Above 2000 hertz, a person cannot determine the apparent source by the difference in the signal arrival time – the intensity component of the binaural effect works there))) but let’s not talk about binaural stereo :)) now. There are a lot of drivers playing from 2000 hertz with a sensitivity of 96. After the next, or extraordinary collapse of the ruble in 2020, and sustainable development (and negative development is also development) of our economy, (for the first time in 15 years after 75GDSH-3-3) was forced to look around at the Russian production of speakers in order to make acoustics for his modest apartment. What is this speaker – let’s take a closer look. Name: Type: Vented Box Shape: Prism, square (optimum) Vb = 109.3 liters Fb = 40, Hz QL = 6.38 F3 = 50, Hz However, unlike the same BIG 301 (in some samples Qts 0.45), the power of the motor here and as a result, a hollow quality factor of 0.34 allows you to use both FI and make the box smaller than the equivalent volume. Of course I like the TAD TD4002 apart from the price. It is very good that NOEMA does not stand still and has released a very interesting speaker 50GDN-37. Even a set of blades was put to the traditional NOEM connectors))). The total volume of 144 liters is the price for a relatively low bass/light moving system and high sensitivity. New cast basket for the standard size 12" compared to 75GDSh (which is actually 13"), coil ventilation – holes under the centering washer and a very aesthetic appearance.
Below – we break up the phase-time component in the system by separating the emission centers at these frequencies. A sort of Siberian RED WOOFER ©))) looks really nice. Higher (and the narrowing of the DN begins from 1400 hertz approximately with the given dimensions of the diffuser), the narrowing of the radiation pattern will already be very noticeable. Now it’s time for the RF driver. I will not try the 1500-2500 hertz section by chance – more precisely, how it will turn out in reality. BL almost 12 for mms 37grams…. Subjectively, I like high-frequency drivers, either old-school with a phenolic diaphragm or trendy modern titanium / aluminum with a soft plastic surround like Celestion CDX1-1425, Radian 465pb or with them. In theory, the slabs on the impedance should be equalized by the PHI setting, but purely subjectively, I like to prop up the left hump a little higher – the bass turns out to be https://tonaton.ug/s_287-coriander tastier or something))) this is pure subjectivism. Height 600, width 500 and depth 450mm, with port PHI=80 percent of the area of ​​the speaker’s radiating membrane. Fill = normal No. of Vents = 2 Vent shape = https://jiji.com.et/power-equipments/lister round Vent ends = one flush Dv = 160, mm Lv = 501.9 mm Now we are trying to make a practical model in a box of 120 liters from a theoretical model, measure the frequency response and simulate a filter. Frequency response, well, about 40 cm from a box with a muzzle 60×60 cm in a cage 5 dB and not 10 like most firms. Right in general, my ideal The resonant frequency is 35 hertz and the total quality factor is 0.34. And you can solder on khaendovski)))). I wanted to choose the section "portable speakers, but stopped – not the first of April yet" The frame of the coil is also "old school" – a piece of paper. Unfortunately, at present, with the current https://tonaton.ug/s_294-blades dollar exchange rate, it has become very difficult to buy a pair of good imported speakers. And in reality, all this interacts very strongly with the room – it seems that according to measurements from small FI, there is bass, but the room interacts differently. The diameter of the ports is not accidental – JBL advised the diameter of the port to be at least 60 percent of the effective area of ​​​​the radiating surface of the woofer. The main thing is 300-2000 hertz from a single point source. It was not by chance that I immediately remembered TAD1102 – the T / C parameters are very similar. The only problem with such speakers is the large equivalent volume – the price paid for a soft suspension and a low resonant frequency, coupled with a slight movement. And YES – the sensitivity of the speaker is about 96 dB per watt … you can install it with a tube amplifier at home and there will be even more bass. Therefore, IMHO, a large port with such speakers is better despite the greater inertia of the entire system compared to small FI ports. This is a typical mid-bass speaker made in the best traditions of the old school of the 60-70s such as Goodmans, TAD and others like them – a very light moving system – the mass of the movement in the assembly with the coil, TSh and suspension is about 33 grams.
During this time I have been able to work with the really outstanding TAD1102 speakers and the equally legendary Telefunken Red nipple and the very nice BEAG HX301. To each his own.
BUT in my version – a contender for the tweeter link Radian 450 PB speaker in a wooden horn. BUT in this version we have 45 hertz.

Noema 50GDN-37 Do-it-yourself two-way acoustics.

Such a frequency response without sharp resonant bursts is quite simple for building a second-order filter. It was always possible to get a very pleasant bass and, what is very important, a very legible and detailed midbass on a single 12 inch speaker. Our Siberian response to Western sanctions. The horn MF-HF block is on top and a very interesting two-band is obtained.