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Experiences of and / or measurements Peerless SLS series?

DanielT

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Seems to be speaker element with good performance - price ratio.:)

You who have used these speaker elements, what are your experiences?

Are there any distortion measurements on any of the elements in the SLS series? I tried to find some but I did not find any.
 

digitalfrost

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I have built subwoofers with their 8" chassis. I also looked at lot of designs with their 10" and 12". They are good chassis, but their main problem is the high Qts due to the small mangets. So they need big enclosures. I built an isobaric design to keep the size down. Transmissionlines or dipoles are also possible.


This contains 3 TML subwoofers examples and detailed measurements for each of each chassis.
 
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DanielT

DanielT

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Thanks digitalfrost, interesting. I also observed that high Qts

3 TML subwoofers, looks exciting. Isobaric may also be of interest but I'm thinking of having some SLS in a three way speaker. Crossover around 300 Hz. Or together with Peerless tc9. It was just a thought that struck me a few days ago.



Saw this video about SLS 10. Seems ok in a sealed box of 30 liters, if you do not want to get down as deep as with vented. Hm, that might be something to try ...

Screenshot_2022-04-24_192046.jpg



Peerless SLS 10, 30 liter sealed box together with tc9, hm it might be a really nice budget speaker. Perhaps.:)
 
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digitalfrost

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I have no idea where he gets these enclosure sizes from. From the TSP I have you need 111l for the 10" to have box qts of 0.707. If you can live with 0.8 qtc it's still 60 liters. Bass-reflex is IMHO completely out of the picture with these.
 
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DanielT

DanielT

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So it was a little too good to be true, 30 liters of sealed that is. Hm, the element itself is affordable but the size of the box. Hm .... I have to think about that.

I will crank up some speaker simulation program. Which I will do but first a little general about SLS I thought. Hence this thread.:)
 
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DanielT

DanielT

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My guess is that XLS has become more popular and you can understand that when you see this picture SLS next to XLS.But there is a difference in price between them. That should be weighed in.

"For me, it is enough to compare physical facts to understand that these are two completely different elements; magnetic size / weight, basket, surround, power resistance, X-max, Fs. If you hold one in each hand at the same time, the difference is brutal. SLS is certainly a good bass, but as a subwoofer it did not work for me. Maybe if I had several elements, larger boxes or several subwoffers, but I do not have room for more than four (relatively small) subwoofers and then XLS simply works much better!"

65.jpg


 

jhaider

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In the mid-00s I installed the 8” SLS in the doors of my Miata. They worked well. I think they’re good value woofers, with good inductance control. More money from Peerless/Tymphany gets you more BL, longer throw, and nicer frames. But if they work for your application there’s nothing “wrong” with them unlike with most value-priced bass drivers.
 

Wolf

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I just finished a little 3-way with the 830945 5.25" SLS woofer in 6 ltrs with the SB SB15SFCR-00 5x8" PR. Tuned to 19.5Hz, yields an F3/10 of 52/38Hz anechoic. In room, they can dig a lot lower. Net sensitivity is only 82dB for the system, and the Zmin is 2.6 ohms at 150 with the 2.5mH/18AWG air-core applied. Save for the low Sensitivity and one low Z point, they seem to be okay to drive by the amps I have. Give them enough juice, and you'll be impressed!

I've heard the 8" (2x) in a dipolar 3-way, and they had a point where too much was asked of them in larger rooms. In a living room, I bet they'd be just fine.

The Tarkus (Paul's naked MDF version in fact) I heard at Iowa DIY 2008, and they really were capable of giving the biz!

I've not heard the 6.5" or 12", but the 12" is not that different in spec from the 10" so why spend more as a vented woofer.
 
