s**o
发帖数: 29 | 1 基本上，在无线通信中有两大类四种small-scale fading
1. Time dispersion due to "multipath delay spread"
a) flat fading
b) frequency selective fading
2. Frequency despersion due to "Doppler spread"
a) fast fading
b) slow fading
以上这两大类fading基本上是independent of one another
关于flat fading，通俗讲，就是传输信号的带宽小于信道的相干带宽，所以，信号
经过衰落信道后，在receiver处，信号的spectral characteristics依旧不变。
其对应的则是frequency selective fading，其信号的带宽大于信道的相干带宽，
所以，在RX处，接收信号在不同的频率其衰落特性也不同，即spectral characteristics
变了。
具体的，可以参考 Rappaport的"wireless com |
|
g*****e
发帖数: 87 | 2 Frequency allocation is almost different from country to country.
China mobile has both 900M and 1800M GSM sites.
Operator can do tighter frequency reuse pattern on 1800M/1900M and build
more sites to handle urban high density traffic area. Of course the
frequency penetration is weak on 1800M and 1900M and in door coverage is
poor.
700M/800M/900M are used to fill in the coverage holes and sometimes for
indoor coverage. |
|
z*****n
发帖数: 7639 | 3 They can be also mapped as frequency components
from fs/2 to fs, where fs is the sampling frequency.
So they generate alias to the frequencies in 0 to fs/2. |
|
p******h
发帖数: 8 | 4 Imagine a point on the unit circle, that is rotating counter-clockwise. The
location of the point as a complex number defines a (complex) signal. The
speed of the motion is the instantaneous frequency. If it is moving counter-
clockwise, the frequency is positive, and if it is moving clock wise, the
frequency is negative. The cosine signal is simply the real part of this
complex signal. |
|
g****t
发帖数: 31659 | 5 据我所知，这个说法是错误的。
例如电力火车，炼钢炉之类的几百安培以上的
大电流高功率产品中，频率调功和脉宽调功都有人用。
所以我看不能说谁比谁好。
用频率调功的方法而不是脉宽调功的方法，
提供大电流(几百安)的电路，网上都可以找到很多的。
"PFM效率高，但不能提供太大的电流"
这个说法有问题。
你看的手册很可能是可控硅时代的。那时候我记得上课讲的都是占空比啥的
的电路。频率调制在本科时候我都没听说过。
不过现如今开关原件的特点和那时候不同了。
多谢各位啊, 可怜俺以前还是学EE的。搞embedded system久了什么东西都丢了
loss.
dorminant at heavy loads, so high frequency PWM control is used. At light
loads, switching losses are dornimant, so to improve the efficiency and
decrease the switching frequency, PFM is always used.PFM frequency changes
wi |
|
a**i
发帖数: 419 | 6 不是特别懂。但我理解这是用bandpass filter的响应来代替spectral components。
理论上它们携带的信息是等效的。
32
to be spectral components!!! I didn't see an FFT between the filter bank and
the quantizer that transforms the time-domain samples to frequency domain.
Confused??
time-domain input samples transformed to frequency via the bandpass filters?
bandpass filters so they are transformed to the frequency domain by the MDCT |
|
r*********n
发帖数: 4553 | 7 现在蜂窝想要提高frequency reuse，每个基站都用全频段，以前用frequency
planning的来避免干扰的方法就失效了。这几十年蜂窝容量的提高，主要还是靠提高
frequency reuse，所以研究interference还是有实际意义的。 |
|
l*b
发帖数: 4369 | 8 谢谢提醒，我最近恰好也在学习PLL，主要是我感到我这个系统在补偿延迟之后，大概
还需要一个
frequency independent phase shifter来使得总的相移为pi，这个phase shifter就是
基于PLL
的。
正好请教：PLL能够在MHz区间实现线性frequency-to-voltage conversion么？我之前
看到NI有个
frequency-to-voltage converter (LM2917), 买来一试发现最高到150 kHz左右，之后
输出电压
就不再和频率成正比了。
西是 |
|
c*********6
发帖数: 858 | 9 小电容是RF滤波的，根据电容的resonant frequency来选择滤掉干扰，一般 18pF的
resonant frequency 在1.8G~2.2G, 33pF的在~900MHz,不同封装的resonant frequency
不一样，具体查电容datasheet.
