Boston Acoustics SPG555-2

This sub can be found for $350. I bought mine with the 1 f^3 factory sealed enclosure, then cut an oval out of the back (opposite the driver) and installed the passive radiator (free +3db with dummy cone) tuned to 30hz (with supplied weights). I am powering it with an MTX 81000-D, birth sheet says 1308 watts rms into my subs 2ohm load. I have read the SPG can take 1800 watts rms. I don't doubt this, as I am shopping for a bigger amp now. I have the gain set for 51 volts at my max volume, which shows no clipping on my oscilloscope and equals 1300 watts on my 2 ohm Boston. Have not melted the coil at max volume yet. Max temp of the plastic on the outer ring of the outside of the voice coil (its perimeter) I have measured with a laser no contact thermometer is 212 F. It did not fail at that temp. I did melt the coil once with the same amp, but gain was set too high on a road trip (6hrs of Tech 9 and Mike Jones) and it was clipping the signal. I did not have and oscilloscope or volt meter (51v rms ='s 1300w) to set the gain on the road. The replacement surround and voice coil just keeps getting louder, and runs cooler. It has been about 2 months of listening at full volume Bass Mekaniks and still the spider is getting looser and the sub getting louder, and now runs at about 98F after HARD hitting tracks. I also blew the surround out once when my girl opened my truck at full volume, thus unloading the driver and allowing over excursion (stretching the foam surround excessively). Evidence it is getting louder: volume 24 was max voltage for the amp and listenable. Now, volume 18 hurts my ears. My left ear is ringing and popping during the day, and my girl friend says both her ears are waxing more and damaged. Also, the whole car is shaking now, window, seats, dash, sodas in the console. Also, DVD navigation disc in the trunk just skipped and wouldn't operate for the first time the other day. This sub was made to conquer the 13W7 (and I read it did), Boston is way underrated, and audiophile grade. That is why I bought this, is does not distort a note, and shakes my whole car, all for 1 cubic foot! The only other sub that could come close for 1 cubic foot per sub would be Premier SPL sub. Recommended 1.5 f^3 per 12". So, 2 x 12= 3 Premier SPL. Also, equals 3 SPG + 3 passive radiators, total, 3 cubic ft. Although, the RE XXX does recommend max of 1.1 cubic ft sealed for their 12", and JBL MKII 12" recommends 1 cubic ft for sealed 12. Can somebody produce a louder sub in 1 cubic ft that Boston with the SPG 555 teamed with the passive radiator (which increases output by 3db but doesn't affect box volume)?

This sub hits low and hard. If you don't have much room get this; it is a very high quality product.

After learining about passive radiator setups, I sold my two 12" Type-R's and decided to replace them with this one sub, backed with its counterpart, the SPG-TR. I built the box to specs recommended in the owner's manual, and I couldn't be happier with it. I have yet to hear the 30 hz or the 45 hz setup, but the 35 hz setting has pleased me thus far. The low end really booms, while maintaing a smooth transfer into the higher notes. Its really amazing how low the little 1 cubic foot box can hit. If your looking for truly flat response, you might look elsewhere; it really spikes around the tuning frequency of the passive radiator. For anyone looking to save some space and still have a strong low end with great sound quality, it cant be beat. I got my trunk back and can tell little difference in volume level. Running it off a Rockford T1000BDCP which puts out around 1200 watts at 1.6 ohms (which this sub is). Very pleased with my decision.

So i bought this from Sonic and the first sub I received looked like it had been used or an open box. I called Sonic and worked it out and they sent me out a new one. Seems to be much better condition (new). I have owned many many subs from JL Audio, Rockford Fosgate and so on. I had a Rockford T1 12 that sounded very good but i wanted just a little bit more boom. I read many reviews on this sub and decided to go with it. I got lucky and bought the Ported/Vented Subwoofer Enclosure from a buddy of mine for a very good price.



This sub really makes some good BASS. I have to say WOW

I am using a Rockford T1500-1bd amp with plenty of power. Musically the sub performs very well and when you want to make this sub hit it has no problem doing it. I am considering buying a second one from Sonic. If you are reading this i would say go for it.

Ok so here is what I had, JL 10w7 and a 500/1v2 now I have a spg555-2 and a Rockford fosgate t15000-1bdcp. And it smokes the jl in every way. Sq and spl are not even close, the Boston wins hands down. I have my sub in the SQ box that Boston gives specs on in the owners manual. Its tight, fast and stupid deep bass. I can say I was on the fence when I sold my W7 and now I laugh. Half the price and twice the output. This sub is like 92db you don't need any power at all to run it. I love it will never give it up.