Talk about the design of Jidian R801 matching speakers


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Debugging jidian R801 speaker still in the design, the use of the holidays, here to talk about some design considerations supporting the speaker of the Jidian R801. Jidian R801 Series Desktop Radio users on this altar, nearly 300 people (including 801-3D, and R803), is not a small group. 801 design, is designed in accordance with the “radio” and “sound” tilapia, to fully play a 801 series audio performance, the external must be a good speaker.

External speakers, there is planning the launch of 801 early, but the design of what a pair of speakers I have been still ringing in our thinking. The reason is to give you what kind of sound. On the market a variety of different performance, price and appearance vary, there are many selectable. If I do, to give 801 users with a what? Anyway, I would like a few points can be determined: one, the right; 2, sound good; 3, the appearance of coordination; the market to buy; design ideas.

1, right. Jidian R801 First, a radio, a very good performance of the human voice and music broadcasts. Second Jidian R801 or a level Hi-Fi amplifier, the characteristics of the sound tube amp should show the delicate and soft. Jidian R801 of the output power per channel 20W (RMS). Relative radio, power is quite small; sound, although not small, but not great. In order to ensure the overall effect, I determine the sensitivity of the speakers should be more than 88dB, so radio, sound the two can take into account; cabinet volume is not too big nor too small bookcase box or bookshelf box.

2, the sound must be good! To achieve Hi-Fi sound level, there must be a unique charm, and let the listener sitting in front of it, willing to enjoy it, there must be a long time reluctant to leave the feelings.

3, the appearance of coordination. Is to maintain a basic coordination with the appearance of the original 801 series. This is my hardest choice. Due to cost constraints, can not spend money in appearance. The original reference the tannoy design a pair of speaker processing costs about 2500 yuan (have to play a box back). In this regard, in order to ensure performance can only use a relatively simple style.

4, there can not be bought. If we just understood literally, it appears to be very easy to do. What I mean is: the market can buy the speakers are not on the cost-effective than my own design, sound, sound style, fit better.

5 design ideas. This is very important, and can reflect the value of our matching speakers. What is design thinking, where its meaning and value? In this regard, the following will focus on the pen and ink Laijiang Jiang.

Traditional or mainstream speakers roughly divided into two categories: 1, the inverted phase structure of the speakers (including the use of passive basin); 2, the closed structure of the speaker. Inverted relative to the speaker about 80% on the market, the closed structure of the speaker about 20%. Here there are a few questions to ask:
1 Why use speakers using speaker What are the advantages and disadvantages?
2, fell phase boxes role and what is the advantages and disadvantages;
What are the advantages and disadvantages of the closed chamber;
4, no inverted phase structure or enclosed structure, whether there are other options?

Let me explain a few issues.

We first look at the speakers (speaker) of the development process. The speaker of the invention in 1877, the previous studies and experiments, people invented a variety of speakers, but always can not get good bass.

There are two reasons, first, is itself the principle of not very good bass performance; also the main reason is that the speakers are two-sided voice, and RP, simply mount the speakers in a panel cancel each other out in the low frequency sound, so we can not hear good bass.

The following figure is a full-range speakers (Note not 801 matching speaker horn) box, measuring the frequency response curve, this curve can be seen, due to the existence of the phenomenon of acoustic short circuit start to fall below 500Hz out, feel the apparent low frequency of 100Hz or so, fell by more than 10dB:

Later, people invented the speaker is the speaker mounted in a box, so that the speakers on both sides of the sound completely separate, thus avoiding the offset each other in the low frequency sound, which has been the ideal bass, currently on the marketsell and some places with many of those who are in the box the speakers (which is the closed box).

