Dayton DA-115 4 samples

Mzisserson

Vas by delta mass, beat on for 24 hours with 15Hz tone exceeding X-max

MFG

• Impedance8 ohms
• Frequency Response60 to 15,000 Hz
• Sensitivity84.9 dB 2.83V/1m
• Resonant Frequency (Fs)60 Hz
• DC Resistance (Re)6.4 ohms
• Voice Coil Inductance (Le)0.7 mH
• Mechanical Q (Qms)2.6
• Electromagnetic Q (Qes)0.49
• Total Q (Qts)0.41
• Compliance Equivalent Volume (Vas)0.155 ft.³
• Mechanical Compliance of Suspension (Cms)1.1 mm/N
• BL Product (BL)5.7 Tm
• Diaphragm Mass Inc. Airload (Mms)6.6g
• Maximum Linear Excursion (Xmax)2.5 mm
• Surface Area of Cone (Sd)53.1 cm²

Sample 1

Re         =      6.6853 ohms

Fs         =     69.5598 Hz

Zmax       =     49.3078 ohms

Qes        =      0.5527

Qms        =      3.5238

Qts        =      0.4778

Le         =      0.4404 mH  (at 1 kHz)

Diam       =     82.5500 mm  (  3.2500 in  )

Sd         =   5352.0971 mm^2(  8.2958 in^2)

Vas        =      2.9773 L   (  0.1051 ft^3)

BL         =      6.1502 N/A

Mms        =      7.1550 g

Cms        =    731.6698 uM/N

Kms        =   1366.7367 N/M

Rms        =      0.8874 R mechanical

Efficiency =      0.1704 % 

Sensitivity=     84.3316 dB @1W/1m

Sensitivity=     85.1113 dB @2.83Vrms/1m

Sample 2

Re         =      6.8547 ohms

Fs         =     68.8860 Hz

Zmax       =     48.8000 ohms

Qes        =      0.5899

Qms        =      3.6099

Qts        =      0.5071

Le         =      0.4450 mH  (at 1 kHz)

Diam       =     82.5500 mm  (  3.2500 in  )

Sd         =   5352.0971 mm^2(  8.2958 in^2)

Vas        =      3.3623 L   (  0.1187 ft^3)

BL         =      5.7000 N/A

Mms        =      6.4603 g

Cms        =    826.2757 uM/N

Kms        =   1210.2498 N/M

Rms        =      0.7746 R mechanical

Efficiency =      0.1751 % 

Sensitivity=     84.4498 dB @1W/1m

Sensitivity=     85.1208 dB @2.83Vrms/1m

Sample 3

Re         =      6.9739 ohms

Fs         =     67.7901 Hz

Zmax       =     48.2939 ohms

Qes        =      0.6004

Qms        =      3.5574

Qts        =      0.5137

Le         =      0.4499 mH  (at 1 kHz)

Diam       =     82.5500 mm  (  3.2500 in  )

Sd         =   5352.0971 mm^2(  8.2958 in^2)

Vas        =      3.0208 L   (  0.1067 ft^3)

BL         =      6.0609 N/A

Mms        =      7.4251 g

Cms        =    742.3423 uM/N

Kms        =   1347.0874 N/M

Rms        =      0.8890 R mechanical

Efficiency =      0.1473 % 

Sensitivity=     83.6992 dB @1W/1m

Sensitivity=     84.2953 dB @2.83Vrms/1m

Sample 4

Re         =      6.7091 ohms

Fs         =     69.9648 Hz

Zmax       =     48.0408 ohms

Qes        =      0.5315

Qms        =      3.2741

Qts        =      0.4572

Le         =      0.4225 mH  (at 1 kHz)

Diam       =     82.5500 mm  (  3.2500 in  )

Sd         =   5352.0971 mm^2(  8.2958 in^2)

Vas        =      3.2377 L   (  0.1143 ft^3)

BL         =      6.0077 N/A

Mms        =      6.5037 g

Cms        =    795.6452 uM/N

Kms        =   1256.8416 N/M

Rms        =      0.8732 R mechanical

Efficiency =      0.1960 % 

Sensitivity=     84.9415 dB @1W/1m

Sensitivity=     85.7058 dB @2.83Vrms/1m

kennyk

A little variation  from PE specs. Did you test them cold, out of the box?

jr@mac

He beat 'em up, from what I read.

kennyk

I meant, did you also measure them out of the box. 

Mzisserson

Beat them for 24 Hours at 15Hz.. I turned the level up until they started to audibly strain then backed down a hair until they stopped and left it there. They have a surprising amount of excursion limit. I took all four samples and re-ran all of my sims and the variation from using the datasheets was less than 0.5dB. I got worried for s second, but in the end I think wherever it was off (like Fs) the Vas came in lower overall making up for it so the cab requirements stayed the same. One note, once backed down out of the "oh shit" range, they were extremely quiet mechanically which was surprising. Usually inexpensive drivers, even metal ones, can be a bit "whumphy" when pushed hard, but not brake em' hard. 

I am having an issue overlaying on my OOOOOOOL' WT2 so I cannot post the plots at the moment, but the Z curve is very smooth with zero blips. If the FR performs as expected these will be crossed around 1K and will be moving an 8" PR. Seems they will do Just fine.