Sensitivity is not a standalone parameter, but has t be seen with some other parameter like excursion.
This driver has a low excursion factor at high SPL, when Ch is typical of PA systems where the throw has to cover a wide area.
matching tweeter/compression driver suggestion for a 12" driver with 97dB sensitivity
- Thread starter Naveenbnc
- Start date
This driver has a low excursion factor at high SPL, when Ch is typical of PA systems where the throw has to cover a wide area.
danielnaveen2003
Active Member
VAS can be calculated using Cms and Sd. Cms can be derived using Mms and FS. No?
Yes, can be derived with these parameters, but usually all companies provide VAS value.
*Hi Naveen,
coming straight to the point : let Ahuja handle till 3-5kHz, after that only a compression driver or a planar pro audio tweeter can match its efficiency(~100dB). PRV D280TI-B can also be a good option, if HF100 is not available. B&C DE250 is amazing but a lil costly. and of course you would need a good horn with dispersion specs.
Regards,
Aniket
coming straight to the point : let Ahuja handle till 3-5kHz, after that only a compression driver or a planar pro audio tweeter can match its efficiency(~100dB). PRV D280TI-B can also be a good option, if HF100 is not available. B&C DE250 is amazing but a lil costly. and of course you would need a good horn with dispersion specs.
Regards,
Aniket
Hey Aniket, ...very nice to see you on the thread
. Rarely we are seeing you on the forum.
greenhorn
Well-Known Member
If you use this driver for lows then it will severely lack bass due to low xmax.
Instead, I suggest opposite route, use it as a fullranger where it handles 800hz and above. Use a pro grade woofer for the lows.
Both the drivers will have sufficient overlap in frequency range and that lends itself to a simple 1st order xover doing away with xover complexity for the time being. If you have a sound card and active amps then xover is much easier to experiment on PC.
Now, the fullranger will lack the highs, as expected (and can be seen from the frequency response of the driver), so just bring it up by EQ. Above ~15khz wont be needed anyway, practically speaking.
Instead, I suggest opposite route, use it as a fullranger where it handles 800hz and above. Use a pro grade woofer for the lows.
Both the drivers will have sufficient overlap in frequency range and that lends itself to a simple 1st order xover doing away with xover complexity for the time being. If you have a sound card and active amps then xover is much easier to experiment on PC.
Now, the fullranger will lack the highs, as expected (and can be seen from the frequency response of the driver), so just bring it up by EQ. Above ~15khz wont be needed anyway, practically speaking.
I have used SK-12FR X (8 ohm) in 36X12X13 bass reflex cabinet.
Had spent some 100 hrs. with the drivers and here is my observations,
Source - Raspberry PI 3 + Allo Boss DAC (format - Flac)
Amp - Norge 1000 Gold
- With Tone control off, Vocals - great; Highs - good and Lows - okay. Highs are marginally bright but listening at off-axis helps.
- By increasing Bass to little, I see a great sound coming from the speakers. Enjoyable and no fatigue.
- In this setup, I see there is no need for a helper tweeter or subwoofer. Of course, I listen 80,90s Tamil songs (Illayaraja and A R Rahman) so I don't expect a deep bass but what this speakers delivers is good on both highs and lows. I do listen modern day Tamil songs as well.
This receiver is my work horse so wanted to try how the speaker reacts to this receiver.
- With Tone control off & Subwoofer - Nil, Vocals - great; Highs - okay and Lows - bad.
- With Subwoofer set at 80 Hz, Overall presentation has improved a lot. My Sub, MJ Acoustics Reference is a sealed sub so it integrates well with front L and R. But the soul that was present in Norge is missing in AV receiver.
- This is a great drivers considering its price and availability. For 11k-12k, you will get a fully built speakers which can suit your medium to large living rooms.
- Pair it with dedicated Stereo amps to sense its full potential. With AV receivers, as @Kannan sir suggests, Sub is a mandatory.
- As @Ravindra Desai suggested in another thread, we may need to try with tube amps or his own design amp to see how this 12" adds value.
Ravindra Desai
Well-Known Member
I have used SK-12FR X (8 ohm) in 36X12X13 bass reflex cabinet.
Had spent some 100 hrs. with the drivers and here is my observations,
Source - Raspberry PI 3 + Allo Boss DAC (format - Flac)
Amp - Norge 1000 Gold
Amplification - Marantz SR 3001 5.1 AV Receiver
- With Tone control off, Vocals - great; Highs - good and Lows - okay. Highs are marginally bright but listening at off-axis helps.
- By increasing Bass to little, I see a great sound coming from the speakers. Enjoyable and no fatigue.
- In this setup, I see there is no need for a helper tweeter or subwoofer. Of course, I listen 80,90s Tamil songs (Illayaraja and A R Rahman) so I don't expect a deep bass but what this speakers delivers is good on both highs and lows. I do listen modern day Tamil songs as well.
This receiver is my work horse so wanted to try how the speaker reacts to this receiver.
So,
- With Tone control off & Subwoofer - Nil, Vocals - great; Highs - okay and Lows - bad.
- With Subwoofer set at 80 Hz, Overall presentation has improved a lot. My Sub, MJ Acoustics Reference is a sealed sub so it integrates well with front L and R. But the soul that was present in Norge is missing in AV receiver.
- This is a great drivers considering its price and availability. For 11k-12k, you will get a fully built speakers which can suit your medium to large living rooms.
