Stereo & Electronics - Quality low cost amp?
10-25-2005, 04:23 PM
I'm thinking of upgrading my bass. Currently have a MTX 2150x amp for my subs in a millhouse box. I blew both my JL audio 10w0's last week and now thinking of just going all new. The 2150x is about 500 watts in 4ohm mono and hits hard, but looking at something that can give me a little more power. I don't want to spend a bunch of $, but want something good. Been looking at soundstream amps on ebay and they look good spec wise, but I have no idea if they are overated or not and any other brand worth looking at would help too.
The ones I've looked at are below.
Xstream Series XTA880.2 (new, not refurb)
@ 4 OHM: 2 X 220 WATTS
@ 2 OHM: 2 X 440 WATTS
CONTINUOUS BRIDGED POWER OUTPUT: 880 WATTS
around $199 shipped
SOUNDSTREAM PCA2.760 PICASSO 2 CH
380w x 2 @ 2 ohms
760w x 1 @ 4 ohms
about $210 shipped
10-25-2005, 05:14 PM
Google shows squat about the MTX 2150X amp...
But if you were really pushing 500 watts rms into those two 10"s... that should be plenty of power imho.
If you want it to hit harder then you could probably make out better matching the right subs up in the right box.
Remember what a 3 db increase in sensitivity can do for you... 500 watts isn't really that much different than 800 in those terms.
10-25-2005, 05:35 PM
Yes. the power from the MTX 2150x into the JL audio 10's was plenty for them. But, I am getting new subs and was thinking about another amp to go along with them. the specs on the 2150x below are from the archive section at MTX. The amps were very underated and came from the factory with a test sheet. Mine said 450watts rms at 12.5v at 4ohm bridged. When I had one of my subs go bad the shop put in a 4 ohm by mistake, so for a couple years I was running 1 8 and 1 4ohm JLaudio 10w0 which if I am correct would be around 2.66ohms, so I should have been hitting at least 500 watts.
18dB/octave, continuously variable crossover with reverse outputs. For example, when you have the crossover set to low-pass, you have a high-pass output. This makes it much easier to connect multi-amplifer systems.
Symmetrical power-supply distributes the heat evenly across the amplifier. This makes it more reliable (meaning, it plays louder).
External Bass Control (EBC) port lets you adjust the bass from your seat with the optional EBC unit.
Individual Gain Controls to center up the soundstage.
Giant MOSFETS (we're not exaggerating - they're huge). A larger MOSFET means power supply stability, and a more reliable product.
8 Volt RMS Input - This large signal capability allows for better integration with high voltage output source units, increased dynamic range, and better Signal-to-Noise ratio in the audio system.
Continuously Adjustable Thunder EQ bass boost, centered at 40Hz. To severely boost the low-end, and the attention you get from other drivers and innocent bystanders.
Unique Split Shield bottom plate design, reduces electromagnetic interference, to improve signal-to-noise ratio and reduce distortion. This design is so hot, we patented it so others can't leech off our genius. (Patent # 5,521,792)
ISO-FEET TM nylon mounting feet, eliminate the possibility of chassis-to-chassis ground noise. Leeches beware, this one's patented too. (Patent # 5,521,792).
RMS Power measured at 12.5 Volts DC:
75 Watts x 2 into a 4 Ohm load with less than 0.05% THD+N
150 Watts x 2 into a 2 Ohm load with less than 0.1% THD+N
300 Watts bridged into a 4 Ohm load with less than 0.1% THD+N
Dynamic Power (IHF-202 Std) measured at 14.4 Volts DC
120 Watts x 2 into a 4 Ohm load
212 Watts x 2 into a 2 Ohm load
425 Watts bridged into a 4 Ohm load
Signal to Noise Ratio:
> or = 110dB A-Weighted
Variable Bass Boost (0-18dB) centered at 40Hz
Variable 50Hz to 200Hz, 18dB/Octave, High Pass or Low Pass Configurable
10-27-2005, 02:28 PM
What subs will you be getting to replace the w0's? What ohm load will the amp have hooked to it?
10-27-2005, 09:55 PM
When looking for low-cost car audio, you will always find crap. low cost=low quality.
If you don't have that much $$, I suggest looking on Ebay for a used mid/high-end amp (Rockford Fosgate, PPI, Orion, Phoenix Gold, etc.) That is in good cosmetic condition. See this: http://cgi.ebay.com/Rockford-Fosgate-Punch-Amplifier-800a2-800-watt-amp_W0QQitemZ5823269892QQcategoryZ39737QQrdZ1QQcmd ZViewItem
All my RF amps were purchased this way, and I haven't had any problems with them at all. Stay the hell away from the flea-market brands (Boss, Rockwood, Legacy, Pyramid, etc.)