低音炮,力量决定一切!上图了

benly

LZ这胃口吊的够足啦[s:68] [s:68]   还是透露一些有用的信息吧，怕背QS头衔？那就PM（品牌、型号、价格、实物写真PP[s:97] ）

俄的神啊

交易区新帖推荐

倒相炮，慢

acme.fkz

楼主这样也没必要，交流么，器材交流很正常，可以隐藏价格信息，说说看具体的品牌型号

superwave

原帖由 小汤团 于 2007-9-29 19:18 发表
[s:97] [s:97] [s:97] 是他家的吗[s:14] [s:14] [s:14]

JBL等专业影院的低音并不适合家用，有源无源不重要，关键是影院的低音箱是镶嵌在银幕后的声学障板上，根本无须考虑矩形箱体发出的共振、驻波等于音响有害的噪音，它们全被隔绝了，家庭环境低音通常直接摆放在地上，有害驻波、箱体的共振声滚滚而来，箱体如不进行较大的改造，很难再家里使用，相信这位玩家也是与此箱搏斗了很久，才能获得较理想的声音。
但用于专业厅堂扩声的系列产品就不一样了，其低音箱的设计在于HIFI产品相比并无二致，而且还更适合长时间大声压工作。JBL 最新的PRX518S使用18寸低音，内置500W连续功率放大电路。绝对是家庭影院的低音箱理想选择。
PRX518S

Features:

JBL VGC™ (Vented Gap Cooled) woofer

Class-D, Crown® digital amplifier

DSP, input section with selectable
crossover, dynamic limiting, component
optimization, selectable polarity reverse

Professional XLR line and ¼"
Mic/Instrument inputs

Stereo input and Loop-Thru capability

Illuminated logo for clear Power-On
status

Top panel pole mount socket for
sub/satellite configuration

DuraFlex™ coated plywood construction

Wrap around heavy duty steel grille
provides protection without obstructing
performance.
Application:
Compact and powerful, the PRX518S
offers the performance of an 18"
subwoofer in a package not much larger
than a typical 15" sub. With a pole
receptacle (that accepts a SS3-BK) on the
top panel and integrated stereo pass-thru,
with selectable HP filter, this is the perfect
compliment to the PRX500 full-range
systems. Configured with a PRX512M or
PRX515; the result is a highly
transportable, high performance subsatellite
system. The addition of a polarity
reverse options further enables system
optimization.
The PRX518 is a high performance selfpowered
compact subwoofer system. The
PRX518S is comprised of a 2044E 460 mm
(18") VGC™ (Vented Gap Cooled) woofer
driven by a Crown International Class-D
digital power amplifier. A propriety DSP
chip is at the core of a fully featured input
section, providing user selectable crossover
functionality, polarity optimization,
protection, dynamic limiting and discrete
component optimization.
The enclosure is constructed of quality
plywood and coated in JBL’s rugged
DuraFlex™ finish. An integrated pole
mount on the top enables an easy
sub/satellite configuration. The CNCmachined
steel grille wraps around the
sides of the enclosure so there are no
protruding lips on the front of the box to
create acoustical interference. The grille is
also lined with an acoustically transparent
foam to provide additional driver
protection.
The amplifier input panel offers stereo
inputs with XLR or ¼ inch jack
compatibility. A user selectable crossover
ensures a smooth transition to full-range
system connected to the stereo outputs.
Signal present and overload lights indicate
the system status and assist in setting the
optimum level, via the level control knob.
Preliminary Specifications:
System Type: Self powered 18", two-way, bass-reflex
Frequency Range (-10 dB): 37 Hz – 140 Hz
Frequency Response (±3 dB): 52 Hz – 110 Hz
Crossover Modes: DSP controlled 48 dB filter slope
Crossover Frequency: 110 Hz
System Power Rating: 500 W continuous, 1000 W peak
LF Power amp: Class-D, 500 Watt (continuous) at driver impedance
Distortion: Less than 0.1% at rated power
Maximum SPL1: 129 dB SPL peak
Signal indicators: Overload: Red LED indicates input overload condition
Signal: Green LED indicates signal presents
Input sensitivity: –25 dBu to 0 dBu
Input Impedance: 34 K Ohms (balanced), 18 K Ohms (unbalanced)
Polarity: 0° or 180° phase shift
LF Driver: 1 x JBL 2044E 460 mm (18 in) woofer
Enclosure: Rectangular, 18 mm, plywood
Suspension / Mounting: 36 mm pole socket on top
Transport: 2 x die-cast handles with backing cup
Finish: Anthracite DuraFlex™ finish
Grille: Powder coated, Anthracite black, 18 gauge perforated steel
with acoustically transparent black foam backing.
Input Connectors: Balanced XLR / ¼ inch combo jack with XLR loop through.
(stereo)
Dimensions (H x W x D): 725 mm x 535 mm x 610 mm
(28.5 in x 21 in x 24 in)
Net Weight: 36 kg (79 lb)
1. Maximum Peak output measured with IEC pink noise at 1 meter in front of speaker baffle under free space
conditions. Measurement instrument set to peak hold. Speaker muted and released at full power, recording maximum
peak level.
JBL continually engages in research related to product improvement. Some materials, production methods and design
refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
reason, any current JBL product may differ in some respect from its published description, but will always equal or
exceed the original design specifications unless otherwise stated.
18" Self-Powered
Subwoofer System
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
© Copyright 2007 JBL Professional
A Harman International Company
SS PRX518S
CRP 5M
01/07