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DanielT

DanielT

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Thank you for the input, that you share your experiences.:)

Hm, SLS 10 has 87.9 dB sensitivity. Two pieces connected to 4 Ohm give 93.9 dB. Not so bad. Then on a baffle, depending on its size, you lose X number of dB. Two 10-inch elements with an x-max of 8.3 mm. It should be pretty good bass. Disadvantage, relatively large speaker box plus 4 Ohm. I'm a little hesitant to 4 Ohm for the lowest bass frequencies (it can in practice dip below 4 Ohm). But of course there are amplifiers that can handle it.:)
 

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DanielT

DanielT

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DanielT

DanielT

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I've not heard the 6.5" or 12", but the 12" is not that different in spec from the 10" so why spend more as a vented woofer.
10 vs 12. Regarding bass. Air pump capacity. If I count inches. 12 inch woofer, area 113. 10 inch woofer = area 78
So therein lies a difference in the ability to pump bass.

So then you might think it's easy to choose the 12 inch element (the price is about the same). But then you come back to this with the size of the speaker box.

SLS 12:
QTS 0.54
VAS 132 L

SLS 10:
QTS 0.55
VAS 73 L

Edit
Speaking of size. I'm eager to buy two of these that a person sells used, at a good price ($ 230). But the size, ... but pretty masculine with two 18 inch elements in and of itself.:)

18 Sound had suggestions for 200 liter subwoofer boxes for them but no, it will be too big. See attached pictures.
 

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DanielT

DanielT

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I have found measurements on SLS 10!:)
That looks good! I have to say that. Especially in relation to the price/ costs of the SLS 10.

First the conclusions, I translated via Google Translate so it may contain some errors because I am not so good at German:

"The frequency response:

Due to the relatively high voice coil inductance, the sound pressure in the near field begins to drop slightly from 150 Hz. This can also be seen in the course of the angle-weighted sound pressure. This is irrelevant for a subwoofer, for a woofer in a 3-way system it partially compensates for the baffle step.
On axis, the frequency response of all 4 chassis runs at a distance of 20 cm from 240 to 1800 Hz in a corridor of only +/- 0.9 dB width - there is nothing to complain about! The membrane resonance at 2.5 kHz is only a maximum of 5 dB louder than the middle level in 3 of 4 drivers. Bundling sets in from 900 Hz, which increases only gently up to 1.2 kHz and only rises more sharply above that (although the increase is still very even).
Delayed ringing only occurs at the membrane resonance of 2.5 kHz.
All 4 drivers behave almost identically up to 1.8 kHz (the maximum deviation at a distance of 20 cm between 10 and 1800 Hz is only +0.63/-0.66 dB) - that's extremely good!

The distortion factor:

The "harmonic" distortion factor K2 runs linearly over almost the entire range of use and is - as usual - strongly dependent on the excitation level. In contrast, the higher distortion components up to an average sound pressure level of 95 dB hardly increase with the excitation level, only at 100 dB does a greater level influence become apparent.
At an average sound pressure level of 85 / 90 / 95 / 100 dB, K2 is on average 0.40 / 0.72 / 1.31 / 2.45% in the frequency range from 40 to 500 Hz. A mean value of 0.16 / 0.17 / 0.23 / 0.36% applies to K3 in this area.
The membrane resonance is below the range of maximum ear sensitivity and therefore the K3 distortion maximum does not coincide with the range of maximum sensitivity for K3 (see distortion factor - how much is too much?).
According to the article mentioned above, K2 would be inaudible in the level range under consideration. However, the K3 peak at 800 Hz would be well above the threshold of perception at all levels considered, but K3 remains inaudible up to 500 Hz. The K5 peak at 500 Hz is also audible at all levels considered up to 95 dB - although it is only approx. 0.13% at maximum.
Level linearity: The level linearity was determined for an excitation voltage of 2 to 20 volts, which corresponds to an average sound pressure level of 84 to 104 dB at a distance of 1 m! Between 50 and 2000 Hz, even at 20 volts (= +20 dB), only sporadically more than 0.5 dB dynamics fall by the wayside, between 200 and 600 Hz there are hardly any signs of dynamic compression even at 20 volts excitation level."


SLS10_1_Kx_20cm_85-100dB (1).gif

SLS10_1_SPLdeg (1).png

SLS10_1_CSD_20cm (1).png


An Peerless combo maybe?:)

SLS 10 plus:


Hm, I'm going to think about that. Crossover around or a little below 500 Hz maybe. :)
 
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