- Pair it with dedicated Stereo amps to sense its full potential. With AV receivers, as @Kannan sir suggests, Sub is a mandatory.
- As @Ravindra Desai suggested in another thread, we may need to try with tube amps or his own design amp to see how this 12" adds value.
Congratulations for completing this build and thanks for sharing your experience with all of us.
Since you have gone through the trouble of making these beasts, I will have to find a way, with you, to enable you to try my electronics. I assure you that it will make a huge difference.
I will have my enclosures ready by Sunday. I will post the pictures then.
Thanks again, V!
Regards,
Ravindra.
Ravindra Desai
Well-Known Member
Guys (and girls?),
Since this is again a thread that uses Ahuja Full range speakers, I feel you should read the entire thread below especially post # 8 and 16.
https://www.hifivision.com/threads/...nse-and-imaging-of-full-range-speakers.69961/
I feel this is important since I have used big words to describe my experience with this driver and the build. At the same time I feel that you should know what you are getting into as I value your time and efforts.
Do let me know if you have any doubts.
Regards,
Ravindra.
Since this is again a thread that uses Ahuja Full range speakers, I feel you should read the entire thread below especially post # 8 and 16.
https://www.hifivision.com/threads/...nse-and-imaging-of-full-range-speakers.69961/
I feel this is important since I have used big words to describe my experience with this driver and the build. At the same time I feel that you should know what you are getting into as I value your time and efforts.
Do let me know if you have any doubts.
Regards,
Ravindra.
He is using a ported enclosure, though I had tuned the port to another 12 inch driver.
I am yet to hear it, maybe one of these days.
Ravindra Desai
Well-Known Member
Attached is an alternate plan. Same as before but with a different depth. Either one should work the same.
All dimensions are inner.
Front and back faces are placed inside the box frame.
Length of the port is from the front face.
Use 18mm MDF.
Do not skip the bracing!
Regards,
Ravindra.
P.S. Best used with amplifiers with low damping factor!
All dimensions are inner.
Front and back faces are placed inside the box frame.
Length of the port is from the front face.
Use 18mm MDF.
Do not skip the bracing!
Regards,
Ravindra.
P.S. Best used with amplifiers with low damping factor!
Attachments
Is this build for Ahuja Dfx200? I have got the 12" of SK frx 12, I'm planning for OB currently, this build mentioned seems like worth trying if OB doesn't suit my expectations.
Out of the two the one on FR thread and this one which is better? The other one is quite wide for my listening room.
My professional DJ Box maker suggested this build instead..
Thanks for sharing greenhorn !!!
This drawing is of scoop used for Bass in PA systems. These are mostly used for 15 and 18 inch drivers never seen for a 12 inch driver.
Finally put in the first OB build using Ahuja SK Frx12..
Initial impressions - totally crap, nothing other than midrange is acceptable, bass is absent totally..
Now after 20hrs - they've started singing. Especially paired with just 3wpc tube amp its giving unbelievable SQ in the treated HT room. I kept playing overnight yesterday for burn in & when played in the evening - I'm simply surprised with the improvements. The sound is very open and airy, the bass is much improved without being boomy, but it still lacks the punch. Old hindi songs, jazz, hindustani classical and blues sound like a live performance. Bass /Punch Lacks in fast numbers and metal genre where lot is going on. Subtle details are improving, seems it'll sound lot better after 100hrs. But the sweet openness with a tubes is amazing, appears like I wasn't listening to actual reproduction all these years. (Same feeling I had, when I ate Chinese at Hong Kong after eating Chinese all these years in India )
Placement is tricky, a few mm changes alter the music drastically, keeping the LR balance has never been so difficult. They're quite Mammoth for my room anyway.
So far Very good!
Thanks everyone for the inputs on OBs.
Initial impressions - totally crap, nothing other than midrange is acceptable, bass is absent totally..
Now after 20hrs - they've started singing. Especially paired with just 3wpc tube amp its giving unbelievable SQ in the treated HT room. I kept playing overnight yesterday for burn in & when played in the evening - I'm simply surprised with the improvements. The sound is very open and airy, the bass is much improved without being boomy, but it still lacks the punch. Old hindi songs, jazz, hindustani classical and blues sound like a live performance. Bass /Punch Lacks in fast numbers and metal genre where lot is going on. Subtle details are improving, seems it'll sound lot better after 100hrs. But the sweet openness with a tubes is amazing, appears like I wasn't listening to actual reproduction all these years. (Same feeling I had, when I ate Chinese at Hong Kong after eating Chinese all these years in India )
Placement is tricky, a few mm changes alter the music drastically, keeping the LR balance has never been so difficult. They're quite Mammoth for my room anyway.
So far Very good!
Thanks everyone for the inputs on OBs.
Baffle dimensions
Very much right, that's what I was looking for the next upgrade ; I've left a place for another 12" driver below for same purpose...
No I haven't, I read about it, but couldn't understand its importance.
Yes the openness and faithful reproduction of recording is very captivating. They're nowhere comparable to my MA Silver RX6 in resolution etc but they have their strengths where it matters.
2ft (W) x 3 ft (H).
Maximum possible from MDF lying with me after some carpenter work at home. Front baffle is double Layer of 18mm MDF angled at 5 degrees upwards
Hopefully @Naveenbnc I'm not hijacking the purpose of your thread. Due apologies in advance.
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