- #41 [fantsankong], 22-11-05 19:57barefoot 45同meyer ultra20 ab比較後,而家barefoot 要嚟睇片睇电視
- #42 [fantsankong], 22-11-05 20:02ultra20要嚟聽歌,人声真係一流
- #43 [richmond168], 22-11-05 20:06#40 Buddy 兄,我而家也未有Meyer , 之前玩過唔少牌子Monitor, Genelec, Adam, Yamaha 10M Studio, NS-40M, JBL 43xx 幾個model, 仲有TAD, ME (也是德國的)其實我也借過KS Digital 喇叭兩個禮拜,型號唔記得,聲音可以的,不過印象中真係唔係咁爆得。
純粹個人感覺,德國喇叭聲音比較偏冷,有啲機械化。
至於Class A, Class A/B or D, 講真我之前一向都係Class A Fans, 配無源喇叭一定用Class A後級…
不過自從不少高班器材、例如Jeff Roland, 也出Class D amp 之後,加上以前Krell 肥Dan, 近年也說好的設計唔一定係 Class A, 另外FM Acoustics (我也玩過專業版600A, 801, 及民用版711三部FM)也不是Class A, 所以我早幾年都開始留意吓其他 Class A/B 及Class D的Amp. 近幾年真的發覺,用其他Class A/B, 甚至Class D 的也可以很好聲啊!所以都係果句,耳聽為實,聽聲收貨,不要因為Amp 係Class 乜乜,先入為主以為唔掂,咁你可能會損失了唔少找到好東西的機會。(以前我就係先入為主,haha)
最後修改時間: 2022-11-05 20:31:46 -
- #44 [abcde], 22-11-06 01:25How about Dutch & Dutch 8c?
30-20KHz, +/- 1 dB. - #45 [Nikkor], 22-11-06 05:03哦, 覺得細, 我朋友話佢大師兄阿John之前係學呢位袴田剛史, 袴田先生係日本Victor Studio裡mastering專屬部門Flairg工作. 2007年起負責高音質唱片系列 : K2HD, 已經處理過超過一千張以上的專輯. 袴田先生做mastering都係用德國系active monitor, 大嘅有Musikelectornic Geithain RL 901K, 小嘅有KS Digital C5-Reference, 另外有對micro, JVC嘅Wood Cone EX-A3. 不過3對嘅SPL都去唔到130db要求, 唔爆得, 即係唔合格, 入唔到流.
最後修改時間: 2022-11-06 05:29:49 - #46 [Nikkor], 22-11-06 05:24
[#44]
abcde師兄, Dutch & Dutch 8c有唔明嘅地方建議去問Kent Poon, 有問必答. +/- 1 dB嘅performance, 4個單元加行DSP, 應該冇問題, John Atkinson都講過, 可以去睇番. Kent Poon做mastering用個對Grimm Audio都係行DSP.
Have a nice Sunday with wonderful music. - #47 [Com-buddy], 22-11-06 16:55Kent Poon Sir, 為人風趣,音響及音樂皆精,非常佩服。
剛在外地“甜水"網看見下文:
“This dual-pole-mount, powered PA system includes two ULTRA-X20 loudspeakers, which are renowned for their ......."
明示這並非鑑聽用途, 難怪用 crest ratio 做 Spec
最後修改時間: 2022-11-06 16:57:00 - #48 [Com-buddy], 22-11-06 17:02ME Geithian 心儀已久,是時候找找了
- #49 [abcde], 22-11-07 00:20#46, Thanks C Hing.
- #50 [Nikkor], 22-11-07 02:26#49
abcde師兄, 不用客氣, 多年前睇JA寫過, 話睇frequency response, 最重要係睇+/-幾多db, 當年製造一對喇叭能夠達到20-20,000 Hz(+/-1dB)係相當困難, 現在行digital有DSP幫助就容易DD. Have a nice night with fine music.
#47
Com-buddy師兄, 學養過人, 一語中的, 佩服.
Kent Poon Sir, 為人風趣,音響及音樂皆精,非常佩服。x2 我同Kent係同鄉加多幾分, 咔咔咔.
我第一次認識Kent Poon係多年前, 當時Kent係Radar嘅dCS consultant, 同場仲有the late Mike Story, 我向兩位請教master clock嘅應用. - #51 [richmond168], 22-11-07 04:14#47: 你講什麼呀?Crest Ratio? 未聽過喎⋯⋯你係唔係想講Crest Factor呀?呢個我就聽過。
Crest Factor 唔係一種指定”非Monitor” 用的spec, 佢係指訊號最高峰值/RMS 的比例,能應付越高Crest Factor 而不失真的是更好嘅器材,包括喇叭。所以什麼器材也可以用到,唔同嘅訊號有唔同嘅Crest factor 數值…不過有幾多音響工廠會話俾你聽佢用什麼數值crest factor 嘅訊號去測試佢嘅器材呢?