还有靠近power pin的电容是用来提供transcient current，可以查看《高速数字信号
设计》中的有关PDN说明 |
|
b**********g
发帖数: 32 | 10 Depending on the frequency of the radio wave, having a conductor
tied to a "ground" may not be meaningful. The ground maybe a good
conductor for very low frequency electromagnetic field, but is a
poor conductor for higher frequency field (say a few hundreds
mega-hertz and above).
I wonder whether Dr. Fang and this whole thing is a publicity
stunt. This is not real science or engineering, this is marketing.
Ciao |
|
g*********n
发帖数: 808 | 11 GaAs vs. Si from wikipedia
Comparison with silicon
GaAs advantages
Some electronic properties of gallium arsenide are superior to those of
silicon. It has a higher saturated electron velocity and higher electron
mobility, allowing gallium arsenide transistors to function at frequencies
in excess of 250 GHz. Unlike silicon junctions, GaAs devices are relatively
insensitive to heat owing to their wider bandgap. Also, GaAs devices tend to
have less noise than silicon devices, especially at high fre... 阅读全帖 |
|
p*******g
发帖数: 809 | 12 站内联系
Sr. Staff, Staff Engineer – RFIC Design
Position Description
Join Samsung R&D organization based in Richardson, Texas, to champion
development of RFIC and sub-systems for next generation of mobile broadband
technology.
Responsibilities
• Interpret system level specs to circuit requirements for
transceiver blocks
• Design, simulate and characterize Radio Frequency Integrated
Circuits (RFICs)
• Conduct detailed circuit design at RF and above frequencies: up/
down-c... 阅读全帖 |
|
s*****d
发帖数: 2457 | 13 A startup in ZhangJiang is taking off, having an official launch date on Sep
-1-2015, for the high-speed SERDES market. Detailed job positions are as
below:
https://docs.google.com/document/d/1Rfy5CvXfMf-
4hBl4RxRofy4lcS2gYtDInl8hxA5Qkm0/edit?usp=sharing
======================================================================
ABC Microelectronics, Inc.
We are a Zhang-Jiang stealth-mode semiconductor startup, and have raised VC
money from the world’s leading venture capital firm for hardware. Our
r... 阅读全帖 |
|
h*********1
发帖数: 37 | 14 地点： 宾州匹兹堡
公司： 大型国际公司变频器市场及产品管理部门，业内领先
要求： 如下 （补充： 需要有毕业后5年以上实际产品生命周期管理工作经验, 工业变
频器经验, MBA preferred)
联系： 请发电邮: [email protected]
/* */
谢谢！
[email protected]
/* */----------
Responsibilities:
• For existing products, as Chairman of the Product Change Control
Board (CCB), implement changes related to DTC, quality, new options/features
and technical improvements in order to maintain the profitability and
market share of the product line.
• Participate in developing new produ... 阅读全帖 |
|
o******r
发帖数: 60 | 15 多相粘弹性材料分析。没有ansys手册，乱七八糟的翻了一下online help，不知道做的对
不对：
1。 prony series是不是只能用6个terms, 能多些吗？
2。 加载应变，比方说加载有某一频率的应变，是该用solution/analysis type/new
analysis 中选harmonic，然后在apply/displacement中定义amplitude,load step
opts/time/frequency中定义frequency。大家能不能据个具体的例子， 也算是sample
verification;
3。 为求得frequency domain response,是不是只能在不同的频率重复2。能不能用
spectrum analysis？ 假设可以用spectrum analysis,那么怎么样才能保证某一单独频率
作用时间足够长（sufficiently long so that the material's response reaches a
steady state).
