bought eight of the 2" AuraSound drivers when Parts Express put them on sale for Black Friday, I need to do something with them...
I've tried about a dozen different configurations.
I even 3D printed tangerine phase plugs for the midranges. (A very complex phase plug design that would be semi-impossible to build by hand.)
In the end, I found that a plain ol' frustrum works pretty darn well. The tangerine phase plug smoothed the rolloff a bit, but it didn't extend the highs in any noticeable way. Basically the high frequency rolloff is largely determined by the T/S parameters of the driver, and a complex phase plug won't do much to extend things. You might get another 200hz in high frequency extension. (IE, the phase plug will extend your highs from about 1500hz to 1700hz.)
TLDR : use a frustrum, it works.
If anyone is up for some experimentation, I have a hunch that you'd get really good results with this driver :
AuraSound NS2-326-8AT Whisper 2" Extended Range Speaker Driver 8 Ohm
I've used both the 852Sh and the NS2 and the latter sounded a little bit better to me. Not night and day, but noticeable.
The Peerless 830970 and the SB Acoustics 2.5" driver are attractive for this type of horn too.
The good thing about the TB is that it has a very very low mms, which is good when you're trying to get to 20khz. The bad thing is that it has very very low mms, which can make it get "shouty" about 2000hz.
The SB Acoustics has a couple of extra features which are really handy here. First, it has a cloth dustcap that should behave a bit like a whizzer cone. You can see in the measurements the SB has a rising response. The SB also has a copper cap, which will extend the high frequencies by lowering inductance. The Peerless has this too.
I haven't had a chance to listen to my SBs yet, but on paper they look great. I've built horns and waveguides with all the other ones I listed.
Sorry about the wall of text! I've been using these drivers for half a decade, and it's encouraging to see others put them on horns.
Funny you mention that. I have been itching to ask about that little Aura driver. I was tempted to buy some on black Friday but I thought the sensitivity would be too low to work with and the high freq too limited.. And I really don't know enough about horns yet. I would love to see the Trynergy in a smaller format, so long as it could get down to meet a sub and still keep it's efficiency and output high and price down. I would love to experience the Trynergy in 5.1.
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The compression driver is padded (in the midrange) because people normally build a Synergy with a conical horn, and the hf response of the CD falls at hf so the midrange of the CD needs to be compensated. After CD compensation the mids are louder. You won't see over 100dB out of a 1"exit CD on a conical horn after compensation.
That little Tang Band is about 95db if it was flat?
Ehhh a faseplug do shure extent, in my case 3 Khz on the trynergy who is not enough.
http://www.diyaudio.com/forums/full...-trynergy-full-range-tractrix-synergy-72.html
I am busy now with the radial plug as last resource, finding a speaker with good T/S is difficult, we need a strong motor for HF.
But thanks for the tips!! do you have some more info about that?
Never mind, did find it, and now I do now what you mean.
http://www.diyaudio.com/forums/multi-way/217298-square-pegs-29.html
When I put a bigger dustcap? I mms go up, and max FRQ lowering, but to test that is a idea..
Thanks
regards
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