PRX518S 18" Self-Powered Subwoofer System
PRX518S
AMPLIFIER ONLY
0
OUT 180
IN
XOVER POLARITY
THIS DEVICE COMPLIES WITH
PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE
FOLLOWING CONDITIONS:
THIS DEVICE MAY NOT CAUSE
HARMFUL INTERFERENCE.
THIS DEVICE MUST ACCEPT ANY
INTERFERENCE THAT MAY
CAUSE UNDESIRED OPERATION.
1)
2)
JBL PROFESSIONAL
Northridge, CA. USA
LEFT RIGHT
Designed, Engineered and Assembled in U.S.A
Block Diagram
PRX518S Input Panel
dBSPL
60
70
80
90
100
110
20 Hz 50 100 200 500 1K 2K 5K 10K 20K
Frequency Response
DSP
Level
Overload
Invert Signal
Input 1
Output 1
Signal Present
Filters Insert
Input 2
High Pass
Filter
High Pass
Filter
Output 2
Sum
Sub
Power Amplifier

hazhangcheng

大口径的低音确实存在一个速度慢，下潜不够的问题。
其实低音炮12寸已经足够了，以前用的是JBL E250P，现在用的是DIY的炮。四个JBL 8400的单元，采取密闭箱设计。看《虎胆龙威4》中开头去暗杀电脑高手那段，阻击枪发出的低频让你明显感觉整个地板在动，而且一浪一浪的，人的精神高度紧张，结束后发现心跳加速N倍。《魔戒3》攻城开始的那段，双方互用投石机投石头，石头落地干净利索，低音收放快速。该有低音的时候汹涌而来，转瞬，又消失的无影无踪

atelas

交易区新帖推荐

pm我到底是什么怪物

TNF

JBL PRX518S 报2.8W,巨贵,哪位有便宜路子啊？

lmsd

原帖由 hazhangcheng 于 2007-12-18 11:35 发表
大口径的低音确实存在一个速度慢，下潜不够的问题。
其实低音炮12寸已经足够了，以前用的是JBL E250P，现在用的是DIY的炮。四个JBL 8400的单元，采取密闭箱设计。看《虎胆龙威4》中开头去暗杀电脑高手那段，阻击枪发 ...

放毒啊 引得我等新手又想做炮了 哈哈 能问问您的炮是如何设计的吗？（有图就爽了）

[ 本帖最后由 lmsd 于 2007-12-19 16:05 编辑 ]