以前没用过ansys，所以问得可能稀里糊涂的。牛人不要见怪
多些大 |
|
d**********e
发帖数: 72 | 16 SDN网上有主治医生撰长文说过：tunable diaphragm科技实际上会正确使用的医生不多
，并不很好。Welch-Allyn Harvey Elite受到高度评价
The tunable diaphragm will miss sounds at the extremes of the frequency, ie.
very low, and very high, and will not filter out unwanted frequencies.
Based on the research by Rappaport and Sprague in the '50s A tight diaphragm
is needed to detect high frequencies, and a deep bell with a sharp edge is
needed to detect low ones.
Other findings included dual lumen tubing at specific lengths of 14", 18",
or 25" (if m |
|
g***e
发帖数: 4074 | 17 不知道是不是指optical reflectivity的那个plasma edge，
在该edge以下的frequency不能在材料里传播，基本上都反射
回来，而在这个frequency之上的plasma反射率大大降低。
这个plasma edge 的frequency的平方可以表示为
w^2 ~ n/m*
（具体差个什么常数记不得了，总之就是正比于carrier
density n 而反比与 effective mass m*）
这个平方就直接反映drude weight。如果材料的n不变，则这
个反映effective mass的变化；反之如果说effective mass不
变，这个则反映carrier density的变化。但是在很多材料里，
由于carrier有不同种类，很难判断carrier density和
effective mass，这种情况下，谈论这个drude weight（w^2）
就比较有实际意义。
这种optical reflectivity测量，除了研究plasma edge
（drude weight）随温度变化的情况外，还经常研究它随磁场
的变化。
自 |
|
x*******n
发帖数: 185 | 18 again, read this book http://ab-initio.mit.edu/book/
you do not need to invent your own wheel. However, this code does not
include imagninary part of the dielectric functions. Depending on what
frequency range and what material you are considering, you need to do
different treatments. Say, for insulator and semiconductor, for frequency
below the band gap, the imag part is small, so you can use perturbation.
However, for metal or frequency above the band gap, you cannot use
perturbation. Anyway, |
|
a********0
发帖数: 34 | 19 Conceptually, viscosity and internal friction is the same thing. But you can
measure it by different means, resulting in different quantities and units.
Viscosity is a measure of stress at a certain strain rate. Glass's viscosity
may be very high but because it can still flow its viscosity is still
finite. You can directly measure viscosity based on its definition.
I don't know much about "phonon lifetime" but I guess you are talking about
some mechanical relaxation test, probably using acoustic... 阅读全帖 |
|
|
L*m
发帖数: 235 | 21 2015诺贝尔物理奖
获奖人：Arthur B McDonald、Takaaki Kajita
获奖领域：实验高能物理
获奖原因：发现了中微子震荡，并因此证明了中微子具有质量
相关文章
Measurement of the Rate of νe+d→p+p+e− Interactions Produced by B8
Solar Neutrinos at the Sudbury Neutrino Observatory
Q. R. Ahmad et al. (SNO Collaboration)
Phys. Rev. Lett. 87, 071301 – Published 25 July 2001
Direct Evidence for Neutrino Flavor Transformation from Neutral-Current
Interactions in the Sudbury Neutrino Observatory
Q. R. Ahmad et al. (SNO Collaboration)
Phys. Rev. Lett. 89, 011301 – ... 阅读全帖 |
|
l***y
发帖数: 1166 | 22 Components
组成部分
This theory is a logical extension of the rotating magnetic field model.
