The AR-7 is a surprisingly small, two-way shelf speaker. It was designed for the lower-end market of AR´s marketing mix, but satisfied high quality standards. With less than 16 inch width, 10 inch height and a depth of 6 ¼ inch, the speaker is probably the smallest bookshelf speaker Acoustic Research had to offer at this time. It looks identically to the all typical AR vintage speakers, but is just significantly smaller.
The speaker is equipped with an 8 inch acoustic suspension woofer and 1 ¼ inch tweeter. Like most other AR-speakers it has a control to adjust the high frequency level. Each of the AR-7 has a weight of only 11 lbs or 5 kg.
I was personally not too impressed by this speaker at the beginning. I had high expectations after reading the company reviews which positioned this speaker as nearly equivalent to the high priced AR speakers. However, considering its price I have to admit that these speakers are a great value product. They are very clear and considering their size they have strong bass.
A realistic price for the AR-7 is very difficult to estimate as they became fairly rare. You can find them every now and then on ebay for about $200, but that is overpriced considering other AR speakers you can buy for nearly the same amount. I have read of many occasions in which these speakers were sold for little money at garage sales, even for as little as $2! Realistically, I would assume that it is fair to pay up to $80 for these speakers. If the condition is good, a little more might still be ok. Be aware that refoaming these speakers can be quite difficult, but considering their age often necessary. It can be a hassle to detach the grills without scratching or damaging the veneer or grill cloth!
(Depending on overall condition)
AR-7 Speaker Manual Manual provided by classicspeakerpages.net