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10F/8424 & RS225-8 FAST Ref Monitor
10F/8424 & RS225-8 FAST Ref Monitor
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Old Today, 12:37 PM   #1571
jimk04 is online now jimk04  United Kingdom
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I have a pair of Seas L22 RNXP 8 ohm drivers. 88db @2.83v.

Do you think they would take the place of the RS225 satisfactorily with the crossover design on this thread?
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Old Today, 02:43 PM   #1572
xrk971 is offline xrk971  United States
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10F/8424 & RS225-8 FAST Ref Monitor
Quote:
Originally Posted by jimk04 View Post
I have a pair of Seas L22 RNXP 8 ohm drivers. 88db @2.83v.

Do you think they would take the place of the RS225 satisfactorily with the crossover design on this thread?
That's a very nice driver, and a first look, being aluminum 8in with a phase plug appears to resemble an RS225 in silver. Let's take a look at the frequency response before we even look at the TS parameters. Here is the SEAS:
Click the image to open in full size.

Note that there is a sharp drop off at 1000Hz, the XO is at about 800Hz to 900Hz (acoustically) on the 10F/RS225 and being a first order XO, needs a smooth wide bandwidth across the XO region. Also, that sharp peak at 4kHz would really need some serious notch filtering - but indicates this driver was not meant to operate with a low order XO into the mid-range.

Here is the frequency response for the RS225-8:
Click the image to open in full size.

Looking at the T/S parameters for the SEAS:
Click the image to open in full size.

Re=6.1ohms
Le=3.76mH
Qms=3.13
Qes=0.29
Vas=93L
fs=21Hz
mms=40g
Sd=220cm2
xmax=14mm(p-p) or 7mm (one-way)

For RS225-8:
Re=6.5ohms
Le=0.86mH
Qms=1.46
Qes=0.51
Vas=56.3L
fs=28.3Hz
mms=35.8g
Sd=214cm2
xmax=7mm (one way)

The main large differences are the Le, Vas, Qes, and Qms - basically a very different driver electro-mechanically. I don't think it will work with the same XO. However, if you measured it and used a simulator program, you could derive a new XO and perhaps move the XO point lower, to say 500Hz (acoustically) to stay farther from the 1000Hz drop-off.

So, this re-affirms an observation that I have had regarding the RS225-8: it is a unique driver that is unmatched at any price and by any brand.
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Last edited by xrk971; Today at 02:45 PM.
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Old Today, 03:40 PM   #1573
jimk04 is online now jimk04  United Kingdom
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Thankyou for that in-depth reply. I realise it is seldom the case of using an alternate driver for a given design, but like your first few observations....the Seas seemed to have a little bit in common with the RS!..

I'm not able to measure and XO design is very new to me and hard to get my head around so maybe this is a little too much for me at the moment!
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Old Today, 05:09 PM   #1574
perceval is offline perceval  Taiwan
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Never too late.

Get a mic, REW software and start measuring.

Then, have a look at XSim. It's a graphical XO design software and you will learn a lot by just playing with it.

Get you DIY skills up to the next level. It will open up a whole new world.
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Old Today, 05:16 PM   #1575
jimk04 is online now jimk04  United Kingdom
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It is on my list to be fair. Would love to be able to do more with this fantastic hobby.
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Old Today, 09:02 PM   #1576
wxn is offline wxn  Lithuania
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Varnish darkened the plywood a bit more than I anticipated. Oh well, I guess I'll just have to pretend it was intended
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Old Today, 09:16 PM   #1577
turk 182 is offline turk 182  Canada
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they look dead sexy!
no grill clips or hidden magnets for a grill?
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Old Today, 09:34 PM   #1578
xrk971 is offline xrk971  United States
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Nice work Wxn!
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