According to the Swami Vivekananda,
这个理论是旋转磁场模型的一个合理延伸。根据斯瓦米·维韦卡南达：
"the Vedantic Prana and Akasha and the Kalpas, which according to [Tesla was
] the only theories modern science can entertain [... he] thinks he can
demonstrate that mathematically that force and matter are reducible to
potential energy" (Grotz, 1997)
“根据（特斯拉说的），吠檀多的能量、阿卡萨和劫，只有现代科学的理论才能容纳（
……他），认为他可以用数学来论证，力和物质可约简成势能” (Grotz, 1997)
Tesla ele... 阅读全帖 |
|
s**a
发帖数: 178 | 23 Company: Leading Electronic Trading Firm
Loc: Jersey City, NJ
Position: Jr high-frequency trading strategist
Description:
The firm is looking for talented junior/mid-level quantitative strategists
to join our high-frequency electronic trading team. Ideal candidates will
have strong technical skills as well as experience in/enthusiasm to learn
electronic/high-frequency/stat arb trading. MS/PhD in EE/CS/Physics/Maths/
Computational Finance is preferred. And we need teamplayers who enjoy
solving ch |
|
G*****3
发帖数: 71 | 24 Majority of the prop trading house I know are high frequency based. Low
frequency is typically quite risky, as many of them hold over night or over
weekend position. Also majority of floor traders I know are high/med
frequency base.
I do think Sharpe ratio has to be calculated over a period of at least 12
months. Mine is calculated over the last year and a half and I still dont
think it is enough.
Btw, just to make it clear, only part of my portfolio suffers drawdown every
two months. The sharpe |
|
|
J******d
发帖数: 506 | 26 Ex-SocGen Trader Found Guilty of Stealing Secrets (Update1)
(Updates with sentencing date in second paragraph.)
By Patricia Hurtado and Bob Van Voris
Nov. 19 (Bloomberg) -- Former Societe Generale SA trader
Samarth Agrawal was found guilty of stealing trade secrets
related to the bank’s high-speed computer trading software.
A federal court jury in New York today delivered the
verdict at the end of a two-week trial. U.S. District Judge Jed
S. Rakoff set Agrawal’s sentencing for Fe... 阅读全帖 |
|
c*****n
发帖数: 83 | 27 在论坛上有很多地方需要包子，
可惜我现在才有 0.1 个伪币。
别人发包子时，由于我自己手慢总是领不到。
照这样的速度，猴年马月才有 10 个伪币。
所以在此用自己多年收藏的书籍向有包子的大牛们交换。
一个包子一本书。
有意者请发站内邮箱，注明要那些书，并附上邮箱地址，我收到包子后就发书。
以下是书籍目录：
active portfolio management.pdf
Advanced Analytical Models.pdf
Advanced Modelling in Finance Using Excel and VBA.pdf
Advances in Behavioral Finance II (Richard H. Thaler).pdf
Advances in Behavioral Finance Volume II.pdf
An Introduction to Copulas.pdf
An Introduction to High-Frequency Finance.djvu
An Introduction to High-Frequency Finance.pdf
A... 阅读全帖 |
|
j*******a
发帖数: 101 | 28 高频有这么不好吗？我是外行，但是我最近看了个书，high=frequency trading by
Irene Aldridge. 2010出版的，第三章说：According to the Technology and High-
Frequency Trading Survey conducted by FINalternatives.com, a leading hedge
fund publication,in June 2009, 90 percent of the 201 asset managers surveyed
thought that high-frequency trading had a bright future. In comparison,
only 50 percent believed that the investment management industry has
favorable prospects, and only 42 percent considered the U.S. economy as
having a positive ... 阅读全帖 |
|
s******r
发帖数: 324 | 29 for their size, high frequency really means good execution. It does not make
sense to trade in and out so rapidly. And they are not going to build
infrastructure as good as dedicated high frequency shop or paying people as
much since they use client's capital. I never heard any big shot in high
frequency went to work for two sigma. |
|
h***s
发帖数: 35 | 30 各位大牛，
有人知道这个公司吗？怎么样？
http://www.efinancialcareers.cn/jobs-%E4%B8%AD%E5%9B%BD-%E4%B8%
HFT/HF Statistic Arbirtrage Trader
薪资描述: competitive
工作地点: 上海, 上海市, 中国
工作经验: 1-3 年
公司名称: 易善资产管理有限公司
更新日期: 2015-01-16
1570
职位的浏览次数
Preston Investment Group is a hedge fund with head office in Shanghai and
trading crossing major markets. Its major trading strategies include
equities index future fully replicated arbitrages, CTA, statistical
arbitrages in equities and commodities markets, event-driven arbitrag... 阅读全帖 |
|
k*****a
发帖数: 13 | 31
介电常数is a function of frequency. Normally quated number only
is good for frequency less than khz. The visible light's electric
filed oscilates at GHz frequency.So you'll have a different number. |
|
a***n
发帖数: 148 | 32
this data is at light frequency
This is STATIC e,
in other words, this data is at about 0 frequency
square or square root?!
