guys do i need Pre-Amp?

[thm]

i have Definitive Tech Mythos Four speakers
and pioneer elite VSX-92TXH

Here is info about mythos
Frequency Response :35 Hz – 30 kHz
Impedance :Compatible with 8 Ohms outputs
Sensitivity :91 dB
Recommended Associated Amplifier Power :20 - 225 watts
A/V Receiver Crossover Setting :100 Hz

and receiver
Info about pioneer

Surround Power 130 Watts x 7 (20Hz - 20 kHz, 8 ohms, .09% THD)
Stereo Power 130 Watts x 2 (20Hz - 20 kHz, 8 ohms, .09% THD)

thanks for any input

 

[jostenmeat]

The receiver already has the pre-amp, so no.

Pre/pro = preamplifier + processor.

Receiver = preamplifier + processor + amplifier.

 

[thm]

The receiver already has the pre-amp, so no.

Pre/pro = preamplifier + processor.

Receiver = preamplifier + processor + amplifier.

so what should i do or get to use full potential of speakers ?

 

[markw]

so what should i do or get to use full potential of speakers ?

Don't they play loud enough for you?

just because a car can go 140 mph doesn't mean it has to be driven at that speed for best performance. In fact, it most likely performs better at a lower speed.

 

[jostenmeat]

so what should i do or get to use full potential of speakers ?

Start reading. A lot.

Start experimenting. A lot.

IMO, speaker placement cannot possibly be overemphasized. Even small things like moving the speaker away from the front wall by just two feet can make for a world of change. You will see.

 

[walter duque]

i have Definitive Tech Mythos Four speakers
and pioneer elite VSX-92TXH

Here is info about mythos
Frequency Response :35 Hz – 30 kHz
Impedance :Compatible with 8 Ohms outputs
Sensitivity :91 dB
Recommended Associated Amplifier Power :20 - 225 watts
A/V Receiver Crossover Setting :100 Hz

and receiver
Info about pioneer

Surround Power 130 Watts x 7 (20Hz - 20 kHz, 8 ohms, .09% THD)
Stereo Power 130 Watts x 2 (20Hz - 20 kHz, 8 ohms, .09% THD)

thanks for any input

What you need is power amps. 130 Watts is not much power. To get your money out of your speakers I would use 350 watt amps. Receiver 130 watts-is weak.

 

[markw]

dunno about that.

What you need is power amps. 130 Watts is not much power. To get your money out of your speakers I would use 350 watt amps. Receiver 130 watts-is weak.

130 watts into speakers with a sensitivity rating of 91 decibles can kill a lot of inner ear hairs, particularly when you consider a sub is handling the bass...

 

[AVRat]

Until you purchase a sub, the speakers should be set to large in the receiver's speaker setup menu.

 

[Midcow2]

SPL first, then maybe Power Amp.

so what should i do or get to use full potential of speakers ?

What do you mean by full potential?

First, I would set all of the speaker levels with a SPL (Sound Pressure Level) meter. Radio Shack makes a good digital one for $49.95
http://www.radioshack.com/product/index.jsp?productId=2103667
(this is probably all you need to do ) If your receiver doesn't have the capability to send out tones (I am pretty sure yours does) you can get an Avia 2 audio/video disk for about $30.

Second, If the speakers are not loud enough you can get a power amp and connect the prepro output to the power amp and the power amp to the speakers.

A good power amp is the Berhinger 2500 powe amp as low as $289.95
http://www.uniquesquared.com/servlet/the-87/Behringer-EuroPower-EP2500-Power/Detail

 

[MatthewB.]

The speakers you have are rated at 91db at one watt of power, which is actually quite loud, but for every three feet away the speakers you have to double the watts to get the same 91db, so say you sit 10 feet away, you would need about 4 watts to achieve 91db of sound.

99% of the time, the speakers only need less than 5 watts of power to run it's only during bass heavy action scenes that the speakers really need power. I have my BP7001sc hooked up to an outboard amp with a power usage gauge and I have yet to see that gauge get over 80 watts and I like it loud and sit 10 feet back. 130 watts is plenty of power and especially for DT speakers which are very efficient.

I would recommend adding a stereo power amp to drive your mains (which can be hooked up to your reciever) this letting the reciever have more power to drive the other speakers, but no you don't need a preamp.

 

[mtrycrafts]

The speakers you have are rated at 91db at one watt of power, which is actually quite loud, but for every three feet away the speakers you have to double the watts to get the same 91db, so say you sit 10 feet away, you would need about 4 watts to achieve 91db of sound.
.

Not quite correct

In free space, you need 6dB of power increase when you double the distance: 3 ft to 6 ft, 6 ft to 12 ft.
In room, an enclosed space, it is somewhat less, perhaps 4 dB of power.
Also, that 91 dB spl is most likely an anechoic chamber reading. Add 4 dB spl in room gain., so he has a 95 dB spl speaker. Yes, he has plenty of power

 

[mtrycrafts]

130 watts into speakers with a sensitivity rating of 91 decibles can kill a lot of inner ear hairs, particularly when you consider a sub is handling the bass...

Not to mention that those speakers are most likely 95 dB in room, 91 in a anechoic chamber.

 

[PENG]

What you need is power amps. 130 Watts is not much power. To get your money out of your speakers I would use 350 watt amps. Receiver 130 watts-is weak.

I thought 350W is weak too. To take care of the peaks, impedance dips,phase shifts, ability to crank the volume up and listen in a large room, he should try 2,000W first, and go from there.

 

[mtrycrafts]

I thought 350W is weak too. To take care of the peaks, impedance dips,phase shifts, ability to crank the volume up and listen in a large room, he should try 2,000W first, and go from there.

Yes, but then he needs to think about upgrading the branch circuit capacity also.

 

[PENG]

so what should i do or get to use full potential of speakers ?

Base on the impedance/phase shift info the Mythos 4 sytem is not that hard to drive. Especially if your system include the 1250W supercube subwoofer and crossover at 100 Hz per the system's specs.

http://www.hometheatermag.com/floorloudspeakers/1004deftech/index2.html
http://www.hometheatermag.com/floorloudspeakers/1004deftech/index1.html

You do have a very nice AV system. To get the full potential of the Mythos, you could work on the room acoustics side, tweak the receiver settings to your liking, take advantage of your PS3, and start enjoying your favorite movies in full HD. If your room is too large for the receiver to handle, then you have the option to add an external power amplifier. In that case, please let people know your room dimensions and acoustics condition and you will get more useful recommendations on how much power you may need to add.