12" Full Range Driver

[Dylanthecat]

Hi All,

Found this FR 12" driver on the nevernet the other day.

Be interested in any comments on the Freq Curves and Specs.

I have ordered two pairs in via air freight. These units are $22USD each direct from works. I will let you know what they sound like if interested. BR Martin

GENERAL SPECIFICATIONS
Nominal diameter 305(12) mm (in.)
Nominal impedance 8 Ω
Minimum impedance 5.8 Ω
Program power (1) 300 W
AES Power rating(2) 150 W
Sensitivity (3) 97.5 dB
Frequency range 74 ~ 16000 Hz
Voice coil diameter 50(2) mm (in.)
Chassis material Steel
Magnet material Ferrite
Magnet dimensions (ODxIDxh) 156 x 80 x 20 mm
Coil material CCAW
Former material Glass Fiber
Xmax(4) 3 mm
Xmech(5) 7 mm
Gap height 8 mm
Voice coil Wingding height 10 mm

SMALL SIGNAL PARAMETERS
DC resistance(Re) 5 Ω
Resonance frequency(Fs) 74 Hz
Moving mass(Mms) 32 g
Compliance(Cms) 0.14 mm/N
Force factor(BL) 11 N/A
Mechanical Q-factor(Qms) 6.5
Electrical Q-factor(Qes) 0.77
Total Q-factor(Qts) 0.69
Equivalent air volume(Vas) 62 I
Voice coil Inductance(Le) 0.70 mH
Diaphragm area(Sd) 533 cm2
Reference efficiency(Eta O) 3.2 %

[walpurgis]

Are you planning to use a subwoofer with these?

[Dylanthecat]

Yes Geoff, a BK. Martin

[walpurgis]

Ah. :)

I've been looking at larger full range drivers myself. Some interesting stuff about.

[Ali Tait]

Geoff, have a look at the Fane 12-250c if you haven’t already. There is also a 15” version.

I’ve also been very impressed recently with a Monacor 10” coax unit, the SP310 CX, used in an OB with a couple of their 15” PA drivers.

[walpurgis]

OK Ali. :)

[fatmarley]

$22? Is that a typo?

Frequency response looks a bit too good to be true. In a real baffle I'd expect It to look rather different (download 'The Edge' to see what It would most likely look like In your chosen baffle size).

Saying that, got to be worth a try for the money.

[Dylanthecat]

NO. $22USD!

[walpurgis]

NO. $22USD!

That's certainly damn cheap Martin.

I've had my eye on these from China: https://nl.aliexpress.com/item/Aucharm-speakers-rhyme-10-inches-full-frequency-loudspeaker-paper-cone-side-phase-aluminum-frame-aluminum-physical/32734357597.html

Specs look good, useable output down to 30Hz or below by the look of it. Cloth surrounds too.

[Stratmangler]

Hi All,

Found this FR 12" driver on the nevernet the other day.

Be interested in any comments on the Freq Curves and Specs.

I have ordered two pairs in via air freight. These units are $22USD each direct from works. I will let you know what they sound like if interested. BR Martin

GENERAL SPECIFICATIONS
Nominal diameter 305(12) mm (in.)
Nominal impedance 8 Ω
Minimum impedance 5.8 Ω
Program power (1) 300 W
AES Power rating(2) 150 W
Sensitivity (3) 97.5 dB
Frequency range 74 ~ 16000 Hz
Voice coil diameter 50(2) mm (in.)
Chassis material Steel
Magnet material Ferrite
Magnet dimensions (ODxIDxh) 156 x 80 x 20 mm
Coil material CCAW
Former material Glass Fiber
Xmax(4) 3 mm
Xmech(5) 7 mm
Gap height 8 mm
Voice coil Wingding height 10 mm

SMALL SIGNAL PARAMETERS
DC resistance(Re) 5 Ω
Resonance frequency(Fs) 74 Hz
Moving mass(Mms) 32 g
Compliance(Cms) 0.14 mm/N
Force factor(BL) 11 N/A
Mechanical Q-factor(Qms) 6.5
Electrical Q-factor(Qes) 0.77
Total Q-factor(Qts) 0.69
Equivalent air volume(Vas) 62 I
Voice coil Inductance(Le) 0.70 mH
Diaphragm area(Sd) 533 cm2
Reference efficiency(Eta O) 3.2 %

I'd be a bit wary about the coil material - it's copper coated aluminium wire, and aluminium wire isn't exactly known for its tensile properties.
I certainly dislike CCA network cable, and refuse to touch it. It fails to achieve the Cat5e standard.

[walpurgis]

KEF, JBL and others use aluminium wound voice coils without bother though.

[Stratmangler]

KEF, JBL and others use aluminium wound voice coils without bother though.

Once wound the coil itself doesn't shift.
The leadouts flex and move, and it's them I'd be bothered about.
My thoughts are prejudiced by the shit network CCA stuff.

[Sherwood]

Look at the site again and the price quoted!

[Dylanthecat]

Hi my price is based on quotations that I have. I have been in direct correspondance with them all thru' the week. They seem very easy to deal with. All questions have been answered. Martin