put the dielectric constant of light-frequency instead of that of STATIC e. |
|
m**********u
发帖数: 2 | 33 I am using SAS to deal with a huge data file with over 10 millions of
observations. “personid” is a variable. The structure of “personid” is
like, for example, xxxx2, xxxx2, xxxx2, xxxx3, xxx3, xxxx5, xxxx5, xxxx5,
xxxx6, xxxx7……., for a unique “personid”, there are several observations
as shown in the example above. I am trying to get subset that the frequency
of the unique “personid” has certain frequency, say, frequency=3, in the
case of example above, that means I want to obtain a subset: |
|
l******o
发帖数: 3764 | 34 100个snp, snp1-snp100,
每个snp有3种可能的genotype 比如AA AT TT
怎么样按genotype frequency high->low 给这三个基因型赋值 0 1 2？
补充一下 大概我说的太不清楚了 而且我忘记说明问的是SAS code 不好意思
我不是问怎么求每个SNP的allele frequency
而是想问有什么批量处理的方法能自动检测每个SNP的genotype frequency并且recode成0 1 2
感觉大家给我的建议都是手动一个个的操作啊
如果不是这个意思的话 还请高手们给点详细的建议
多谢多谢 |
|
m*****s
发帖数: 156 | 35 I am not sure what you want to do, but typical coding by allele frequency is
done like this. First calculate the allele frequencies of A,T and determine
the minor allele (frequency<0.5). Using the minor allele as reference
allele, you can code the three genotype by the count of the reference allele
. For example, if you have reference allele A, then code like this, AA->2,
AT->1, and TT->0 |
|
n*****t
发帖数: 41 | 36 谢谢，文件如下。我只要读取最后一个数，就是那个likelihood的数值。
MERLIN 1.1.2 - (c) 2000-2007 Goncalo Abecasis
References for this version of Merlin:
Abecasis et al (2002) Nat Gen 30:97-101 [original citation]
Fingerlin et al (2004) AJHG 74:432-43 [case selection for
association studies]
Abecasis and Wigginton (2005) AJHG 77:754-67 [ld modeling, parametric
analyses]
Fingerlin et al (2006) Gen Epidemiol 30:384-96 [sex-specific maps]
Chen and Abecasis (2007) AJHG 81:913-26 [qtl assoc... 阅读全帖 |
|
z**********i
发帖数: 88 | 37 I want to draw a certain sample from each stratum, or, layer. Below is the
expected size for each layer:
proc print data=size;run;
layer _NSIZE_
1 391
2 209
3 546
4 204
Below is the frequency of each stratum, or layer in the population.
proc freq data=pop;table layer;run;
Cumulative Cumulativ
layer Frequency Percent Frequency Percent
ƒƒƒƒƒƒƒƒƒƒƒƒ... 阅读全帖 |
|
g******2
发帖数: 234 | 38 I think usually they know the query accuracy through human evaluation, click
duration or some other method.
