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if you wire the 4 ohm sub voice coils in parallel you will have a 2 ohm load for the Image Dynamics sub, the JL sub only being single voice coil will of course be 3 ohm. You cannot connect them both to the amp you specified as when connected the total load will be less than 2ohms and the amp will either trip it's protection circuit or could damage the amp, My suggestion is to try each sub separately and decide on the one you like the most or obtain a matching pair for the 4ohm DVC.
You, sir, are a rare adherent to stereo-only electronics. Are you replacing it for cause (showing its age)? The PM7003 is only 2 x 70 watts like the JVC but it also has separable preamp/amps so you COULD upgrade or augment the power output with external amps and still control it all locally.
Of course, any current AVR's do that too and bring digital sources and multichannel audio to the mix for as little as the PM7703 may cost.
If your amp can drive a 2 ohm load then you need to configure your speakers for such a load
1 DVC 12 inch sub with 4 ohm coils wired in parallel would give you two ohm.
series impedance you add the impedance together parallel it is this formula (Z1^-1+Z2^-1)^-1 the negative 1 exponent is just the inverse so Z1^-1 is just 1/Z1 Figure out your combination for your speaker setup.
check to make sure your box is securely sealed and that the box itself is not rattling. if not, most subs require a break in period where they can not be played full gain/full volume for the first 48 or so hours... did you break in your subs by paying it softly the first day and slowly turning your amps gain and receivers volume up the next couple of days. if not, it is likely blown
Your Image Dynamics speakers are pretty high quality stuff. When sold new, they probably had a manufacturers suggested retail in the $250 range. But they were usually sold with crossovers and possibly tweeters and most online retailers discounted them heavily.
Try contacting Image Dynamics at one of the listed email addresses or phone numbers and request a users manual.
no connection are good + to + -to - thats all that matters. either the speakers are blown or you need a stronger amp. since you already tried speakers probably need bigger amp. definitley not the box. no such thing as a break in period, are the subs 10 12 inch or what. you could try to bridge them too that means hook both up to the same +-terminals, 2 wires per screw. it usually isnt the way they hook them up, its the wires fuses etc that cause problems. what guage wires is the speaker wire, the power line etc. if you give me these guages i might be able to get somewere
comp VR 15s are rated @ 500W RMS 1000Peak.
The lanzar vibe amplifier is 2 x 600W RMS at 4 OHMS 2 x 1200W MAX at 4 OHMS 1 x 2400W MAX at 4 OHMS Bridged 2 x 1000W at 2 OHMS RMS.
Your subs are single 4 ohm subs.
If your subs are wired stereo, they both are seeing 600W. (more than the rated RMS)
Chances are, you have them wired parallel to a 2 ohm mono load - of which that amplifier is not rated. In theory, it will produce about 2000W @ 2 ohm mono for a short period of time.
Your amplifier is too powerful for your subs. Turn down the gain setting to 3/4 or purchase better subs. Also be sur the subs are inthe proper enclosure. It sounds as if they are excurting past their linear x-max and colliding with the rear bump plate. This will cause damage down the road if left as is.
wire size depends on source, not load capability. your amp can provide 500 watts, so gage should be about 8, provided your speakers are 2 ohms each... you can measure them with ohmmeter. If you have 4 or 8 ohm speakers, you should get impedance matching transformers. Also, you should use a supply capacitor on power feed to amp of about 10 Farads...these are large and not cheap, but they provide "backup" power for heavy bass loads.
I take it that you are running it off a factory head unit and your not getting enough drive on the new speakers. Are the new speakers a component splits? Does it come with a separate tweeters and crossover? If so... are the new speakers 4 Ohm Impedance? Coz the only thing i could think of is that these new speakers you have must have a higher impedance than that of the previous drivers. the higher the impedance the less sensitive. Your can try to match speakers impedance usually head unit is at 4 Ohm. Please let me know how you went. Cheers