Hello everyone,
I'm looking for a low end low power solution using two 12” old school Eminence, 8 ohm, paper cone.
More specific, I would be very satisfied with -3dB @40Hz in the 90dB range, let’s say max 2x2x3ft and smaller (60x90cm)... I'd like it as clean of distortions and 'boxy echoes' as possible. So nothing loud or extra low... Mainly for classical and jazz.
Listening room is about L21ft x W17ft x H8-11ft, with an opening of the rear wall of W11ft x L18ft x H8ft.
I have the options to EQ, active crossover (120Hz), passive crossover, about 80W x 2 into 8 Ohms or 250W 4ohm mono available... I have zero experience with enclosure design softwares, I have knowledge of sound propagation, basic electronic components, I do not own expensive speaker wires.. ;}
Please feel free to post sugestions: OB, H frames, variations of horns, TL, push-pull configurations, anyhting that's not going to be extra large is welcomed and apreciated. One or two separate enclosures. I will read all posts.
*************************************************************************************
My fav approach so far would be a “Linkwitz Lab Phoenix Dipole subwoofer” in combo with the current fronts (2-way) or with some new 2-way mid+high OBs of modest wattage.
In the last few weeks I’ve been going to sleep on a OB (20x24”) with the 12” speakers. No filters just a 3” small driver as a A+B config on my bedroom receiver and I looooove the sound. It reproduces the bass cab and upright bass sound more naturally than my daytime 2.1 system given the low volume..
My old school bass amp/cab uses the 10” smaller brothers Eminence paper cones; that probably explains my pleasure in listening to these 12” paper cones. Anyhow, thanks for your interest, help and time, lets have some fun.
*************************************************************************************
Eminence MCM 55-745, 12”, 8ohm specs as shared by mr. Lucas, Design Engineer, Eminence Speaker LLC:
"-pro audio mid-bass woofer, 2" voice coil and a 30 oz ceramic magnet
*a conservative thermal power rating based on the voice coil diameter would be about 150 watts
-T/S parameters:
05-RE OHMS 6.70
06-LE MH 2.25
07-QM 4.74
08-QE .420
09-QT .380
10-XMAX MM 2.80
11-BL TM 13.46
12-EFF % 1.19
13-FS HZ 30.20
14-MMS GMS 59.26
15-CMS mm/N .4687
16-RMS NS/M 2.3723
17-VAS LTRS 186.55
18-SD SCM 532.36
19-EBP 72.7
20-SPL dB 92.8"
Have a great weekend,
Cera
I'm looking for a low end low power solution using two 12” old school Eminence, 8 ohm, paper cone.
More specific, I would be very satisfied with -3dB @40Hz in the 90dB range, let’s say max 2x2x3ft and smaller (60x90cm)... I'd like it as clean of distortions and 'boxy echoes' as possible. So nothing loud or extra low... Mainly for classical and jazz.
Listening room is about L21ft x W17ft x H8-11ft, with an opening of the rear wall of W11ft x L18ft x H8ft.
I have the options to EQ, active crossover (120Hz), passive crossover, about 80W x 2 into 8 Ohms or 250W 4ohm mono available... I have zero experience with enclosure design softwares, I have knowledge of sound propagation, basic electronic components, I do not own expensive speaker wires.. ;}
Please feel free to post sugestions: OB, H frames, variations of horns, TL, push-pull configurations, anyhting that's not going to be extra large is welcomed and apreciated. One or two separate enclosures. I will read all posts.
*************************************************************************************
My fav approach so far would be a “Linkwitz Lab Phoenix Dipole subwoofer” in combo with the current fronts (2-way) or with some new 2-way mid+high OBs of modest wattage.
In the last few weeks I’ve been going to sleep on a OB (20x24”) with the 12” speakers. No filters just a 3” small driver as a A+B config on my bedroom receiver and I looooove the sound. It reproduces the bass cab and upright bass sound more naturally than my daytime 2.1 system given the low volume..
My old school bass amp/cab uses the 10” smaller brothers Eminence paper cones; that probably explains my pleasure in listening to these 12” paper cones. Anyhow, thanks for your interest, help and time, lets have some fun.
*************************************************************************************
Eminence MCM 55-745, 12”, 8ohm specs as shared by mr. Lucas, Design Engineer, Eminence Speaker LLC:
"-pro audio mid-bass woofer, 2" voice coil and a 30 oz ceramic magnet
*a conservative thermal power rating based on the voice coil diameter would be about 150 watts
-T/S parameters:
05-RE OHMS 6.70
06-LE MH 2.25
07-QM 4.74
08-QE .420
09-QT .380
10-XMAX MM 2.80
11-BL TM 13.46
12-EFF % 1.19
13-FS HZ 30.20
14-MMS GMS 59.26
15-CMS mm/N .4687
16-RMS NS/M 2.3723
17-VAS LTRS 186.55
18-SD SCM 532.36
19-EBP 72.7
20-SPL dB 92.8"
Have a great weekend,
Cera
Xmax 2.8 is not a good fit for OB/H/U type baffles, unless you are looking for low spl playback. I am biased toward TL designs which can incorporate asymmetrical bracing and enough damping to mitigate a lot of the trouble with boxes.
Hi All,
Agree with phivates,
The New T/S is better than what I estimated but must be taken with a Grain of Salt.
If only using the fs,Qts and Vas to Calculate a Sealed or Ported Box Calc. would be OK when using a Rookie Program.But if incorporating all underlying Parameters results in inconsistency.
Note: My earlier Design still holds.
b🙂
Agree with phivates,
The New T/S is better than what I estimated but must be taken with a Grain of Salt.
If only using the fs,Qts and Vas to Calculate a Sealed or Ported Box Calc. would be OK when using a Rookie Program.But if incorporating all underlying Parameters results in inconsistency.
Note: My earlier Design still holds.
b🙂
Attachments
@ phivates
I see, so the specs of the driver(xmax in particular) indicate that certain approaches wouldn't be wise...
Is 90dB SPL @40Hz considered loud (difficult to produce) in a 350sq ft(30sq meters) room for an OB type/ripole sub configuration?
@bjorno:
I have installed the software (hornresp) you're using and I will get familiar with it. So w/o help, it doesn't tell me much, except a 6cu ft enclosure and that the graph you posted looks very flat in the low region. Between you and me :}, I don't really hear 20Hz or anything higher than 15KHz..
http://www.diyaudio.com/forums/members/bjorno.html
I see, so the specs of the driver(xmax in particular) indicate that certain approaches wouldn't be wise...
Is 90dB SPL @40Hz considered loud (difficult to produce) in a 350sq ft(30sq meters) room for an OB type/ripole sub configuration?
@bjorno:
I have installed the software (hornresp) you're using and I will get familiar with it. So w/o help, it doesn't tell me much, except a 6cu ft enclosure and that the graph you posted looks very flat in the low region. Between you and me :}, I don't really hear 20Hz or anything higher than 15KHz..
http://www.diyaudio.com/forums/members/bjorno.html
One of the OB etc boosters needs to chime in here. I'm an old guy whose opinions are based on what was doable 50 years ago. The first OB speaker I ever heard of was the Carver beast, which had 6 or 8 (I don't know) big woofers defying everything the books and magazines I was learning from had to say about propagating low frequencies. If one has excursion and amplifier capacity to burn then yeah, screw the box. I don't get it.
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