For frequency, you could calculate that based on 1. raw query (sounds like
lots of queries, but there are actually lots of high frequency queries) 2.
user cookie/ip (where you could obtain some useful information from the
users, like their location, frequency of using the product, and so on). Of
course there are lots of other ways to do it, but those are the simplest
ones I think. |
|
c***z
发帖数: 6348 | 39 【 以下文字转载自 DataSciences 讨论区 】
发信人: chaoz (晨钟暮鼓), 信区: DataSciences
标 题: [Data Science Project] Location data quality
发信站: BBS 未名空间站 (Wed Sep 24 14:35:40 2014, 美东)
Hi all,
This is my first project in the new company, and it is about third party
data quality. There is no gold standard for quality, but we know that
repetition of location in the dataset might imply bad quality, because in
this case the location might come from a centroid (e.g. a cell tower, rather
than a cell phone).
There is also no... 阅读全帖 |
|
s**********8
发帖数: 25265 | 40 A medical device is a product which is used for medical purposes in patients
, in diagnosis, therapy or surgery[citation needed]. Whereas medicinal
products (also called pharmaceuticals) achieve their principal action by
pharmacological, metabolic or immunological means. Medical devices act by
other means like physical, mechanical, physico-chemical or chemical means.
Medical devices are included in the category: Medical technology.
Medical devices include a wide range of products varying in comp... 阅读全帖 |
|
i*********5
发帖数: 19210 | 41 【 以下文字转载自 Running 讨论区 】
发信人: ironman2015 (1/2 ironman x3), 信区: Running
标 题: How to Run a Sub 3-Hour (or YOUR PR) Ironman Marathon
发信站: BBS 未名空间站 (Tue Nov 13 16:38:02 2012, 美东)
破三在本版已经开始普及开来了，但是在全程铁人赛里破三好像还没有人尝试过。Troy
教练的这篇文章就是讲他如何在４１岁时实现的这个目标。
http://www.coachtroy.com/public/605.cfm
How to Run a Sub 3-Hour (or YOUR PR) Ironman Marathon
Tips resulting from my Ironman AZ Experience
by Coach Troy Jacobson
What is your personal Mt. Everest? What big goal do you have on your 'bucket
list' that has b... 阅读全帖 |
|
i*********5
发帖数: 19210 | 42 【 以下文字转载自 Running 讨论区 】
发信人: ironman2015 (1/2 ironman x3), 信区: Running
标 题: How to Run a Sub 3-Hour (or YOUR PR) Ironman Marathon
发信站: BBS 未名空间站 (Tue Nov 13 16:38:02 2012, 美东)
破三在本版已经开始普及开来了，但是在全程铁人赛里破三好像还没有人尝试过。Troy
教练的这篇文章就是讲他如何在４１岁时实现的这个目标。
http://www.coachtroy.com/public/605.cfm
How to Run a Sub 3-Hour (or YOUR PR) Ironman Marathon
Tips resulting from my Ironman AZ Experience
by Coach Troy Jacobson
What is your personal Mt. Everest? What big goal do you have on your 'bucket
list' that has b... 阅读全帖 |
|
c***z
发帖数: 6348 | 43 Hi all,
This is my first project in the new company, and it is about third party
data quality. There is no gold standard for quality, but we know that
repetition of location in the dataset might imply bad quality, because in
this case the location might come from a centroid (e.g. a cell tower, rather
than a cell phone).
There is also no ground truth about which datasets are good, but we know
some good ones, particularly the channels we own.
We are exploring the relationship between data quality ... 阅读全帖 |
|
c***z
发帖数: 6348 | 44 Hi all,
This is my first project in the new company, and it is about third party
data quality. There is no gold standard for quality, but we know that
repetition of location in the dataset might imply bad quality, because in
this case the location might come from a centroid (e.g. a cell tower, rather
than a cell phone).
There is also no ground truth about which datasets are good, but we know
some good ones, particularly the channels we own.
We are exploring the relationship between data quality ... 阅读全帖 |
|
s*****r
发帖数: 11545 | 45 好象你说得对，俺盯着4G LTE Frequency看觉得频段不全，但是一看4G LTE Band 又觉
得挺全的，不知道两者区别在哪。难道不是一个BAnd对应一个frequency的么？
不过俺还是觉得不是双卡不爽。比不上 zte blade v8 pro.