The same speaker into the frequency response curve in the box:

By comparison, we can see the speaker load box after the sound of a short circuit disappears, becoming the “low frequency”

However, the speakers themselves there are inherent shortcomings of the box stained cabinets repeatedly reflected sound to the speaker the second sound modulation. Fitted with speakers to the speaker, we have solved the bass speaker, at the same time the speaker on the speaker’s voice also had a negative impact can not be avoided. Specific negative impact? Generally, there are the following:

First, the speaker back the sound to be controlled within the speaker, not spread out, only disappear through the speakers inside wall of the multiple reflections inside the air friction is natural attenuation, in the multiple reflection process will be repeated the role in on the back of the diaphragm of the speaker, thus affecting the normal sound of the diaphragm, resulting in the so-called multiple modulation of sound.

Take an extreme example, speakers receive a signal and sound, without any outside influence, the diaphragm should move 1 mm, but due to the sound of the speaker back in 1 second ago has not disappeared, the role of the speaker cone back, the diaphragm of the speaker it only moved 0.5 mm, so that the music we hear and correct.

Moreover, when we listen to a song, the speaker received always from the voice before, the sound of the music each time point are different, that is, the speaker received is also every every moment is not the same, the music that we have heard are untrue, are modulated front of the instrument. Although this part of the acoustic modulation of energy and amplifier of energy sent to a lot of long distances to listen to this sound modulation “will not significantly be felt to a close listen to this part of the” sound modulation of the voice will be listened to, thereby affecting the sound quality close to listen.

People in the design of the speakers would also like a way to solve this problem, such as the speaker to add sound-absorbing cotton, siphoning off the sound of the speaker back as far as possible in order to eliminate the vibration of sound modulation of the speaker, but this is only the high frequency part of the the sound is relatively effective, but no effect for the low-frequency sound.

The front speakers of the frequency corresponding to:

In the low frequency of the speakers within the corresponding:

Second, after each speaker made to have a fixed shape and size, will have a certain standing wave, only the standing wave frequency and intensity of the standing wave signal attenuation is very slow.

First loudspeaker diaphragm vibration of standing wave will have an impact on the standing wave will spread to our ears by the speaker of the wall is the music we hear a passive increase the sound, and finally, the standing wave will make the speaker generate noise.

The shape of the structure of the speaker, as well as increasing the intensity of the sound wall (such as thickening and wall thickness) to resolve the standing wave, but only the lower can not be completely eliminated. These standing waves will strengthen the second point mentioned above. Similarly, the noise generated due to standing waves in long-distance listening to feel little, but in close to listen to more obvious.

Third, each speaker is similar to an enclosed space, then the air in this enclosed space is equivalent to a spring, the diaphragm of the speaker connections in this spring, so the vibration is not a natural state of the diaphragm , there is always a spring no longer affect it. There are “sticky” as if the speaker cone of the air box to prevent it from moving forward or backward.

And this spring along C is not a constant, it does not comply with the Hooke’s law. When the spring is stretched (compressed) the displacement of the cis C is not the same. The diaphragm issued treble is a small displacement, but to issue low-frequency displacement, then this spring on the diaphragm is not the same.

Listening to a music certainly contains the sound signals of different frequencies of the bass midrange and treble, etc. This spring is different from the sound signals of different frequencies of the bass midrange and treble, etc., which allows us to listen to to music untrue. Secondly, this spring along and to the temperature and humidity, that is, when you listen to the same music, sunny and rainy, winter and summer.

Through the above analysis, we see that in solving the low-frequency speaker load box, but also many negative issues. The so-called “into the box, or failure box”. Relatively speaking, the box to solve the low-frequency and whether or not the benefits outweigh the negative things mentioned above. In other words, these negative things, though not what we need, but we have to accept and face.

Let us look at the speaker of the phase inversion structure. Inverted phase speaker is a special form of the above mentioned speakers, exactly, is a form of a low frequency do to enhance, that is, the role of the inverter box in addition to the useful box blocking the sound of the low-frequency short-circuit additionally a certain period of the low-frequency enhanced. We know that the inverter box is to use the principle of Trondheim Hz cavity to enhance bass. Elevated principle, interested relevant searches, not repeat them here.