唔識crest factor冇問題,睇吓下面Wiki 部份資訊:
Crest factor is a parameter of a waveform, such as alternating current or sound, showing the ratio of peak values to the effective value. In other words, crest factor indicates how extreme the peaks are in a waveform. Crest factor 1 indicates no peaks, such as direct current or a square wave. Higher crest factors indicate peaks, for example sound waves tend to have high crest factors.
Crest factor is the peak amplitude of the waveform divided by the RMS value of the waveform.
The peak-to-average power ratio (PAPR) is the peak amplitude squared (giving the peak power) divided by the RMS value squared (giving the average power).[1] It is the square of the crest factor.
When expressed in decibels, crest factor and PAPR are equivalent, due to the way decibels are calculated for power ratios vs amplitude ratios.
Crest factor and PAPR are therefore dimensionless quantities. While the crest factor is defined as a positive real number, in commercial products it is also commonly stated as the ratio of two whole numbers, e.g., 2:1. The PAPR is most used in signal processing applications. As it is a power ratio, it is normally expressed in decibels (dB). The crest factor of the test signal is a fairly important issue in loudspeaker testing standards; in this context it is usually expressed in dB.[2][3][4]
The minimum possible crest factor is 1, 1:1 or 0 dB.
any given linear amplifier has some "peak output power"—some maximum possible instantaneous peak amplitude it can support and still stay in the linear range;
Applications
Edit
* Electrical engineering — for describing the quality of an AC power waveform
* Vibration analysis — for estimating the amount of impact wear in a bearing[20]
* Radio and audio electronics — for estimating the headroom required in a signal chain[21][22]
* Music has a widely varying crest factor. Typical values for a processed mix are around 4–8 (which corresponds to 12–18 dB of headroom, usually involving audio level compression), and 8–10 for an unprocessed recording (18–20 dB).[23][24][25][26]
(The following is my own Summary)
* To sum up, Due to limited max possible output, people may need to reduce the crest factor of a signal to keep the audio system to stay within the linear range. The ability to handle a Higher crest factor is then always desired and tells how capable a system is.
* This applies to all audio systems including the speaker - no matter if it is for monitoring or not.
* Not all manufacturers are willing to show the crest factor of the test signal they use which shows their max capabilities, or, weaknesses.
最後修改時間: 2022-11-07 04:18:24 - #52 [Nikkor], 22-12-04 13:38
REF : [#47]
Com-buddy師兄,
師兄學養過人, 一語中的, 多謝點出原來係PA system用嘅PA speaker. 我去"甜水"網望下, 點解個power input唔係HiFi/Recording Studio機器用嘅IEC plug, 而且重有多個power output, 好奇心下, 做D功課, 哈哈哈, 一日PA, 一世PA, 用漂白水都漂唔走嘅PA味道. 個對裝嘅power input/output plug係PA system用嘅powerCON plug, 因為PA system機器又多又雜又似火車一卡鏈接一卡, 所以PA system用powerCON plug, 有lock又安全D. 多謝Com-buddy師兄, 又學多D嘢. 一日PA, 一世PA, 世世代代PA, 用漂白水都漂唔走嘅PA味道, 哈哈哈!
PowerCON plug其實好專業, 乜PA system機器都用得, 應該考慮一下把家裡HiFi/電器全部換powerCON plug, 咔咔咔!
最後修改時間: 2022-12-04 13:40:38 - #53 [com-buddy], 22-12-05 23:45Nikkor 兄著实折剎小弟了. 本人绝非看不起PA産品,相反當中有不少有實力設計,可作家庭用途. 正如吉普車也有人當房車用,但宣傳資料總要老實報述吧. Neutrik 的 Speak-On 和 Power On socket 在專業 PA 界早巳風行標準化, 安全方便化算耐用兼備, 手上有些輸出超過400瓦的功放出廠都巳配上 Speak On 座.
- #54 [Nikkor], 22-12-05 23:58謝謝Com-buddy兄指導教誨, 對, 做人做事都應以老實為本.
Have a nice night. - #55 [abcde], 22-12-06 00:58The US power conditioner, Audience, is also using Neutrik Power On socket, it is reliable in connection.
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