 Rank: Advanced MemberReputation:  Medals:Groups: Listing Editor, Recording Mod, LS Specialists (Female) Joined: 7/29/2010(UTC)Posts: 644Location: Your-Very-HeartThanks: 827 timesWas thanked: 7800 time(s) in 252 post(s) | Chào em trai :)Let's start by looking at the specs of the system you acquired first - with the pertinent points highlighted. :)Quote:JBL MRX525 PA Passive Speaker:# System Type: Dual 15-inch two-way, bass-reflex# Frequency Range1 (-10 dB): 40 Hz - 20 kHz# Frequency Response1 (±3 dB): 57 Hz - 20 kHz# System Sensitivity (1w @ 1m): 100 dB SPL# Nominal Impedance: 4 ohms# Rated Maximum SPL: 129 dB SPL# Continuous (135 dB SPL Peak)# Power Rating (Continuous / Program / Peak): 800 W / 1600 W / 3200 W 1# Coverage Pattern: 70º x 70º nominal# LF Driver: 2 x JBL 265H 380 mm (15 in) Differential Drive® woofer# HF Driver: 1 x JBL 2408H 37.5 mm (1.5 in) annular polymer diaphragm, neodymium compression driver# Dimensions (H x W x D): 1240 mm x 535 mm x 460 mm (48.75 in x 21.0 in x 18.0 in)# Net Weight: 38.2 kg (84 lbs.) andQuote:Mackie PPM608 Powered Mixer:Distortion (THD + N)(1 kHz, 30 kHz bandwidth)Mic mono:<0.007% high gain<0.005% low gainLine mono: <0.005% low gainLine stereo <0.01% at main outMain mix output noise(1 kHz, 30 kHz bandwidth)Main mix level down, all channel levels down: –95 dBuMain mix level 0 dB, all channel levels down: –86 dBuMain mix level 0 dB, all channel levels 0 dB: –77 dBuFrequency Response(+0 dB/–3 dB)Mic mono input: < 10 Hz–80 kHzLine mono inputs: < 10 Hz–40 kHzLine stereo inputs: < 10 Hz–75 kHzEquivalent Input Noise (EIN)Mic input (20 Hz – 20 kHz)150 Ω termination: –128 dBuGainMic mono input: 45 dB high gain 25 dB low gainLine mono inputs: 20 dB high gain 0 dB low gainLine stereo inputs: 0 dBMaximum LevelsMic mono input: –25 dBu high gain –5 dBu low gainLine mono inputs: +21 dBu low gain +1 dBu high gainLine stereo inputs: +21 dBuPreamp main and monitor outputs: +21 dBuImpedancesMic mono input, balanced: 3.6 kΩ balancedLine mono input, balanced: 20 kΩ balancedLine mono input, Ch 5, 6 Hi-Z: 500 kΩ unbalancedMain and monitor preamp outputs: 240 Ω balanced 120 Ω unbalancedChannel EQHigh Shelving ±15 dB @ 12 kHzMid Peaking ±15 dB @ 2.5 kHzLow Shelving ±15 dB @ 80 Hz7-Band Graphic EQMain and Monitor 1: ±15 dB @ 125, 250, 500, 1k, 2k, 4k, and 8 kHzConnectionsMic input: XLR balancedLine mono input: 1/4" TRS balancedLine stereo input: 1/4" TRS unbalancedPreamp main outputs: 1/4" TRS balancedMonitor outputs: 1/4" TRS balancedInserts: 1/4" TRS unbalancedLoudspeaker outputs: 1/4" TS and Neutrik SpeakonLoudspeaker outputs(Both channels loaded and driven at 1 kHz.)Peak output power @ 4 ohms: 2 x 500 W peakAverage output power @ 4 ohms: 2 x 250 W rms, 1% THD 2 x 300 W rms, 3% THDAverage output power @ 8 ohms: 2 x 150 W rms, 1% THD 2 x 180 W rms, 3% THDRecommended load impedance: 4 – 8 Ω per sideRunning Man EffectsType: 32-bit internal processor, mono in, stereo outEffects presets: 24 Mackie-designed presetsPower Consumption120 VAC, 50/60 Hz, 680 wattsDimensions (H x W x D)12.3" x 19.3" x 11.4" (314 mm x 490 x 290)Weight24.5 lb (11.1 kg)Just by looking at the highlighted parts of both specs, at 4 Ohms, which is the nominal impedance of your speaker, its continuous power rating is specified to be 800W, and your powered mixer's average output power is just 250W RMS, :) I'd say you had to crank the volume of your powered mixer up really hard to have some loud sound and caused it to clip. :) Clipping will gradually jeopardize your speaker by overheating it. Such a "monster" PA pair of speakers costs you an arm and a leg and should not be played in such an "uncool" fashion. :)As the rule of thumb, certainly in my humble opinion, and as suggested by many so called audiophiles, the ratio between the alleged wattages of these two sound components should be in the range of 1.5 to 2.5 depending on each specific application. As for vocal and light music playback, it is recommended to be around 1.5 to 1.8. :) This is to give it some headroom for peak performance every now and then.Mackie is not bad but personally I am not fond of this brand for some subtle reasons, but definitely like JBL speaker lines. :) That "monster" pair of PA speakers is designed for big gigs, and certainly not suitable for home karaoke entertainment like your settings at all and costs too much, too. :) And for such a handsome amount of $ you threw in for that mediocre Shure wireless mic system, I would acquire a "decent" professional dynamic or condenser wired mic instead. :) The differences in term of audio appreciation will just amount to day and night. :)The art here is about knowledge, the game of matching to obtain the best within a certain budget and some research, if needed. :) Much more money thrown in and what is so called "đồ xịn" when being purchased "blindly" would only cause more harm than do you any good. :) As you've had to work since last summer to obtain these expensive things, in my humble opinion, it is just not worth it, my dear. :) Em nên do some research around và mua cái gì vừa túi tiền mà work well for you thôi cưng. :) Intrinsic value should triumph gaudy appearances. :)Btw, you should look for speakers w/ mid range tweeters and the like since human voices fall into this range; and hence, it would be suitable for vocal apps like karaoke jamming. :)Vài dòng cho câu hỏi của em. :) Hy vọng có thể giúp được em phần nào. :)
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System của em:Powered Mixer: http://www.americanmusic.../Item--i-MAC-PPM608-LISTUnpowered Loudspeakers: http://www.americanmusic.../Item--i-JBL-MRX525-LISTWireless Microphones: http://www.americanmusic...em--i-SHU-PG288PG58-LISTPS: Nếu được xin chỉ em cách chỉnh cái compressor và EQ nó như thế nào luôn, cám ơn rất nhiều. 
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