还有， 这些都是翻新机。
4G LTE Band
1, 12, 13, 17, 2, 25, 26, 3, 38, 4, 41, 5, 66, 7, 8
4G LTE Frequency
1700, 1900, 2100, 850, 900
: 这个就是1806
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p*********e
发帖数: 32207 | 46 ☆─────────────────────────────────────☆
pandamalone (0000~史前圣灵猫熊) 于 (Wed Oct 21 02:30:51 2009, 美东) 提到:
【 以下文字转载自 Automobile 讨论区 】
发信人: doubleswords (=>>双剑>>: 姚明=宇宙第一中锋), 信区: Automobile
标 题: Lexus 终于推出 超级跑车了 LFA
发信站: BBS 未名空间站 (Wed Oct 21 01:58:45 2009, 美东)
好久不来这里逛了，今天看了一下东京的车展新闻
这车已经拖得太长时间，基本都失去关心兴趣了，全球 500 辆 $400K的价格就更没意
思了。也就下个月的 LA 车展上扫两眼了。只是希望这个发动机能用在普通 Toyota 上
面。整车里面不错，外面特别是前脸一般般。
* 4.8-liter 72-degree V10 putting out 560 hp at 8,700 RPM (that's 116.5
hp/liter) and 354 lb.-ft. o... 阅读全帖 |
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w*******y
发帖数: 60932 | 47 Comparison Specifications
* Power rating: 85W (340W peak)
* Impedance: 8 ohms
* Tweeter: 1" aluminum-dome compression driver
* 5" High-frequency Tractrix Horn (90 x 60)
* 6.5" magnetically shielded woofer
* 2050Hz crossover frequency
* Frequency response: 55Hz - 23kHz +/- 3dB
* Cabinet: black with titanium accents
* Enclosure type: bass-reflex via rear-firing port
Additional Specifications
* Sensitivity: 93.5dB @ 2.83 volts/1 meter
Dimensional Specificatio |
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w*******y
发帖数: 60932 | 48 These are incredible speakers for their price.
Link:
http://www.buy.com/pr/product.aspx?sku=212885777
Anyone looking for good home theatre speakers should give this one a try. It
is the lowest that I have seen in ages. Vanns had this for $499 which many
considered good.
Features
Video Features Tower speaker delivers incredibly accurate sound
Video Features Black ash finish fits any high-end audio, video system
Video Features Deep bass from two 6.5-inch Ribbed Elliptical Surround
Kevl... 阅读全帖 |
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w*******y
发帖数: 60932 | 49 Vann's has the Boston Acoustics Single 2-way black Classic series center-
channel speaker CS225CB (Black) today only for $59.88. Free shipping and no
tax for most.
Link:
http://www.vanns.com/shop/servlet/dealoftheday?a_c=showbestpric
Comparison Specifications
* Power rating: 15W - 175W recommended amplifier power
* Impedance: 8 ohms, nominal
* Tweeter: Single 1.0" Kortec soft-dome high-frequency driver
* Woofer: Dual 5.25" Deep Channel Design graphite-injected polymer
woofers
... 阅读全帖 |
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w*******y
发帖数: 60932 | 50 Vann's has the KEF 3-way black ash Q series center-channel loudspeaker IQ60C
Black Ash for $249.88 today only. Free shipping and no tax for most.
Link:
http://www.vanns.com/shop/servlet/item/features/548586020/kef-i
Comparison Specifications
Power rating: 15 - 150W
Input impedance: 8 ohms
Tweeter: One 0.75" aluminum tweeter in Uni-Q array with midrange driver
Midrange: One 5.25" driver in Uni-Q array with high-frequency tweeter
Woofer: Two 5.25" low-frequency drivers
Cabi... 阅读全帖 |
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