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这是设计者的介绍
讨论
The Nebula system was born in the Spring of 2002 out of a discussion on the Madisound Audio Discussion Board.星云系统是出生在2002年春季走出浅论madisound音频董事会讨论。 Peter Thomsen of Acoustic Reality, had presented a new series crossover he'd developed for use with the Vifa XT25 ring tweeter.彼得汤姆森声实际出发，提出了一系列新的交叉，他要开发利用与威发xt25环音单元。 I had been working with this tweeter for several months using simple series crossovers with no luck and was about to start trying higher order parallel topologies or give up on it all together.我一直工作与此音单元数个月，使用简单的一系列分频器没有运气和即将开始尝试高阶平行拓扑或放弃对所有在一起。 In the long discussion that developed, he suggested some parts values and a schematic for me to try and I built the circuit.在漫长的讨论中发展，他建议部分的价值观和示意图，我尝试和我建立了电路。 It was the best implementation of the XT25 I had tried to date.这是最好执行该xt25我曾试图日期。
There was upon extended listening, however, a bit of high frequency breakup at 5khz characterized by a glare to the sound caused by the Vifa PL18 woofer rolling off too shallow.有后，延长听，不过，有点高频率的解体在5khz的特点是眩光，以健全所带来的威发pl18低音单元滚动小康过于肤浅。 John Kreskovsky, the resident crossover guru at the MAD board, sent me an alternative circuit to try.约翰kreskovsky ，驻地交叉大师在疯狂的董事会，派我来替代电路的尝试。 It added a capacitor in series with the tweeter and a damping RC shunt across the woofer, resulting in what amounts to a second order series crossover.它增加了一个电容器在一系列与音单元和阻尼钢筋混凝土分流全国低音单元，导致在什么相当于一个二阶一系列交叉。 It yielded a second order rolloff for the tweeter and a damped second order rolloff (or third order if you think about it) for the woofer.它产生了二阶rolloff为音单元和阻尼二阶rolloff （或三阶，如果你认为它）为低音单元。 It also allowed a range of adjustment to taste in the level of the tweeter and worked well with slight errors in acoustic offset of the drivers, allowing for some leeway in tweeter mounting.它也允许了一系列调整口味，在水平的音单元和运作良好，轻微的错误声抵消的司机，让一些余地，在音单元安装。 I built John's suggested crossover and made adjustments by ear to C2, C3, R1 and R2 to come up with the final crossover after several days of tweaking. i建John的建议，交叉和作出调整，由入耳的C2 ，补体C3 ， R1和R2的来与最后交叉经过连续几天的调整。 The actual crossover frequency is 2.3khz, which is about the limit of the XT25 unless higher order slopes are used.实际的分频器频率是2.3khz ，这是有关限制的xt25除非高阶斜坡使用。
The enclosure is the simple to build Parts Express .55 ft^3 MDF box kit glued together with Titebond.圈地是简单的建设部分，表达0.55英尺^ 3中密度纤维板箱包胶连同titebond 。 The finish is two coats of Duraliner truckbed liner, rolled on with a 3" trim roller. The box is tuned with a 2"x7" PVC duct mounted on the back, 1/3 of the way down from the top. It's lined with a compressed layer of 2" thick pink fiberglass, available in 16"x48" packages from Home Depot.终点是两个大衣的duraliner truckbed班轮，推出关于与3 “修剪辊。方块是调谐与2 ” x7 “聚氯乙烯管安装在背部， 1 / 3的方式，从顶端，它的衬里压缩层2 “厚厚的粉红色玻璃纤维，可在16 ” x48 “套餐从Home Depot的。 Eggcrate foam can be used as well. eggcrate泡沫可以被用来作为良好。
The PL18 woofer will work in a variety of enclosures up to about 1 ft^3 but tuning should be adjusted if the box volume is altered.该pl18低音单元，将工作在不同的隔音罩，最多可有大约一英尺立方公尺，但调整应予以调整，如果箱体积是改变。 Don't make the baffle too wide or you'll throw off the baffle step compensation built into the circuit and will need to adjust L2.不使挡板过于广泛，或您摆脱困惑，加强补偿建成电路，并会需要调整的L2 。 The crossover will otherwise work fine but it's recommended that the resistor R1 be adjusted to your ear, and can be adjusted over a range of 5 ohms to 7.5 ohms.交叉的工作，否则将被罚款，但它的建议，电阻R1的予以调整，以您的耳朵，并且可以调整超过了一系列5欧姆至7.5欧姆。 A lower value will raise the level of the treble balance and a higher value will reduce the treble and you can feel free to adjust this to taste or use it as is.较低的价值会提高水平，高音平衡和更高的价值将减少高音及你可以感觉到自由调整，这品味，或者用它作为是。
