Peerless XXLS12

Peerlees XXLS12

Peerless Part no: 830847 - Cost $336.36 AUD (20th April 2008)

Double Voice Coils 8ohm + 8ohm in parallel

Znom Nominal Impedance	4 ohm
Pmax Power Handling	350 watts
SPL Sensitivity	86.9 dB/watt@1m
Re Voice coil resistance	2.5 ohm
Fs Resonant frequency	21.8 hz
Qms Mechanical Q	10.24
Qes Electrical Q	0.37
Qts Total Q	0.36
Vas Equivalent volume	144.2 litre
Xmax Maximum excursion	12.5 mm
Sd Cone Area	466 sq cm
EBP Efficiency Bandwidth Product	57 Sealed / All rounder

Here is my parameter file for this driver for WinISD Pro ver 0.50a7

Suggested designs

My Design	70litre box	tuning freq 26hz	Two 102mm ports 947mm long
My Design	54 litre sealed

Here is my Ported design project file for WinISD

Here is my Sealed design project file for WinISD

SPL

Ported with 350W amp incl boost

No bad as you would expect of a 12 inch driver with 350w applied. Excursion limits prevented an EBS tune which would have been flatter and yielded more @ 25hz

Since the EBP value suggests a sealed design, I have modelled it in red. Excursion limits dictate using the 240W amp incl boost

Cone excursion

Below 20hz, excursion becomes excessive as shown in blue. This requires a 14hz high-pass filter to tame as shown in green.

Sealed design shown in red

Port air velocity

Two 4 inch ports are needed to get velocity to around 10 m/sec. Pipe resonance is around 180hz.

Port flares would be required - see the note at the bottom of this page

Most people would probably go for the sealed design which doesn't require the filter. The ported design gives more, but requires a larger amp, a high pass filter and the need to use long ports. Peerless designs use passive radiators to overcome the port problem.

Port Flares - calculated with Flare-it

I would recommend a 13mm routed flare.

The intake could be flange mounted with a 13mm routed flare or you could fit a donut ring .

Depending on the flaring options, you'll need to adjust the physical length so that the effective length is as shown above. The port flares page has a section on calculating effective length as well as some information on availability of commercial flares.

Last update to this page 20th April 2008

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