3" fullrange in 2way

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akarma 76

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Joined 2014
#1
Hi. Need 3" fullrange in 2 way, - 500-18000kHz. 12" midwoofer will be supporting it from bottom. It will be open baffle like MJK.

- Tymphany TC9FD18. Cheap, good reviews, flat response, low THD. The only thing that confuse me is relatively low sensitivity.
- Tang Band W3-881SJF. More sensitive, flat response.

Any thoughts and ideas about subject?
 
#2
Define "Full Range", so you plan to use this as a combined Mid/Tweeter?

Where do you plan to crossover?

How does a 12" qualify as a MID-woofer? Seems to me it is just a Woofer?

If you are crossing at 500hz, then you might consider the Dayton Reference RS75 -

Dayton Audio RS75T-8 3" Reference Full-Range Driver Truncated Frame

http://www.parts-express.com/dayton-audio-rs75-4-3-reference-full-range-driver-4-ohm--295-380

Speakers of this size typically do not handle a lot of power and are most often used in PAIRS to boost power handling and output. This is also true of the Tang Band speakers.

Can you explain more thoroughly what you are trying to accomplish? This sounds like a very odd speaker with 1x12" and 1x3". I'm not saying your design doesn't make sense, I'm only saying that since I have no idea what your design is, I have no way of knowing IF it makes sense.

Steve/bluewizard
 
#4
I have tested a large number of full range drivers for use as FAST as you intend. TC9FD is a top performer and should work well. It is very flat but if you want more clarity and lower distortion - the TG9FD10-8 is a top pick at $22. If you want higher performance and have $ then go with ScanSpeak 10F/8424 or Visaton B80. Fountek FR88EX is also good. Dayton PS95-8 should also be considered. Others to try are Peerless P830986 and P830983. Overall best value and SQ is probably TG9FD10-8. But for $10 you can't go wrong for trying a TC9FD. The Faital Pro 3FE22 and 3FE25 are also excellent as tops in a FAST.

http://www.diyaudio.com/forums/full...nd-comparison-3in-5in-full-range-drivers.html

http://www.diyaudio.com/forums/full...ind-comparison-3in-5in-drivers-round-2-a.html

http://www.diyaudio.com/forums/full...ind-comparison-2in-4in-drivers-round-3-a.html

http://www.diyaudio.com/forums/full...ind-comparison-2in-4in-drivers-round-4-a.html

http://www.diyaudio.com/forums/full...d-comparison-2in-3-5in-drivers-round-5-a.html

Regarding sensitivity, most of these drivers are 83dB to 87dB sensitivty at 2.73v. When paired with a typical 88dB woofer after baffle step losses you may still need to pad down the full range to level match. However using pro audio woofers like many 97dB 12in will require the woofer to be padded down. Most of the time having more bass to work with is a good thing though and with OB you need all you can get.

My other suggestion is to use a Harsch XO. 500Hz is perfect to do this at. Use a 4th order Butterworth at 500Hz and 2nd order Bessel on full range. Set delay on full range equal to half the period of one cycle at XO frequency. This will give you a quasi transient perfect reproduction so percussion is realistic. More info here:

http://www.diyaudio.com/forums/multi-way/277691-s-harsch-xo.html
 
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#5
Define "Full Range", so you plan to use this as a combined Mid/Tweeter?
Click to expand...

Yes. Mid/tweeter. Xover point is 350-500Hz with miniDSP.

How does a 12" qualify as a MID-woofer? Seems to me it is just a Woofer?
Click to expand...

This is a Alphard PS12. Pro mid. Looks like this:



Fs - 42Hz, Qt - 0.45, Vas - 129L, mms-49g.

Speakers of this size typically do not handle a lot of power and are most often used in PAIRS to boost power handling and output. This is also true of the Tang Band speakers.
Click to expand...

I understand it. The only my concern is that using it in pairs may cause high frequencies decrease.

Can you explain more thoroughly what you are trying to accomplish?
Click to expand...

Well, i like fullrange speakers but there's a lot of compromises. If fullrange driver is large then it beams and HF are not so good. If it's small then Low Fr. suffer. So 2way is a optimum when 3" FR speaker is responsible for HF and 12" midwoofer is responsible for Low F and midbass.

I've made prototype OB box:



I like how it works and sound but need a FR speaker with relatively good midrange and HF. Low distortion is important too.
 
#11
Lots of good 3" drivers. We have had FF85k (we used it in an MJK OB), FF85wk, Alpair A6.2/A5.2, TC9, Scan 10F, Aura NS3, TBs, and more.

The FF85wk & Alpairs were our favourites. The TC9 were underwhelming (even at the price), the Scan 10F too pricey for the performance they provided.

FF85-W14-1000.jpg


dave

PS: when listening to X's clips you are also listening to his room, his amps, the mic he used to record it (a big information looser) so they are not capable of telling you how much DDR/detail the drivers are capable of. That is the kind of info that makes the difference between a good driver & a great one.
 
#13
Despite what P10 says about the TC9, it is the basis of the BEST measuring (and I can assume sounding) DIY speaker in all of diyAudio - and perhaps 99.5% of all commercial speakers. Look at Wesayso's Two Towers. Is detail provided by some of the recommended drivers that have so called DDR really there in the original recording ? It is that added detail due to generation by drivers with exaggerated detail?

Try throwing 50 A7.3's together and getting the same IR, SR, and phase response and flat from 20Hz to 18kHz response.

Let's not start another Ax.x and FFxxxwk vs Vifa/Peerless/SS debate. I will stop here.
 
#14
x - I think Dave's short list of FR drivers was in the context of the OP's query re a relatively simple 2-way, FAST / MJK OB project

If only for budgetary reasons, the Alpairs or larger FF-WKs would likely be off the shopping lists for most folks considering a 25unit per side line array, which believe it or not - rather like OBs - are not an ideal system for everybody.
 
#17
akarma 76 said:
What do you think about Faital 3Fe22 (4Om or 16Om)? These drivers are available right close by. What if do you compare 3Fe22 with TG9FD10 or TC9FD10?
Click to expand...

Hi prisoner of conscience 😀 !
I played with 25 active in OB in the spring and has done for a fellow (that was impressed by mine) quick and cheap passive 22 in CB with 10" woofers.
We havn't direct comparison but in generally 22 and 25 drivers themself seems similar enough.
If you treat the project more seriously more flat FR seems desirable IMO.
 
#20
Don't forget xmax as that is related to how much distortion you will get when played at SPL's requiring more cone movement. I think Tang Band has very small xmax of 0.5mm and both PS95 and TC/TG9 are about the same at 2.5mm (5x more xmax where cone travel stays in relatively linear portion of magnetic field), and between those, the TC/TG9 have lower distortion (approaching -50dB at typical listening levels). Although I would dispute that the W3-883SJ has a flatter response than the 3FE25. Look at the performance up to 10kHz where most of the "flat" response is perceived by our ears. The peak at 12k is not an issue and going slightly off axis cures that.

http://www.parts-express.com/pedocs/specs/294-1104-faitalpro-3fe25-8-specifications.pdf
 
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