Warning: If the value drops below 5 ohms the overall impedance of the system will drop to dangerous levels so use caution when adjusting this resistor. 警告：如果该值下降到低于5欧姆的整体阻抗系统将下降至危险水平，所以使用时要小心调整这个电阻。
Keep in mind that this is a series crossover and everything is in the actual signal path from positive in to amp return.请记住，这是一个一系列的交叉和一切是在实际的信号路径，从正面的，以安培的回报。 Because of this, all parts should be of excellent quality and all solder joints must be tight.正因为如此，各部分应该是优良的品质和所有焊点必须紧绌。 It is also highly recommended that all caps be bypassed with a good quality bypass cap such as the Audiocap Theta.它也强烈建议全部大写绕过一个良好的质量绕道上限如audiocap太塔。 There should also be no substitutes for the chokes unless EXACT values for inductance and DCR can be found.也应该有没有替代品，为扼流圈，除非精确值为电感的DCR和可以找到。 This is not an inexpensive or budget system but a pair can be built for around $500.这不是一个廉价或预算制度，但一对可建约500元。 All parts are available from Parts Express.所有零件可从零件的表达。
Nebula Crossover Schematic 星云交叉示意图
Assembled Crossover 组装交叉
Materials List (For One Speaker) 材料清单（一位发言者）
Part Description 部分描述 PE Part# 体育的一部分， ＃ Quantity 数量
.55 cu. 0.55立方米。 ft. "Knock-Down" MDF Enclosure英尺“连锁反应”中密度纤维板文 300-708 1
Vifa PL18 7" Woofer威发pl18 7 “低音单元 297-325 1
Vifa XT25 Tweeter威发xt25音单元 264-555 1
.15mH 14 ga Copper Foil Inductor 0.15晚上14遗传算法铜箔电感 266-702 1
2.2mH 14 ga Air Core Inductor 2.2mh 14遗传算法空芯电感 266-375 1
2 uF Dayton Poly Capacitor二脲醛代顿聚电容器 027-415 1
8.2 uF Dayton Poly Capacitor 8.2脲醛代顿聚电容器 027-426 1
12 uF Dayton Poly Capacitor 12用友代顿聚电容器 027-430 1
20 uF Dayton Poly Capacitor 20用友代顿聚电容器 027-436 1
.01 uF Theta By-Pass Cap (opt.) 0.01用友太塔由通上限（ opt. ） 027-700 3三
2.5 ohm Mills Resistor 2.5欧姆电阻米尔斯 005-2.5 1
12.5 ohm Mills Resistor 12.5欧姆电阻米尔斯 005-12.5 1
15 ohm Mills Resistor 15欧姆米尔斯电阻 005-15 1
2" by 7" Port 2 “ 7 ”港口 260-387 1
Crossover Notes: 交叉注释：
Parallel the 12.5 ohm and 15 ohm resistors to get the 6.8 ohm value I used.平行12.5欧姆和15欧姆的电阻器，以获得价值6.8欧姆我用。
Parallel the 2 uf and 20 uf caps to get the 22 uf value needed.平行二脲醛和20脲醛上限，以获得22用友的价值需要。
Your favorite brand of capacitor can be used instead of any of the above but NO electrolytics.您最喜爱的品牌电容可以用来代替上述任何一项，但没有electrolytics 。
Both drivers need to be wired with POSITIVE polarity per the schematic.两名司机须有线与积极的极性％的示意图。
Measurements: 测量：
Software Modelled Frequency Response软件为蓝本，频率响应
Software Modeled Impedance Profile软件模拟阻抗简介
Measurement as taken at DIY2002 Atlanta测量采取diy2002亚特兰大
Special Thanks To: 特别感谢：
Peter Thomsen of Acoustic Reality in Denmark for the initial crossover idea.彼得汤姆森声现实，在丹麦为初始交叉的想法。
John Kreskovsky for his assistance with the final crossover.约翰kreskovsky为他的协助与最后的交叉。
Dan Carroll for helping give this project a name.丹卡罗尔帮助给予这个项目的名称。
Andy Graddon of Australia for keeping series crossovers alive.安迪graddon ，澳大利亚饲养的一系列分频器活着。
Designed and Built by Ken Perkins 设计和建造，由肯帕金斯 |
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发表于 2008-12-29 13:17
楼主