We note that the “inverting” the structure of speakers, to enhance the low frequency of the volume is slightly larger, due to low frequency inverted phase structure strengthened at this time the low-frequency transmission was distant, so some “unnatural . ” That is we often have not listen to the music of melody from the alt, before they have the rhythm of the music – the low frequency “boom, boom” sound such feelings.

This is our radio enthusiasts often say “pound sound. Radio listening environment is not very far to listen to the distance, we do not want the music we listen to interfere with others. In other words, the inverted phase structure of the radio, even on the Hi-Fi stereo, not a particularly desirable structure.

Closed box structure, in fact, the previous analysis to the situation, the absence of the corresponding the Trondheim Hz cavity, the effect of its low frequency than the inverter box to enhance less, but less substantial vibration and enhance near distortion, Hi-Fi, in addition to the low frequency feeling a little less, the rest of the performance are better than the inverted phase structure of the speaker. Such a structure is the same used on the radio and sound performance but higher evaluation. Such as the Grundig S600 and S650. But the speaker of this structure, although not using an inverted phase structure of the speakers pound sound, but also our traditional “German” Radio as “bon bon sound.

Through the above analysis, the inverted phase structure of the speaker and sealed speaker, is not the ideal choice of Jidian R801 supporting speaker, then we choose what the structure of speakers good?

Used the excellent German machine you will be aware that these radio sound quality is very good, neither is the use of phase inversion structure, nor is it confined structure, instead of using the “semi-out-of-the-box” structure. Through the above analysis that, half out of the box structure is basically no (or only slightly) described above: the cabinets sound reflection repeatedly modulation of the speaker cone, cabinets standing wave on the impact of speaker cone there are “sticky” and so on and the air box on the cone.

It is this half out of the box structure of the radio box structure differences and system design, there are very good low frequency performance which is different from the style of inverted phase boxes and sealed box of low-frequency sound, this is reputation as a “bon bon sound. “Pompon sound” than those who pound the sound, “but a better listening experience.

It is this that we had this design in the design of the Jidian R801 speakers tend to consideration. Of course, we require the R801 Jidian matching speakers is not just listen to the radio, but the quality of the Hi-Fi speakers, and therefore can not copy the the original Jidian R801 or Jidian R801-3D design, can not be a repeat of the radio speaker. Therefore, from the perspective of the Hi-Fi audio to some considerations.

Through the above analysis that the cabinet and speaker determines the style of the low-frequency or low frequency sounds. High frequency style voice who decides? I can tell you, the high-frequency sound in the style and the cabinet structure adopted for a big relationship. Here is not to keep people guessing, experience tells us that high-frequency sound style is a leading role in starting from the midrange and treble units, followed by the amplifier and circuit. Therefore, amplifier and circuit protection, choice of tweeter is very important.

Test, we chose the Hi-fi circles, reputation and my own numerous experiments show the good gentleman treasure 9500, this unit was not a small number of million senior speakers are based on this unit. However, this speaker is too costly, the price is around 1400-1500! To this end, we also offer as an alternative, that Champollion’s a very good reputation alt speaker unit, the sound performance gap gentleman treasure, but the cost to meet the basic needs.

The following is a gentleman Bao 9500 frequency response curve:

This can be seen, the curve is very beautiful! (Black lines)

Following Champollion 301 frequency response curve:

Since the crossover point choose 3K, 301 Champollion 3K above, the curve is relatively flat.

Earlier he wrote: this amp to the sound of the people have a very good performance. The end of the human voice “sound” performance, it is mainly to reflect the Central woofer. Based on experience, the human voice to a very good performance, non-cone “speaker is none other than. Therefore, our bass speaker in principle, should I use paper materials to do the “drum of paper” (cone). In addition, there are some specific requirements to have “Pompon sound” speaker parameters; have a level of quality Hi-Fi speakers need to have sufficient dynamic range and output sound pressure level. With these principles, the choice of subwoofer basic also determined.

Style of sound to determine the structure of the cabinet to determine the shape of the box is largely determined, the speaker unit to determine the work of the following is the speaker unit parameters, the design and adjustment of the divider and started to dry!

 

 


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Price
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1 pcs sample
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