Hi,
Have short listed these two sub for my hatch back,Right now i am using ID10"V3D2,Sub will get power@250W RMS
HERTZ ES380
HERTZ by Elettromedia - Special Car Stereo
D mm 32
Xmax mm 9
Re ohm 2.9
Fs Hz 24.2
Le mH@1khz 2.63
Le mH@10khz 1.14
Vas lit 183.00
Mms gr 240.4
Cms mm/N 0.18
BL T-m 13.28
Qts 0.52
Qes 0.60
Qms 3.93
Spl (1m/2,83V) DB 95

Size mm 380(15")
Power
Handling
(Watt) peak/conti 900/450
Impedance ohms 4
Frequency
response hz 20-200
Sensitivity db/spl 95

Xmech* mm 14.5

*Xmech maximum mechanical excursion: it indicates the range of movement in zone of linear operation of the loudspeaker, in both senses

IDQ 12"D2V2
Image Dynamics - Tech Pages
Nominal Impedance (IMP) 1 / 4 ohm
DC Resistance (Re) .975 / 3.9 ohms
Resonant Frequency (Fs) 19Hz
Electrical "Q" (Qes) .271
Mechanical "Q" (Qms) 4.59
Total "Q" (Qts) .256
Equivalent Volume (Vas) 5.04 ft3
One Way Linear (Xmax) 13.5 mm
Cone Area (Sd) 530 cm2
Sensitivity (Spl) 90.2 db
RMS Power Handling (Pwr) 100 to 500
Speaker Displacement .07 ft3

SUB will be decided out of two only,Plz advice how should i go about it,if needed plz ask for something that i have missed.Cheers!

 

IDQ hands down the best sounding sq woofer for the money, IMO...

 

Those are both great subs. I'd probably go for Hertz. IDs are great also, but not as exotic imo.

 

It would be realy great if current owner or user of sub can post reviews for the subs,as it makes easier for others to take a call.

 

Looks like you are comparing 15" Hertz to 12" IDQ. Is that your intention? Not really fair, cause the specs are really different.

It appears Hertz might be happier in sealed enclosure only. Hertz has a tiny xmax = not much low extention output. BL on it is tiny too. The only good thing about it may be that it's sensitive, but so is IDQ.

I would take IDQ, but it would still be a bad choice if in the future you decided to get a bigger amp for it, as it doesn't like too much power. The design is amazing for sound quality, but is kinda old technology, and if you push it hard, it will not be happy. So it seems, you are going strictly for SQ. If that's the case, IDQ is hard to beat.