I''ve taken care of the 4 speakers (4x6's) in dash and (6x9's) in rear deck w/ a decent 4 channel amp, now, on to the subs. I have 2 Sony 10' 150 RMS 650 PEAK single voice coils on each in a sealed box. Right now I have a smaller Sony (280 GTX) running them daisy-chained off the 4 channel.It sounds pretty good but I think I'd like to upgrade a little.I have 8 gauge wire powering that amp now and I'd like to keep from having to run a 4 gauge if I dont have to on a new amp.Any suggestions on a suitable amp. Also should I go class D mono or regular 2 channel Thanx,
Tego
Replies (8)
uochronos on 09/5/2004 15:36:44
what ohmage are these subs? sony has made many 150watt rms subs..
the main differnce between a 1 and 2 channel amp is a bridged 2 channel amp is going to be stable at 4 ohm and a 1 channel amp is either 2 or 1 ohm stable... so you want one to match your subs.
also aa class D or T amp 1 channel is going to be 90+effietiebnt meaning that 90% of the power going in comes out as sound. were a 2 channel A/B amp is 50-75% effietient meaning in mowst only about 70% of the power going in comes out as sound. so it takes mroe power to get the same wattage from it.
also a 1 channel amp well usualy be cheaper then a 2 channel amp bassicaly a 2 channel amp has the parts for 2 amps inside it so it costs more to build.and in turn more to you.
al these are things to look at when buying and amp... well happy shopping.
Chronos
montego_27 on 09/5/2004 18:07:36
The subs are 4 ohm. Does that alter your opinion?
swez on 09/5/2004 18:15:22
Sony only makes 4 ohms subs the last time I looked at the lineup. Here a Class D or T mono amp makes the most sense.
Since you already have a 4 channel amp, want to use a very efficient sub amp that will provide at least 300 RMS to your subs. (150 each)
Alpine, Sony, US Acoustics, JL, JBL, Kicker and HiFonics all have Mono Class D amps.
What is the RMS power of that Sony 280 GTX in 2 channel mode at 4 ohms?
Swez
montego_27 on 09/5/2004 18:34:54
These are the specs on the "little Sony" as I call it. I'd like to stay w/the 8 gauge wire and I like "tight" over "thump"i.e. Tower of Power and other high powered horn bands. 400W max power
80W x 2 into 4 ohm, 20 - 20kHz, @ 0.04% THD
100W x 2 into 2 ohm, 20 - 20 kHz, @ 0.1% THD
200W x 1 into 4 ohm, 20Hz - 20kHz, @ 0.1% THD
Class AB
Variable 50 - 300Hz Low Pass Filter
40Hz EQ Boost
RCA and Speaker Level Inputs
Speaker Impedance -- 2 - 8 ohm stereo, 4 - 8 ohm mono
Frequency Response -- 5 - 50kHz
Input level range -- 0.2 - 6V (RCA), 1.2 - 12V (High level)
Power Supply Voltage range -- 10.5 - 16V
Current drain (at rated output 4 ohm) -- 24 A
Weight -- Approx. 2.8 kg (6 lb 3 oz)
Dimensions -- Approx. 286 x 55 x 196 mm (11-3/8 x 2-1/4 x 7- 3/4") (w/h/d)
swez on 09/5/2004 19:01:49
OK, with a 300 watt RMS class D amp, you will pick up a shade under 3dB in bass power to subs. That's not a huge amount over what you have now... (80 RMS per sub VS 150 RMS per sub) Enough to notice, but not enough to shake the world either.
The Sony sub specs say 650 Peak watts... yeah right! But, you can go over 300 RMS and still be fine. Especially if using a small sealed enclosure for these subs. Do you know the cf airspace of the enclosure used for the subs? If 1.0 cf or a tad less per sub, can probably go to 400-500 watts of amping power here. Just have to be careful in gain setting the amp so you don't blow the subs.
Comments?
Swez
ttocs on 09/7/2004 22:59:12
ttt
ttocs on 09/7/2004 22:59:27
ttt
swez on 09/8/2004 09:32:09
Bump ^
Tego
Replies (8)
uochronos on 09/5/2004 15:36:44
what ohmage are these subs? sony has made many 150watt rms subs..
the main differnce between a 1 and 2 channel amp is a bridged 2 channel amp is going to be stable at 4 ohm and a 1 channel amp is either 2 or 1 ohm stable... so you want one to match your subs.
also aa class D or T amp 1 channel is going to be 90+effietiebnt meaning that 90% of the power going in comes out as sound. were a 2 channel A/B amp is 50-75% effietient meaning in mowst only about 70% of the power going in comes out as sound. so it takes mroe power to get the same wattage from it.
also a 1 channel amp well usualy be cheaper then a 2 channel amp bassicaly a 2 channel amp has the parts for 2 amps inside it so it costs more to build.and in turn more to you.
al these are things to look at when buying and amp... well happy shopping.
Chronos
montego_27 on 09/5/2004 18:07:36
The subs are 4 ohm. Does that alter your opinion?
swez on 09/5/2004 18:15:22
Sony only makes 4 ohms subs the last time I looked at the lineup. Here a Class D or T mono amp makes the most sense.
Since you already have a 4 channel amp, want to use a very efficient sub amp that will provide at least 300 RMS to your subs. (150 each)
Alpine, Sony, US Acoustics, JL, JBL, Kicker and HiFonics all have Mono Class D amps.
What is the RMS power of that Sony 280 GTX in 2 channel mode at 4 ohms?
Swez
montego_27 on 09/5/2004 18:34:54
These are the specs on the "little Sony" as I call it. I'd like to stay w/the 8 gauge wire and I like "tight" over "thump"i.e. Tower of Power and other high powered horn bands. 400W max power
80W x 2 into 4 ohm, 20 - 20kHz, @ 0.04% THD
100W x 2 into 2 ohm, 20 - 20 kHz, @ 0.1% THD
200W x 1 into 4 ohm, 20Hz - 20kHz, @ 0.1% THD
Class AB
Variable 50 - 300Hz Low Pass Filter
40Hz EQ Boost
RCA and Speaker Level Inputs
Speaker Impedance -- 2 - 8 ohm stereo, 4 - 8 ohm mono
Frequency Response -- 5 - 50kHz
Input level range -- 0.2 - 6V (RCA), 1.2 - 12V (High level)
Power Supply Voltage range -- 10.5 - 16V
Current drain (at rated output 4 ohm) -- 24 A
Weight -- Approx. 2.8 kg (6 lb 3 oz)
Dimensions -- Approx. 286 x 55 x 196 mm (11-3/8 x 2-1/4 x 7- 3/4") (w/h/d)
swez on 09/5/2004 19:01:49
OK, with a 300 watt RMS class D amp, you will pick up a shade under 3dB in bass power to subs. That's not a huge amount over what you have now... (80 RMS per sub VS 150 RMS per sub) Enough to notice, but not enough to shake the world either.
The Sony sub specs say 650 Peak watts... yeah right! But, you can go over 300 RMS and still be fine. Especially if using a small sealed enclosure for these subs. Do you know the cf airspace of the enclosure used for the subs? If 1.0 cf or a tad less per sub, can probably go to 400-500 watts of amping power here. Just have to be careful in gain setting the amp so you don't blow the subs.
Comments?
Swez
ttocs on 09/7/2004 22:59:12
ttt
ttocs on 09/7/2004 22:59:27
ttt
swez on 09/8/2004 09:32:09
Bump ^
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